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Journal of Drainage and Irrigation Machinery Engin
 
2023 Vol.41 Issue.1
Published 2023-01-25
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2023 Vol. 41 (1): 0- [Abstract] ( 16 ) [HTML 1KB] [ PDF 19592KB] ( 635 )
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2023 Vol. 41 (1): 0- [Abstract] ( 17 ) [HTML 1KB] [ PDF 972KB] ( 245 )
1 Effect of annular jetting hole specific area on performance of vertical self-priming pump
CHENG Xiaorui,XIONG Bo*,LIU Mingjian,WANG Juanjuan
To study the influence of annular drainage injection jet on performance of vertical self-priming pump, the vertical self-priming pump 350WFB-1200-50 was used as the research object, and the full flow field of vertical self-priming pump under different annular jetting hole specific areas was calculated using RNG k-ε turbulence model and the Zwart cavitation model. The research results show that the impeller inlet pressure and the cavitation performance of pump can be significantly improved by annular drainage injection jet. However, the NPSHR is increased resulted from an increase of impeller inlet speed which cased by the drainage flow, then the cavitation performance of pump deteriorated. Finally, the cavitation performance of pump increases first and then worse under the combined action of the two. As the specific area k of annular jetting hole increases, the volume loss of pump is increased resulted from an increase of leakage at the outlet of volute more vortexes at the outlet of volute and the impeller inlet streamline is crowded resulted from the jetting flow, which has a great influence on the mainstream, then the head and efficiency of pump declined. The vertical self-primimg pump net positive suction head reaches the minimum when the specific area k of annular jetting hole is 0.25, compared with the original model, the vertical self-primimg pump net positive suction head is reduced by 23%, the head is reduced by 2.1% and the efficiency is reduced by 2.5%. The research results can provide some reference for the optimization design of vertical self-priming pump.
2023 Vol. 41 (1): 1-7 [Abstract] ( 23 ) [HTML 1KB] [ PDF 3647KB] ( 306 )
8 Identification method for centrifugal pump working condition based on improved binary tree support vector machine
CHEN Daibing,YUAN Shouqi*,PEI Ji,WANG Wenjie
In order to ensure the safe and efficient operation of centrifugal pumps, it is necessary to identify the operating conditions of centrifugal pumps. Firstly, three feature extraction methods of vibration signals, empirical mode decomposition, ensemble empirical mode decomposition and complementary ensemble empirical mode decomposition, were compared and studied by using test functions. The feature data of vibration signals of centrifugal pumps under different operating conditions were extracted based on the feature extraction method with optimal performance. Then, the support vector machine model was improved, and a binary tree support vector machine model optimized by k-means clustering algorithm was proposed. The improved model was applied to the identification of four different operating conditions of centrifugal pumps. At the same time, the other two multi-classification support vector machine models were used as comparison. The results show that among the three special extraction me-thods, the complementary ensemble empirical mode decomposition has no modal aliasing sign, less noise interference and better performance. The classification accuracy of the improved support binary tree vector machine model can reach 82.17%, which has a good classification effect on the four working conditions designed. The improved support binary tree vector machine model has simple structure, short training time, good real-time performance and better comprehensive performance than the other two models.
2023 Vol. 41 (1): 8-15 [Abstract] ( 24 ) [HTML 1KB] [ PDF 2335KB] ( 243 )
16 Effect of rotating speed on water-ring flow of pump-turbine in pressurized water phase modulation operation
CHEN Shuai,CHEN Zhenmu,ZHANG Wenwu,LU Jiaxing,ZHU Baoshan*
In order to study the influence of the rotational speed of the pump-turbine on the flow cha-racteristics of water-ring under the phase modulation condition, the ANSYS CFX software is used to simulate the unsteady flow characteristics of water-ring with medium-specific speed pump-turbine. The pressure fluctuation and internal flow characteristics of the water-ring are analyzed with rotation speed of 600, 800, 1 000 and 1 050 r/min. The results show that the thickness of the water-ring in the vaneless zone is closely related to the rotating speed. The larger the rotating speed is, the large average radius of the free surface in the water-ring is, and the thinner the thickness of the water ring is. The composition pressure fluctuation frequency in the vaneless zone were the same at different rotational speeds, and the dominate frequency is 7fn, which caused by the interaction between rotor and stator. The amplitude of the dominate frequency increases with the increase of the rotating speed as well. The intensity of pressure fluctuation is almost the same in the circumferential direction. However, the pressure fluctuation becomes smaller as the location closer to the runner in the radial direction. There is an obvious gas-liquid interface near the runner outlet and the runner passage filled with air, which shows that the water-ring has a good effect on gas sealing. The research results can provide some reference for the operation of pump turbine under phase regulation condition.
2023 Vol. 41 (1): 16-21 [Abstract] ( 31 ) [HTML 1KB] [ PDF 5679KB] ( 358 )
22 Numerical simulation of stress and mode of rotor system of high-temperature molten-salt pump
WANG Zichao,ZHANG Desheng*,JIN Yongxin,GAO Xiongfa,DONG Yaguang
In order to improve the operational reliability of high-temperature multi-stage molten salt pumpof the solar thermal power system, the structural stress of molten salt pump at extreme high temperature condition is analyzed systematically based on the fluid-solid-thermal multi-field coupling theory. The model characteristics of high-temperature rotor system under the action of without and with prestressed, which contains fluid pressure, inertial force and temperature load, are compared and analyzed respectively. The results show that the density and viscosity of molten salt medium have little effect on the external characteristics, and the water test results can be used as a reference for the ope-ration performance of high temperature molten salt. The temperature of the impellers rises with the increase of the impeller stages. The temperature change of the impeller is distributed symmetrically in the center. The maximum temperature of the impeller increases as the flow rate decreases. The main stress on the impeller comes from the fluid pressure and inertial force load, as well as the distribution is symmetrical. There is stress concentration at the intersection area of front and rear cover plate and blade. The stress at the trailing edge of the blade rises significantly to over 60.000 MPa. Temperature is the main factor of impeller deformation. Impeller deformation increases with temperature rise. The natural frequency of the rotor structure with prestressing is higher than that without prestressing, whose magnitude of the rise is 109%-498%, and the amplitude change of each step is not obvious. The critical speed of the molten salt pump deviates from the rated speed of the pump, which avoids the resonance of the rotor system during operation. The research results can provide a theoretical basis for the design and development of high temperature molten salt pump.
2023 Vol. 41 (1): 22-31 [Abstract] ( 20 ) [HTML 1KB] [ PDF 15828KB] ( 232 )
32 Analysis of sulfate resistance of silica fume lightweight aggregate concrete under dry-wet cycle
ZHANG Jiahao,WANG Hailong*,LIU Simeng,YANG Hong,MA Kuaile
In order to explore the sulfate erosion mechanism of silica fume lightweight aggregate concrete under dry-wet cycle conditions, pumice stone in Inner Mongolia and Linger County was selected to replace 6% cement with silicon powder. Through using NMR technology, the pore change law of silica fume lightweight aggregate concrete under the coupling effect of sulfate erosion and dry wet cycle was analyzed. The pore change law of concrete under the combined action of sulfate erosion and dry-wet cycles, and the change of concrete microscopic morphology was observed by scanning electron microscope technology, and the phase analysis was carried out by XRD. The studies results show that: during the sulfate erosion process, the mass loss rate of silica fume group and ordinary group have the same change, and the inflection point appears at 60 times. After 90 cycles, the maximum pore of silica fume group is reduced by 56.5%, and the maximum pore of ordinary group is reduced by 18.8%, which proves that the incorporation of silica fume can effectively refine the size. The harmless pores of the two groups of concrete at the beginning of the cycle are less than 10%, and there is a tendency of small pores to develop into large pores during the cycle. The gypsum and AFt generated in the pores can be seen in the SEM scanning electron microscope photos, and the slender cracks inside the concrete after 90 cycles can be observed. After 90 cycles, two groups of concretes have more CaSO4·2H2O diffraction peaks, and the products are mostly sulfate and carbonate crystal hydrates. The research results can provide a theoretical reference for the engineering construction of hydraulic structures in a sulfate environment.
2023 Vol. 41 (1): 32-37 [Abstract] ( 21 ) [HTML 1KB] [ PDF 2638KB] ( 261 )
38 Experimental study on hydraulic performance of subsurface drainage geotextile envelope in Yangzhou Yanyun Irrigation District
ZHANG Dawei,JIA Zhonghua*,HE Yuanchun,ZHANG Yu,LUO Wan
The construction of farmland subsurface pipe drainage system is one of the effective measures to improve the efficiency of agricultural mechanization operations. When the geotextile is used as an envelope material for the subsurface drainage pipe, it needs to have a good permeability and anti-blocking ability. In this paper, taking the irrigation area along the Yangzhou section as an example, in view of the high content of powder particles in the local soil, the actual problem of difficult screening of the geotextile envelope material, referring to the relevant technical guidelines, two kinds of geotextiles with different opening ratios and thicknesses were selected for hydraulic permeability tests, and compared with traditional river sand filter materials, so as to the geotextile envelope materials suitable for the local soil were selected. The research results show that the water permeability of the two selected geotextiles is quite different. The geotextile A with a larger thickness(0.41 mm)and a smaller pore size(180 μm)has better water permeability, and the permeability coefficient is 54.1% of the initial value, which is higher than 46.1% of the river sand filter layer. The permeability coefficient of geotextile B with a thickness of 0.35 mm and a pore size 227 μm is only 30.2% of the initial value. Compared with geotextile B, geotextile A has better anti clogging ability, and the silting rate after long-term use is 16% lower than geotextile B. Through the analysis of the low permeability filter cake formed on the geotextile surface, it is found that not only the geotextile B itself has a large degree of silting, but also the filter cake formed on its surface is relatively dense, which is the direct reason that affects the permeability of the geotextile.
2023 Vol. 41 (1): 38-43 [Abstract] ( 15 ) [HTML 1KB] [ PDF 5677KB] ( 284 )
44 Analysis of downstream downstream flow characteristics of cross- cylinder structure in horizontal pressurized straight pipeline
LU Yifan,LI Yongye,ZHAO Yiming,SONG Xiaoteng,QIANG Yipeng,YUAN Yuan,CHEN Run
In order to study the flow separation phenomenon and wake vortex phenomenon in the downstream of the pipe system when the pipe car, as a kind of obtuse cylindrical structure with intersection flow field. The flow field characteristics of the downstream of the pipe system are studied by combining theoretical analysis and numerical simulation. The LES-WALE turbulence model is used in the numerical simulation, and the comparison between the results and the physical test proves the feasibility of the numerical simulation. The numerical simulation results are analyzed theoretically. Firstly, the velocity distribution in the flow field behind the flow separation cross-cylinder system is divided into two parts: the low-velocity flow area and high velocity flow area. The low velocity area is mainly distributed in the center of the section, while the high-speed flow area is distributed in the periphery of the section, which showing an approximate circular distribution. Secondly, in terms of velocity amplitude along the flow field, from the proximal section downstream of the cross-cylinder system to the distal section. The higher the overall velocity amplitude of the low-velocity flow area in the middle part, the lower the velocity amplitude of the surrounding high-speed flow area. The flow fields in the two areas shows a convergence change with the increase of the distance from the cross-cylinder system. Finally, in terms of the pressure characteristics of the flow field, the pressure along the flow field shows a downward trend as whole, and the average pressure of the pipeline flow field section at Z6 is only 3.4% different from that at the same flow.
2023 Vol. 41 (1): 44-49 [Abstract] ( 19 ) [HTML 1KB] [ PDF 8463KB] ( 233 )
50 Numerical simulation investigation of entrapped air pocket based on TFM model and PIV test research
LUO Shuang,CHEN Qi,LIU Xia,JIANG Jin*,PENG Yu
In order to investigate the dynamics characteristics of entrapped air pocket in the summit of hydraulic pipeline, a more effective numerical simulation method is sought. The multiphase flow field of entrapped air pocket has been established by the two-fluid model(TFM), and the analysis has been conducted by compared with the prediction results of VOF model. In addition, the velocity distribution of the air pocket′s local flow field has been measured by the particle image velocimetry system(PIV). Thus, the rationality of the simulation method can be verified. The results indicated that: In the process of the entrapped air pocket moving downward with the flow, the great flow velocity gradient at the front of the entrapped air pocket makes the regional flow pattern disordered, leading to the failure of the surface tension of the entrapped air pocket to maintain its shape and then breakage occurs. VOF model cannot simulate the relative motion of gas and liquid phase, the predicted speed of the air pocket was significantly larger than the actual value.The TFM model fully considers the influence of momentum transfer and relative velocity between gas and liquid, which can accurately predict the dynamics beha-vior of air pocket and velocity distribution of flow field. In conclusion, compared with the VOF model, the TFM model can provide more reasonable prediction results.
2023 Vol. 41 (1): 50-55 [Abstract] ( 32 ) [HTML 1KB] [ PDF 4585KB] ( 314 )
56 Study on aerodynamic characteristics of straight-bladed vertical axis wind turbine with guide vane
SU Zhenluan,LI Yan,*,TONG Guoqiang,FENG Fang,
In order to improve the aerodynamic characteristics of the straight-bladed vertical axis wind turbine, a plate type guide vane was installed outside the wind turbine to change the direction of the incoming flow, and improve the flow around the blade and enhanced the aerodynamic characteristics of the wind turbine. A four-bladed small-scale straight bladed vertical axis wind turbine with NACA0018 airfoil was used as the object to study the width, angle and distance from the wind turbine by using a quadratic orthogonal rotational design method with six flat plate type guide vanes uniformly installed on the outside of the wind turbine. Taking the average static torque coefficient as the target, a set of optimal guide vane structure parameters is obtained by numerical simulation study and the static flow field is analyzed. Based on the optimal guide vane structure parameters obtained from the numerical simulation, a model of the guide vane and wind turbine was fabricated and wind tunnel tests were conducted. The results show that the installation of the guide vane could effectively improves the starting perfor-mance and aerodynamic performance of the straight-bladed vertical axis wind turbine. When the wind speed was 10 m/s, the maximum static torque coefficient and power coefficient of the wind turbine increased by 35.6 and 39.5 percent, respectively, when compared to the wind turbine without a guide vane. This study can provide a useful reference for research on the use of guide vanes to enhance the performance of wind turbines.
2023 Vol. 41 (1): 56-61 [Abstract] ( 15 ) [HTML 1KB] [ PDF 5660KB] ( 239 )
62 Analysis on evolution of carrying state of water and soil resources in artificial oases in arid areas
XU Cundong,HU Xiaomeng,*,LIU Zijin,WANG Xin,REN Zihao,ZI Yahui,
In order to clarify the evolution process of the water and soil resources bearing status of the artificial oasis in arid area in time series. Taking Jingdian Irrigation Area in Gansu Province as an example, the multi-level fuzzy classification theory was introduced to establish a comprehensive evaluation index system of the water and soil resources bearing status. Based on entropy weight method and matter element analysis theory, a matter element analysis model is built, and a comprehensive evaluation cloud model is built by integrating the golden ratio method, combination weighting method and cloud theory to comprehensive evaluation of water and soil resources bearing capacity of the irrigation area in 1994, 2002, 2010 and 2018. The results show that the water and soil coordination degree and groundwater mineralization degree are the dominant factors for the change of water and soil resources bearing capacity in the irrigation area. The bearing capacity of water and soil resources in the study area is between ″slight bearing and good bearing″ state in all periods, and showing a benign evolution trend as a whole. The entropy(En)and super entropy(He)values of the comprehensive eva-luation cloud of water and soil resources bearing capacity are 0.027 1, 0.026 3, 0.024 4, 0.026 7 and 0.006 7, 0.007 8, 0.006 5, 0.005 7, respectively, which are small values and He/En is less than 1/3, indicating that the assessment results are consistent with the actual water and soil resources bearing state.
2023 Vol. 41 (1): 62-69 [Abstract] ( 25 ) [HTML 1KB] [ PDF 7475KB] ( 247 )
70 Estimation model of evapotranspiration(ET0) of different reference crops in Jiangsu area
WANG Ting,LIU Chunwei*,ZHANG Pei,WANG Ranghui,QIU Rangjian,ZHOU Limin,WANG Meng
To study the applicability of ET0 estimation methods for different reference crops in Jiangsu area, this study collected meteorological data from January 1957 to December 2019 in Xuzhou site, Gaoyou site, and Kunshan site, Jiangsu Province, and used 12 different models to estimate the refe-rence crop evapotranspiration(ET0)at each site. Among the estimation models, Priestly-Taylor, Hansen, Jensen-Haise and Makkink are models based on radiation, MC-Cloud, 1985 Hargreaves and Thornthwaite are based on temperature, Copais, Valiantzas 1 and Valiantzas 2 are integrated me-thods, SVM and XGBoost are machine learning models. The calculated values of 12 models for estimating ET0 were compared with the Penman-Monteith model(PM). The results showed that: The SVM model has the highest GPI(comprehensive evaluation index)value of the three sites. With the same input parameters, the simulation accuracy of the machine learning model is better than that of Priestley-Taylor and Makkink models in the synthesis method, the temperature method, and the ra-diation method. As the input parameters of machine learning model decrease, the simulation accuracy of the machine learning model decreases in turn. The above research results can provide a scientific basis for estimating ET0 when the meteorological data in Jiangsu area are imperfect.
2023 Vol. 41 (1): 70-79 [Abstract] ( 22 ) [HTML 1KB] [ PDF 4073KB] ( 369 )
80 Effects of water and fertilizer regulation modes on water fertilizer and utilization efficiency of Spring Maize in coastal saline-alkali land
LI Yihan,ZHOU Beibei*,REN Peiqi,SHAN Yuyang,XUE Wenqiang
In order to explore the effects of different irrigation methods and nitrogen fertilizer application rates on water, fertilizer and salt migration process and crop growth in coastal saline-alkali land, based on the field experiments, the effects of different irrigation methods and irrigation amounts(F: flood irrigation, 360 mm; D1: drip irrigation, 360 mm; D2: drip irrigation, 288 mm; D3: drip irrigation, 216 mm), effects of nitrogen fertilizer treatment(N1: 280 kg/hm2, N2: 196 kg/hm2, N3: 112 kg/hm2)on soil water, fertilizer and salt distribution in saline alkali land and growth indexes of Spring Maize. The results show that under the drip irrigation mode, the average water content of profile N1 is the lowest,the salt washing point appears in D1 and D2 treatment and there is a shallow salt area suitable for crop growth. After irrigation, the nitrate content of D1N1 increased most significantly and the content was the highest. There was no obvious nitrate accumulation point in the low nitrogen treatment corresponding to drip irrigation treatment. Under the same irrigation amount, the effective nitrogen content of flood irrigation treatment was higher than that of drip irrigation, but its effective nitrogen utilization rate was lower than that of drip irrigation treatment. The difference of dry matter of spring maize under different nitrogen application increased with the increase of irrigation. There were significant differences between water use efficiency and fertilizer partial productivity in each treatment. The partial productivity of high water and low nitrogen fertilizer was improved significantly, but its water use efficiency was low,and the yield of D1N1 was the highest. When considering crop yield and water and fertilizer utilization efficiency, drip irrigation is adopted. The irrigation amount is between 288-360 mm and the nitrogen application amount is 196 kg/hm2.
2023 Vol. 41 (1): 80-88 [Abstract] ( 28 ) [HTML 1KB] [ PDF 1750KB] ( 292 )
89 Response characteristics of saline soil evaporation in Yellow River Delta under different salinity levels
YU Chao,SUN Chitao*,ZHANG Qian,SUN Yuxia,ZHU Ziguo,LI Bo,LYU Pengchao,YU Shaoli
In order to explore the response characteristics of soil evaporation in the Yellow River Delta under different salinity levels, saline water with salinity of 5, 10, 30, 50, 70, and 90 g/L were utilized to irrigate the 0-40 cm soil(which were labeled T1—T6 in turn)in the Yellow River Delta. And soil moisture treatment with different salinity gradient is marked as treatment T1—T6 in turn. The soil water content, electrical conductivity, evaporation intensity and cumulative evaporation were measured during the experimental period. The results showed that the surface soil moisture and electrical conductivity increased gradually with the increase of soil salt content during evaporation process. At the end of evaporation, the average water content of soil surface layer treated with T1—T6 was 80.0%-95.8% lower than that at the beginning of the experiment. The soil electrical conductivity of the surface layer increased by 135%-330%, and the electrical conductivity increase of soil surface during the early evaporation stage was significantly higher than that during the later stage. The distribution of soil moisture and electrical conductivity were significantly effect by soil salt content. At the end of evaporation, the soil moisture content of 0-2 cm surface layer of T1—T6 treatments were 8.3%-30.5% lower than that of 3-6 cm, while the electrical conductivity of 0-2 cm for T1—T6 treatments were 82%-196% higher than that of 3-6 cm. The difference between surface and deep layer for soil salt content gradually increased with the increase of soil salt content. During the evaporation process, the average soil evaporation intensity and cumulative evaporation decreased with the increase of soil salt content, and the average evaporation intensity of T1—T6 treatment were 3.5×10-4, 3.5×10-4, 3.4×10-4, 3.2×10-4, 3.0×10-4 and 2.7×10-4 mm/d, and the cumulative evaporation were 26.13, 26.20, 25.50, 24.26, 22.50 and 20.58 mm respectively. The average evaporation intensity and accumulated evaporation of each treatment in the early stage of evaporation were higher than those in the late stage of evaporation. The inhibitory action of soil salt content on soil evaporation was mainly in the early stage of evaporation. The results showed that soil salinity could affect the distribution of soil moisture and electrical conductivity, as well as soil evaporation intensity and cumulative evaporation.
2023 Vol. 41 (1): 89-95 [Abstract] ( 19 ) [HTML 1KB] [ PDF 3877KB] ( 296 )
96 Multi-objective technical parameters optimization of sprinkler irrigation system with dynamic hydraulic pressure on sloping land
FU Boyang,ZHANG Lin*,HUANG Yu
Dynamic hydraulic water supply can effectively improve the distribution uniformity of sprinkler irrigation on sloping land. In order to optimize the technical parameters of dynamic hydraulic pressure sprinkler irrigation meeting the dual objectives requirements of sprinkler irrigation quality and less economic input, the technical parameters such as sprinkler spacing, layout mode, dynamic pressure parameters(average pulsating pressure, amplitude)and other technical parameters were chosen as input indicators. Taking the sprinkler irrigation intensity, uniformity, initial investment and annual ope-ration cost as output indicators, the effectiveness of DMU was evaluated by data envelopment analysis(DEA), and non-effective DMU was improved. Combined with the antagonistic cross evaluation, the technical parameters were sorted, and the optimization method of technical parameters was constructed. Taking sprinkler Rainbird R5000 as the research objective, the field engineering design of sprinkler irrigation system was carried out on the slope where alfalfa was planting area of 1 hm2(slope of 10%). Finally, the dynamic hydraulic slope sprinkler irrigation technical parameters with the maximum value of cross-evaluation efficiency were optimized as follows: the sprinkler should be arranged in a square with a spacing of 8 m, the average water pressure was 300 kPa, and the amplitude of water pressure was 50 kPa.
2023 Vol. 41 (1): 96-101 [Abstract] ( 18 ) [HTML 1KB] [ PDF 1237KB] ( 254 )
102 Emitter discharge characteristics of vertical tube irrigation affected by various factors
WANG Cheng,BAI Dan*,LI Yibo,BAI Xueli
To examine the working principle of vertical tube irrigation, variations in vertical tube emitter discharge and their causes were analyzed in the laboratory experiment. The effects of the pressure head, initial soil water content, and tube diameter on the emitter discharge of the vertical tube were studied. The quantitative relationship between the time and cumulative infiltration and emitter discharge of the vertical tube was obtained, and R2 was more than 0.98. Emitter discharge exhibits a positive and negative correlation with the pressure head and soil water content, respectively. Tube diameter has a nonsignificant effect on the emitter discharge. Changes in the soil water content around the emitter water outlet are the main causes of emitter discharge variations. In the experiments, the range of vertical tube emitter discharge was 0.056-1.102 L/h. The emitter of vertical tube irrigation automatically adjusts the soil water content and maintains the root zone soil water content within an appropriate range, thus achieving continuous irrigation, in order to achieve the effect of water-saving.
2023 Vol. 41 (1): 102-108 [Abstract] ( 28 ) [HTML 1KB] [ PDF 1283KB] ( 230 )
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