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Journal of Drainage and Irrigation Machinery Engin
 
2022 Vol.40 Issue.11
Published 2022-11-25
1
2022 Vol. 40 (11): 1- [Abstract] ( 11 ) [HTML 1KB] [ PDF 42955KB] ( 323 )
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2022 Vol. 40 (11): 2- [Abstract] ( 17 ) [HTML 1KB] [ PDF 1106KB] ( 295 )
1081 Influence of inclined impeller outlet on internal flow characteristics of long shaft fire pump
ZHANG Jinfeng*,JIN Chengming,YANG Zhijun,SHI Weidong,SONG Haiqin,LAI Liangqing
Taking the XB4.3/240-300LC vertical long shaft fire pump as the research object, under the condition that the blade wrap angle, the inlet and outlet placement angle, the width of the impeller outlet, the axial distance from the middle position of the impeller outlet to the impeller inlet and the radial distance from the rotating shaft, cross-sectional area of outlet flow and the radial coordinate value of the intersection of the blade inlet edge and the front cover streamline are constant, and various schemes are designed. The shear stress transfer(SST)model is used to carry out numerical simulation and internal flow field analysis for different schemes, so as to find the optimal impeller outlet inclination angle when the pump hydraulic characteristics is the best. The results show that by changing the tilt angle of the impeller outlet, the head and efficiency increase slightly under low flow conditions, while the increase is relatively large under high flow conditions. When the inclination angle of the impeller is 15°, the head and efficiency appears peak values. If the inclination angle continues to increase, the two will decrease instead. If the inclination angle is 15°, it is considered as the optimal impeller outlet inclination angle, and compared with the original plan, the head and efficiency are increased by 5.95% and 1.19%, respectively. The circumferential and radial components of the absolute velocity at the outlet of the impeller have good consistency in the large flow conditions,and the inclination angle of the impeller outlet has little effect on it. The two components of the absolute velocity of each scheme have poor distribution regularity in the flow channel under small flow conditions. The inclined outlet of the impeller has great influence on the distribution of turbulent kinetic energy inside the annular space and the space guide vane.
2022 Vol. 40 (11): 1081-1088 [Abstract] ( 25 ) [HTML 1KB] [ PDF 5413KB] ( 433 )
1089 Nonlinear vibration characteristics of bulb tubular unit under influence of faulty oil receiver
ZHANG Leike*,WU Jing,WANG Xueni,MA Zhenyue,ZHANG Jinjian,TANG Hualin
Accident of bulb tubular unit caused by fault oil receiver components occasionally, which directly affects the safety and stability of unit operation. Based on constructing unbalanced magnetic pull model under the influence of compound eccentricities, the shaft model of bulb tubular unit with fault oil receiver and corresponding differential equation are established. Nonlinear vibration characte-ristics of rotor system in the process of excitation current, static eccentricity of air gap and dynamic eccentricity are studied by numerical analysis. The results show that, on one side, the unsteady motion range and the adverse vibration of rotor is increased due to fault oil receiver, on the other side, the failure part plays a positive role in suppressing system amplitude and weakening harmonic component to certain extent. Furthermore, compared with the constant static eccentricity, the dynamic eccentricity, which is continually changing with the unit operation, makes the system produce more abundant responses such as quasi-periodic and periodic-2 motions, meanwhile, the stable operating range is reduced, which needs to be paid enough attention to. The results can provide useful references for the safe operation and stability analysis of bulb tubular hydropower units.
2022 Vol. 40 (11): 1089-1096 [Abstract] ( 24 ) [HTML 1KB] [ PDF 3899KB] ( 444 )
1097 Influence of mineral particle size on wear characteristics of deep-sea mining lifting pump
SUN Xuelei,LIU Houlin,TAN Minggao*,WU Xianfang,ZHANG Keke
In order to study the effect of particle size on the wear characteristics of overflow components of deep-sea mining lifting pump, the DPM model was used to simulate the solid-liquid two-phase flow in the pump, and the wear of particles on overflow components was simulated by the Oka wear model based on fluid dynamics to analyze the wear law of the lifting pump under different particle sizes. The results show that with the increase of particle size, the wear of the front and rear cover of the first stage impeller and secondary impeller is gradually distributed evenly, and the concentrated area of the wear of the front cover shifts from the outlet pressure surface to the middle of the impeller and the inlet suction surface, and the concentrated area of the wear of the rear cover shifts from the inlet suction surface to the outlet pressure surface, and the wear area of both the inlet and outlet of the vane gradually increases; the inlet wear of the first stage space guide vane and the secondary space guide vane is gra-dually increased. When the particle size increases from 1.0 mm to 5.0 mm, the maximum wear amount of the front cover plate of the first stage impeller and secondary impeller increases 132.9% and 104.2% respectively, and the maximum wear amount of the blades of the first stage impeller and secondary impeller increases 172.3% and 142.5%, respectively. The maximum wear of the rear cover plate of the primary and secondary impellers increased by 251.4% and 102.3%, and the maximum wear of the primary and secondary guide vanes decreased by 87.08% and 74.26%, respectively.
2022 Vol. 40 (11): 1097-1103 [Abstract] ( 19 ) [HTML 1KB] [ PDF 2841KB] ( 535 )
1104 Experiment and numerical simulation on hydraulic characteristics of novel trapezoidal measuring weir
GAO Feifei,LI Xiaoqing*,GAO Qiang
Trapezoidal measuring weir is widely used in the end channels of irrigation area because of its simple structure and high flow measurement accuracy. However, the existing trapezoidal measuring weir in irrigated areas has the problems of small flow measurement range and easy deposition of sediment in front of the weirs, which seriously restrict its application and popularization. Therefore, based on the improved standard weir, a new type of trapezoidal measuring weir was proposed. Dimensional analysis method was used to determine the basic pattern of flow formula. Based on the results of hydraulic model experiment, numerical simulation model parameters are calibrated. The water depth, weir flow value, velocity distribution and velocity vector diagram of four new trapezoidal measuring weirs under different flow conditions are obtained by using Fluent software. Finally, the flow measurement formula is fitted by the experiment data. The result shows that the influence of the orifice outflow of the new trapezoidal measuring weir with different orifice heights on the outflow of the weir decreases with the increase of the total head in front of the weir. The fitted flow formula is simple and easy to use, with an average relative error about 2.63%. By comparing the simulation results and that of expe-rimental results, it is found that they are in high degree of agreement with average relative error of 2.53%, which indicating that the simulation results have a certain reliability, and can provide basis for engineering design of weir hole combined water measuring facilites.

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2022 Vol. 40 (11): 1104-1111 [Abstract] ( 28 ) [HTML 1KB] [ PDF 2351KB] ( 376 )
1112 Analysis of safety monitoring indicators of dragon-head spillway tunnel
ZHANG Chunjin,SUN Xihuan*,LI Yongye
Based on the 1∶40 normal hydraulic model experiment, the RNG k-ε two-equation turbulence model is used to analyze the hydraulic characteristics of the flow field in the connection sections of the Xiaolangdi Hydropower Station 2# dragon-head spillway tunnel under the two characteristic flood level conditions of design and verification.The hydraulic characteristics of the spillway tunnel, such as the discharge capacity, the velocity distribution, the pressure distribution and the cavitation number were analyzed. At the same time, the safety monitoring indicators of the dragon-head spillway tunnel were proposed from the perspectives of the cavitation number, the cross-section velocity, the piezometric head and the remaining space of roof, and the safety monitoring and early warning levels of the dragon-head spillway tunnel were constructed. Research conclusions: the simulated results of the flow coefficient, the cross-sectional velocity and the piezometric head were in good agreement with the experimental results, which indicated that the numerical simulation can better calculate the hydraulic characteristics of the flow field in the connection section of the dragon-head spillway tunnel. The risk degree of the dragon-head spillway tunnel can be divided into four levels of early warning status: safety, low-alarm, medium-alarm and high-alarm. The safety monitoring indicators that affect the safe operation of the dragon-head spillway tunnel in descending order of the weigh were the cavitation number, the piezometric head, the remaining space of roof and the cross-section velocity. This research will provide theoretical guidance and technical support for the optimization design and safe construction of the dragon-head spillway tunnel.
2022 Vol. 40 (11): 1112-1119 [Abstract] ( 19 ) [HTML 1KB] [ PDF 6958KB] ( 353 )
1120 Prediction for water hammer pressure signal based on empirical mode filter and recurrent neural network
ZHANG Bo,XU Zhuofei,LI Xiaozhou,MAO Zhenkai,GUO Pengcheng*
To accurately predict the change trend of water hammer impact signal and get the characte-ristics of impact strength and energy in advance, a prediction model based on Empirical Mode Decomposition(EMD)and Recurrent Neural Network(RNN)was proposed for the pressure signals from water hammer impact. Firstly, a series of Intrinsic Mode Function(IMF)was obtained from EMD method, and then high frequency noise components were eliminated according frequency characteristics in water hammer to realize the filtering and reconstruction. The filtered signal energy loss is less than 0.1% and the smoothness is good. Secondly, a prediction model for time series based on RNN model is established and the test platform is built to obtain the water hammer impact signal, and the RNN model was trained with a few samples. Then, a sequence prediction for water hammer impact signals under different flow rates was realized. Although the flow rates are different between the training and testing sets, the result is accuracy and reliable according assessment based on energy loss, amplitude loss and R2 coefficient. Comparing the predicted water hammer signal with the actual signal, the R2 coefficient is greater than 0.9900, and the amplitude and energy loss are less than 1%, which verifies the correctness of the proposed method.
2022 Vol. 40 (11): 1120-1125 [Abstract] ( 23 ) [HTML 1KB] [ PDF 3092KB] ( 386 )
1126 Experimental study on effect of different NaCl concentrations and temperature on drag reduction characteristics of Xanthan gum
LIN Yuying,XU Shengxuan,ZHAO Wenbin,LI Mingyi,LI Changfeng*
In order to investigate the drag reduction characteristics of xanthan gum(XG)in NaCl environment and the influence of temperature on the drag reduction performance, the drag reduction cha-racteristics test of xanthan gum solution with different concentrations of NaCl was carried out in a DN20 pipe made of transparent acrylic tube. For different mass fractions of XG solution with NaCl addition(XG/NaCl solution), the relation between the drag reduction efficiency and flow Reynolds number(Re)was obtained and compared with the drag reduction characteristics of XG solution. The result show that in dilute XG solution(0.01%-0.02%), the NaCl concentration has a greater influence on drag reduction rate with different Re, but has less influence on concentrated xanthan solution(0.05%-0.06%). In high NaCl concentration, the drag reduction type B is generally followed when the concentration of XG solution is lower than 0.03%. When the concentration of XG solution is greater than or equal to 0.03%, the solution has the conversion characteristics from type A drag reduction at low Re to type B drag reduction at high Re. The drag reduction rate of XG solution is sensitive to temperature change at low Re, while the drag reduction rate at high Re is less affected by temperature.
2022 Vol. 40 (11): 1126-1131 [Abstract] ( 28 ) [HTML 1KB] [ PDF 2568KB] ( 376 )
1132 Effect of elastic diaphragm characteristics on hydraulic performance of pressure-compensating emitter
WANG Yanbang,LYU Chang,DONG Aihong,ZHANG Wenqian,ZHANG Erxin,NIU Wenquan*
In order to determine the relationship between the performance of the elastic diaphragm and the hydraulic performance of the emitter, and promote the establishment of the scientific design method of the pressure-compensating emitter in China. The influence of the elastic diaphragms hardness and thickness on the hydraulic performance of the emitter was studied by means of flow pattern index, starting pressure and compensation range of the labyrinth channel structure emitter were studied. The results show that the hardness and thickness of the elastic diaphragm have significant effects on the emitter flow(P≤0.01), and the hardness had a greater effect on the emitter flow than the thickness. The hardness and thickness of the elastic diaphragm are positively correlated with the flow coefficient, the starting pressure and the compensation interval, and negatively correlated with the flow index. There is an appropriate elastic diaphragm characteristic range, so that different structure pressure-compensating emitters have small starting pressure, minimum flow index and maximum compensation interval. When the elastic diaphragm hardness is 60 HA and thickness is 1.2 mm, the emitters have the minimum flow index of 0.078. The mathematical relationship between the characteristic parameters of the elastic diaphragm and the flow, flow pattern index, starting pressure and compensation interval is established, which can provide a theoretical basis for the rapid development of the pressure-compensating emitter.

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2022 Vol. 40 (11): 1132-1137 [Abstract] ( 24 ) [HTML 1KB] [ PDF 1782KB] ( 331 )
1138 Effects of nitrogen fertilizer reduction combined with organic fertilizer on yield, quality and nitrogen utilization efficiency of Chinese Cabbage
LIU Zhongliang,GAO Junjie*,CHEN Zhen,YAN Weiqiang,GU Duanyin
To study the reasonable and effective fertilization mode of Chinese cabbage in Huang Huai Hai area, ′Beijing New No. 3′ was used as the test material, 12 different treatments were set as: CK1: No fertilization, CK2: Conventional fertilization, T1: Conventional reduced fertilizer N 100%, T2: Conventional reduced fertilizer N 15%, T3: Conventional reduced fertilizer N 15% + Organic fertilizer replaced N 15%, T4: Conventional reduced fertilizer N 30%, T5: Conventional reduced fertilizer N 30% + Organic fertilizer replaced N 15%, T6: Conventional reduced fertilizer 30% + Organic fertilizer replaced N 30%, T7: Conventional reduced fertilizer N 40%, T8: Conventional reduced fertilizer N 40% + Organic fertilizer replaced N 15%, T9: Conventional reduced fertilizer N 40% + Organic ferti-lizer replaced N 30%, T10: conventional reduced fertilizer N 40% + Organic fertilizer replaced N 40%. The effects of nitrogen fertilizer reduction combined with bio-organic fertilizer on the yield, qua-lity, soil nutrients accumulation and nitrogen utilization efficiency of Chinese cabbage were studied. The results showed that the reduction of nitrogen fertilizer combined with bio-organic fertilizer significantly improved the yield and quality of Chinese cabbage. The highest T3 treatment was 307.43 t/hm2, which was 63.06%, 14.49% and 36.68% higher than that of treatment CK1, CK2 and T1, respectively. It was positively correlation with the content of available nitrogen and potassium in soil. Compared with the conventional fertilization, the nitrate content of Chinese cabbage was significantly reduced and the content of vitamin C and soluble sugar was increased by the combination of nitrogen fertilizer reduction and bio organic fertilizer. The reduction of nitrogen fertilizer and the application an appropriate amount of bio-organic fertilizer also has a significant impact on soil enzyme activity. The application of appropriate amount of organic fertilizer also enhanced the activities of urease, invertase, alkaline phosphatase in rhizosphere soil, while acid phosphatase activity decreased. In addition, compared with T1 treatment, the nitrogen utilization efficiency was increased by 5.54%-60.71%. Considering the yield, quality and nitrogen utilization efficiency of Chinese cabbage, the treatment of conventional fertilizer reduction N 15% + organic fertilizer replacement N 15% was the best fertilization method.
2022 Vol. 40 (11): 1138-1144 [Abstract] ( 24 ) [HTML 1KB] [ PDF 2889KB] ( 384 )
1145 Comprehensive analysis of affecting factors on sprinkler irrigation uniformity based on orthogonal experiment
TANG Yuting,YANG Shengxiang,YANG Jinping,GUO Yijian,YUAN Shouqi*
In order to optimize the irrigation and fertilization conditions of the light and small translational sprinkler irrigation units, an orthogonal test was designed to investigate the effect of three factors fertilizer concentration, nozzle vehicle travel speed and sprinkler height on the performance of water-fertilizer integration in the light and small translation sprinkler irrigation units at a sprinkler operating pressure of 0.25 MPa and a proportional fertilizer pump inlet and outlet pressure of 0.22 MPa. The test results were analyzed by extreme difference and variance to obtain the optimal horizontal combination of the three factors and compare the size of three influencing factors. The results showed that: (1) The main factors affecting the uniformity of fertilizer concentration(CU1)and the uniformity of fertilizer concentration distribution(DU1)are the height of sprinkler irrigation, while the fertilization concentration and walking speed have little impact on it, and the significance is higher than 0.05. (2) The main factor affecting CU2 is the travel speed, followed by the sprinkler height, and the fertilizer concentration has no significance on it. (3) The influence factors of fertilizer concentration, sprinkler height and travel speed on DU2 are all greater than 0.05. (4) The optimal fertilizer technology level combination is A1B2C2, where the fertilizer concentration is 0.4 g/L, the spray irrigation height is 1.2 m and the travel speed is 30 m/h.
2022 Vol. 40 (11): 1145-1150 [Abstract] ( 37 ) [HTML 1KB] [ PDF 1220KB] ( 412 )
1151 Analysis of factors influencing quality of newly increased cultivated land and grain productivity in arid highland area —taking occupation complementary balance project as an example
HE Zhenjia,HE Wei*,LI Liurong,ZHANG Jun,LI He
In order to reveal the impact of the arable land complementary balance project on the grain production capacity of the Weibei platform area, with winter wheat and spring corn as the quantitative standards, and the Logistic regression model is adopted to study the factors influencing grain producti-vity of newly added farmland for typical arable land complementary balance project in Weibei platform area Qianyang County in 2017. At the same time, the changes in the physical and chemical properties of the newly added arable land before and after the implementation of the project were analyzed. The results show that the implementation of complementary balance project increased the level of new cultivated land by 1 to 2 levels, and the larger the proportion of irrigated land in the newly increased cultivated land, the higher the level of newly added cultivated land. The increase rate of grain production capacity per unit area of irrigated land is 25% higher than that of dry land. With the increase in the implementation years of the complementary balance project, the physical and chemical properties of soil have been continuously improved, the total soil porosity, large aggregates, water-stable aggregates and micro-aggregates all increase significantly(P<0.05), the damage rate of soil structure was significantly reduced(P<0.05), and the erosion resistance was significantly improved(P<0.05). The quality ratio of soil organic matter increased significantly(P<0.05), and the status of soil nutrientsimproved continuously. Factors such as the area, the level, infrastructure, the investment per unit area, years and the other factors of newly increased cultivated land are positively correlated with grain production capacity. The influence degree of each factor on the grain production capacity of the newly increased cultivated land is ranked from large to small in terms of grade, area, infrastructure, age and investment.
2022 Vol. 40 (11): 1151-1158 [Abstract] ( 30 ) [HTML 1KB] [ PDF 1061KB] ( 512 )
1159 Inversion model of soil total nitrogen content based on ridge regression
XU Yi,SHAO Guangcheng*,DING Mingming,ZHANG Erzi,HE Jing
Soil total nitrogen content is one of the core indexes of soil fertility. It is important for agricultural production to rapidly and accurately determine the soil total nitrogen content. A typical rice farmland in Jiangning District, Nanjing was taken as the research object. The checkerboard method was used to select 60 points, and each point was sampled in the 0-30 cm topsoil layer. The spectral reflectance of soil samples in the bands of 450, 560, 650, 730 and 840 nm was obtained by using DJI Phantom 4 Multispectral at the same time. Through the multivariate linear analysis of soil total nitrogen content and spectral reflectance, the unique multicollinearity problem characteristic of the spectral reflectance data was revealed. A prediction model for soil total nitrogen content retrieved from UAV remote sensing images based on ridge regression was constructed. The calculation results showed that when the ridge regression coefficient reached 0.12, the linear regression determination coefficient(R2)was 0.408, and the variance inflation factors were under 10, and the regression coefficients are significantly different. The inversion model based on ridge regression can give good consideration to both inversion accuracy and spectral data multicollinearity of spectral data. The research results can provide a theoretical basis for UAV remote sensing diagnosis of soil nitrogen nutrition.
2022 Vol. 40 (11): 1159-1166 [Abstract] ( 28 ) [HTML 1KB] [ PDF 1822KB] ( 523 )
1167 Remote sensing monitoring method of cultivated land irrigation area in Baojixia Irrigation District based on GEE
XU Chao,LYU Jingyu,LIU Yujun,JIANG Yanan*
Accurate monitoring of the changes of cultivated land irrigation area is of great significance for managing limited agricultural water resources and ensuring food security. Baojixia Irrigation District of Shaanxi Province, a typical irrigation district in arid and semi-arid areas of northwest China, was selected. Landsat satellite data based on GEE cloud platform, on the basis of extracting the range of cultivated land use classification, combined with field sampling points, and based on the actual situation of Baojixia Irrigation District, a method for obtaining historical sample points is proposed. By calculating NDVI, EVI, GCVI, WGI and other indexes as classification parameters. The random forest algorithm was used to identify and extract the irrigated areas of cultivated land in 2010 and 2020. The results show that the irrigated area of cultivated land in Baojixia Irrigation District in 2010 and 2020 are 104 211 hm2 and 90 174 hm2 respectively, and with overall accuracy of 91.67% and 95.35%, Kappa coefficients are 0.832 and 0.907.

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2022 Vol. 40 (11): 1167-1172 [Abstract] ( 31 ) [HTML 1KB] [ PDF 7504KB] ( 495 )
1173 Research and application of intelligent agricultural internet of things equipment based on micro-hydro power generation system
LI Kexin,ZHENG Yuan*,CHEN Yuegang,GAO Wei
In view of the current situation of water resources shortage in China and the low effective utilization rate of agricultural irrigation water. To improve the efficiency and efficiency of agricultural irrigation water, accelerate the research and development and promotion of high-tech intelligent agricultural equipment, and reduce the proportion of agricultural input and agricultural water use. The nume-rical simulation and orthogonal model tests were combined, a four-factor and three-level orthogonal test optimization scheme was formulated, and the performance of the new micro-pipe turbine at the design flow point was calculated for 9 different schemes, and verified by physical model test. The results show that the pressure pulsation in the turbine is mainly affected by the blade passing frequency and the passing frequency of the guide vanes. Under the design flow rate, the optimized output of the turbine is 6.30 W, and the efficiency is 85.13%, which are respectively increased by 32.35% and 2.58% when compared with the preliminary design scheme. At the same time, the front-end and terminal systems of the intelligent agricultural internet of things have been developed, and a comprehensive agricultural Internet of things intelligent management system has been established that integrates self-generation, environmental monitoring, remote control, condition early warning, and growth status analysis, which greatly facilitates users. Intelligent planting and breeding technology provides a practical solution.
2022 Vol. 40 (11): 1173-1180 [Abstract] ( 33 ) [HTML 1KB] [ PDF 3837KB] ( 406 )
1181 Inversion of soil moisture content based on UAV thermal infrared image
XU Honggang,CHEN Zhen,CHENG Qian,LI Peng,FAN Yongshen*
This study takes summer maize in different growth periods as the research object. The accuracy and inversion methods of the UAV thermal infrared inversion of soil moisture content in summer maize fields were discussed. The visible light and thermal infrared images of the test area were acquired by UAV. The canopy mask was extracted from the visible light image and superimposed on the thermal infrared image to extract the corn canopy temperature. The change trend of the canopy temperature and its correlation with the leaf area index(LAI)were analyzed. Finally, a new index(DTL)was constructed by using the inverse number of atmospheric temperature difference and leaf area index, and the accuracy of retrieving soil water content by canopy atmospheric temperature difference or the DTL index was discussed. The experimental results showed that using visible light image to obtain the canopy mask and superposed with thermal infrared image to extract the maize canopy thermal infrared could effectively improve the accuracy of canopy temperature extraction. In the same period, canopy temperature decreases with the increase of soil moisture content(regardless of marginal effect). Summer maize LAI can represent canopy temperature to a certain extent. Comparing the data of the four periods, it is found that the inversion effect of canopy air temperature difference is better after irrigation(for example, R2 was 0.614 6 and 0.463 7). Compared with canopy air temperature difference, the DTL index inversion can improve the accuracy of soil moisture retrieval. For example, R2 was improved from 0.614 6 and 0.463 7 to 0.661 6 and 0.485 0 at depth of 0-20 cm. This study is a new attempt to retrieve the soil moisture content of summer maize field by thermal infrared.
2022 Vol. 40 (11): 1181-1188 [Abstract] ( 22 ) [HTML 1KB] [ PDF 2063KB] ( 472 )
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