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Journal of Drainage and Irrigation Machinery Engin
 
2005 Vol.23 Issue.3
Published 2005-05-25
article
Article
1 The Present Status and Development of Self-priming Pump
LV Zhi-jun , LAN Cai-you , WANG Fu-jun
Self-priming pumps are widely used in sprinkler irrigation and fire protection business. Its recent research achievements were summarized and analyzed, including the building of mathematical models and maximum priming lift, the analysis of self-priming performance influencing factors, the discussion of size and position of return-flow hole as well as the separation tongue gap, the volume of water pre-stored and air- liquid separated chamber inside the pump, the influencing mechanism of shaft sealing and suction line’s leak tightness along with the pipe length under liquid and the volume of suction line on self-priming performance. Some key issues for further research of self-priming pump are discussed as well.
2005 Vol. 23 (3): 1-5 [Abstract] ( 2078 ) [HTML 1KB] [ PDF 340KB] ( 1217 )
6 Solving on Momentum Thickness for Cylinder Impeller
MA Lei, YANG Jun-hu
The reynolds equation is given and the relevant quantities are analyzed. By type factors and transitional momentum integral equation, the approximate expression of momentum thickness is presented as well. The wake laws are applied to deduce relative expressions of turbulent boundary layer thickness; the expressions are regarded as the auxiliary relational expressions to solve momentum thickness. A method is presented that by boundary layer thickness coefficient k δ and momentum thickness δ 2 the fluid calculation without centrifugal force approaches the fluid calculation with centrifugal force gradually. These will be the basiso f further analysis oft hel ow-specific-speed centrifugalp ump.
2005 Vol. 23 (3): 6-10 [Abstract] ( 1048 ) [HTML 1KB] [ PDF 250KB] ( 1382 )
11 Simulation of the Impeller Based on Boundary Layer Theory
MA Sheng-li , XI Ben-qiang , LIANG Bin
The 3-D semulation model of a impeller that based on the blade type line equation derived from boundary layer theory has been set up with pro/E. This model offers one design method to the solid-liquid two-phase flow centrifugal pump, using the clan form of pro/E, so long as inputting impeller’sb asicp arameters which can easily form the impeller model. Thus there is certain reference value to industrial production.
2005 Vol. 23 (3): 11-13 [Abstract] ( 1012 ) [HTML 1KB] [ PDF 371KB] ( 1115 )
14 Numerical Simulation of 3D Turbulent Flow in the Centrifugal Pump with Twisted-blade
FU Qiang, ZHU Rong-sheng, LI Wei-bin
According to peculiarities of the geometry of the centrifugal pump impeller and its inner flow field, method for the grid generation impeller’s passage and the governing equations for calculation of flow field are briefly represented. Based on RANS Equation, SIMPLEC algorithm, the RNG κ - ε model and wall function, the 3-D turbulent flow in the impeller is studied. Results show that the distorted blade profile of centrifugal pump can exert much influence on pressure distribution, velocity distribution and pump抯 performance. This method can be use to improve level of optimization design for the centrifugal pump and check its internalf lowf ield condition.
2005 Vol. 23 (3): 14-16 [Abstract] ( 907 ) [HTML 1KB] [ PDF 242KB] ( 1477 )
17 Study on Method for Model Test of Flow Pattern in Suction Box of Pumping Station
LU Lin-guang, LENG Yu, WU Kai-ping, ZHU Jie
A special system of model test for flow pattern in a suction box of pumping station was designed, and a new method is put forward to carry out the model test for verifying a vertices band in suction box without relative model pump. Examples of model test applying the new method to verify vertices band in both “half elbow” suctionb oxa nd “bell-like” two-way suction box are illustrated respectively. Based on the two examples the advantages of the new method are summarized.
2005 Vol. 23 (3): 17-19 [Abstract] ( 1022 ) [HTML 1KB] [ PDF 139KB] ( 1409 )
20 Scheme Research of Dust Barrier and Cleanup in Large Pump Station
YUAN Nai-hua, LIN Zhen, LI Hui, HE Jia-qing
The often used mode of dust barrier and cleanup are introduced here.Combined with the concrete facts of Jianbi pump station, the structure design and arrangement mode of oblique trash rack and grab dredger are given. By comparison the conclusion can be drawn, the later is of more applicability with lower cost, easy construction and maintenance, better reliability to be used in pump station with more trash.
2005 Vol. 23 (3): 20-22 [Abstract] ( 1007 ) [HTML 1KB] [ PDF 84KB] ( 1271 )
23 Synthetic Control on Yawp in Water Pump Room of One Power Plant
HU Yong-piao, ZHANG Yong, LIANG Rong-guang
A ccording tot he result ofm onitoro f yawp,t hef requencyc harta nalysis, thea rchitecturals tructure and the request from the plant, the ripe transaction technologies is neatly used, including shock absorption, sound insulation, sound absorption, noise elimination, and so on. At the same time, the recent experiences of yawpt ransactiont echnologiesa reu sedf or references.F ortunately,t hes chemet ook all-righte ffect.T he scheme also takes fully consideration of ventilation and heat spread in order to make sure the water pumps working in goodc onditions.
2005 Vol. 23 (3): 23-26 [Abstract] ( 1934 ) [HTML 1KB] [ PDF 183KB] ( 1315 )
27 Performances of Experiments Impellers Trimmed with Different Outlet Angles of Blade for a Centrifugal Oil Pump While Pumping Water
Yang Ren, Li Wen-guang, Cai Yong-xiong, Fei Zhen-tao, Chen Yu, Li Tie
The variation of centrifugal oil pump performance and the influence on the law of accounting fori mpellert rimmed arei nvestigatede xperimentallya ftert hei mpellersw ith differento utleta ngleo fb ladea re cut while handling water. The results show that the flow rates at best efficiency points reduce as the impellers are trimmed, the maximum efficiency of pump raises while the impeller diameter firstly trimmed to 205mm, and the larger the outlet angle of blade is, the greater the increase in the efficiency gets. The exponents of head ands haft-powera rrivea tt hec onstantsr espectivelya t shut-off points.T hee xponentso ff lowr ate,h ead, shaft- power ande fficiencyd iffer fromt hec urrent theoretical values atb este fficiencyp oints.
2005 Vol. 23 (3): 27-31 [Abstract] ( 1119 ) [HTML 1KB] [ PDF 97KB] ( 1324 )
32 Silt of Yellow River Separating Based on Drip Irrigation
XIN Zhou
Aimed at the problem of silt separation of Yellow River’s water for agricultural drop irrigation. The major characteristics of silt in Yellow River and the applying of Hydrocyclone separation technique for silt separation are introduced. The key constructional parameters of Hydrocyclone are calculated by Rietema formula. And critical separation size d ep is checked based on the theory of Bredley equilibrium orbit. A series of experiments are carried out as to how the centrifugal separation is effected by key factors such as sediment concentration,i nlet pressurea nd undersetg ate diametere tc. Ther esultss howt hat,t hes ediment concentration ofY ellowR iveri ncreases, concentration ato utgateh eightens, clarifyingr ated ecreases, ands eparation effect declines;i nletp ressurei ncreases,c oncentrationa to utgate decreases,c oncentrationu ndersetg atee nhances, clarifyingr ateh eightens, ands eparation effect heightens;u nderset gated iameter minishes,c oncentrationa t outgate increasess lightly, concentration atu ndersetg atei ncreasess harply, clarifyingr ated ecliness lightly, bute ffectives eparationq uantityd ecreasess harply, ands eparatione ffect declines.
2005 Vol. 23 (3): 32-34 [Abstract] ( 875 ) [HTML 1KB] [ PDF 68KB] ( 1387 )
35 Modulation Mechanism and Modulation Methods of Unsteady Water Jet
TIAN Chang-liu , MENG Chao
The modulation mechanism of unsteady water jet is discussed in theory, especially the processes ofl iquid-to-beada nd thec ollision betweenj ets andt arget-objectsa fterm odulation area nalyzedi nd etail.A ll kinds of external interruption methods and internal modulation methods about forming unsteady water jet are simply summarized, The advantages and disadvantages of these methods are also presented. According to the comparisono f thesem ethods,t hes elf-excitedo scillationw aterj eta ndi mpactingw aterj ett hroughm odulation of chaos are points out to be promoting.
2005 Vol. 23 (3): 35-38 [Abstract] ( 948 ) [HTML 1KB] [ PDF 49KB] ( 1327 )
39 Economics Benefit Analysis of the Crop under the Condition of Water Saving Irrigation
ZHENG Jie, ZHOU Shi-feng, WU Di-fei
B reaking traditional economic benefit analyze method, which mainly start from the water saving irrigation engineering item, farm crop itself is taken as the main research object instead. The crop species of the same or close irrigation style and the possible economic benefit under the condition with different geography, soil, weather and different market environment are taken as main study contents, which provide more direct and credible reference to make sure the proportion of different crops. Taking the development planning of waters avingi rrigationi nP anzhihuaa se xample, thef easibility ofe valuating ther egionw aters avingi rrigation item with the economic benefit of the crop is demonstrated.
2005 Vol. 23 (3): 39-41 [Abstract] ( 1431 ) [HTML 1KB] [ PDF 40KB] ( 1579 )
42 Design the Constant Pressure Water Supply System by Frequency Control
HU Chi-bing, SANG Rui-peng
The structure and work principle of isobarically water supply system based on PC frequency control is introduced. This system can automatically adjust water pump motor’s rotation speed to keep water supply pressure constant and reduce power loss. In allusion to specific method of using MSComm6.0 function carries out between PC and SIMATIC S7-300 PLC serial communication at pumping station’s scout system and gives a method of communication program by VC++. It keeps water supply pipe network constant pressure and makes water supply system keep in a perfect state for energy saving.
2005 Vol. 23 (3): 42-45 [Abstract] ( 1114 ) [HTML 1KB] [ PDF 51KB] ( 1921 )
46 Improvement of Relayed Drainage System of Large Scale Mine Submerge Motor Pump
HU Wei, Jin Lei
Aimed at the problems existing in dealing with mine drainage emergency in our country, the disadvantage of the relayed drainage system composed by original entirely tubular axial-flow submerged pump and large-scale mine submerged pump is analyzed. A new relayed drainage system made up by oil-filled mixed-flow submerge pump and large-scale mine submerged pump is put forward. The merits of this system is thec haracteristics ofs trongd raina bility,r eliableo perationt hrought rial-productiona nds pot-operation,i t can solve the problems of deep and big runoff drainage, availability and security for the resuming exploitation of the submerged underground coal nine, iron ore, etc
2005 Vol. 23 (3): 46-48 [Abstract] ( 1104 ) [HTML 1KB] [ PDF 82KB] ( 1375 )
49 Four Keys for the Pumping Station’s Reconstruction
TANG Han-zhi
According to the construction and management practice, pumping station’s features in reconstruction was introduced; key points that should be considered in each step was also proposed. In the earlier stage, focus should be put on construction item and detection of electromechanical equipments, in the primaryd esigns tage,t hep roject design parameters’rechecka ndt ypes’selectioni s especiallyi mportant; int he constructions tage,s trictly carryingo utc onstructionp rocedure ist he focus, purchasinga nd install ofe quipments is also of great importance; in the final, the key becomes the financial audit work and to archive all kind of materials ofp roject’sc hecka nda ccept.
2005 Vol. 23 (3): 49-51 [Abstract] ( 987 ) [HTML 1KB] [ PDF 42KB] ( 1183 )
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