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Study on Hydraulic Characteristic and Optimum Design of Pit Tubular Pump System

Author: LiuJun
Tutor: LuLinGuang
School: Yangzhou University
Course: Fluid Machinery and Engineering
Keywords: low head pump system pit tubular pump 3D turbulent flow numerical simulation hydraulic performance optimum design model test
CLC: TV675
Type: Master's thesis
Year: 2009
Downloads: 154
Quote: 3
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Abstract


Accompanying by the global energy shortage day by day, it is very important to increase the pump system efficiency of a large pumping station. The main features of the East-Route Project of South-to-North Water Transfer are low head, large discharge and long operational time. Therefore, the higher requirements for pump system efficiency are put forward.Low head pump system has several types, among which pit tubular pump system is a new one. The hydraulic performance of the pit tubular pump system has not been sufficiently and in-depth researched before. Therefore, the hydraulic performance of the pump system needs to be improved, the hydraulic performance between front-positioned and rear-positioned pit tubular pump system needs to be further compared.By the help of numerical computation mainly while by the help of model test secondly, the numerical computations of 3D turbulent flow and optimum hydraulic design for the inlet and outlet conduits of both front-positioned and rear-positioned pit tubular pump system are completed respectively, improvements of the hydraulic performance of the pit tubular pump system are studied deeply in this paper. The idiographic contents as follows:(1) According the objective of the optimum hydraulic computation for the inlet and outlet conduit, the numerical computations of 3D turbulent flow in the inlet and outlet conduits of both front-positioned and rear-positioned pit tubular pump systems are completed by the help of FLUENT, respectively. The interior flow fields and hydraulic losses of the conduits are computed, and based on which comparisons among different optimum schemes are accomplished. (2) Model tests of transparent conduit are conducted for the optimized inlet and outlet conduits of the front-positioned and rear-positioned pit tubular pump systems, respectively. The flow patterns in conduits are observed and the hydraulic losses are measured. The test results are consistent with the computational results.(3) Preliminary comparison and analysis between the front-positioned and the rear-positioned pit tubular pump system have been brought to success.(4) The pump systems efficiency of the front-positioned and rear-positioned pit tubular pump systems are predicted based on the test results.The conclusions obtained from the research of the front-positioned and rear-positioned pit tubular pump systems in this paper are as follows:(1) Pit tubular pump system has excellent hydraulic performance in the condition of low head, which could be chosen for a low head pumping station.(2) Comparing with the rear-positioned pit tubular pump system, the conduit hydraulic losses of the front-positioned pit tubular pump system is lower and its efficiency is higher.(3) The shapes of optimized outlet conduits of the front-positioned and rear-positioned pit tubular pump systems could be designed to be gently upward, so as the conduit bottom elevation of the exit section could be increased while the height of wing wall could be decreased, and the civil engineering investment could be saved.

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CLC: > Industrial Technology > Hydraulic Engineering > Water control,hydraulic structures > Water, water diversion project > Pumping station
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