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Study on Optimizing Flow Pattern of the Inlet and Outlet Conduit of Postpositional Bulb Tubular Pumping System

Author: YuLiHong
Tutor: LiuChao
School: Yangzhou University
Course: Water Resources and Hydropower Engineering
Keywords: Tubular Pump Bulb body Flow pattern Numerical Simulation
CLC: TV675
Type: Master's thesis
Year: 2008
Downloads: 89
Quote: 2
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Abstract


Bulb tubular pump inlet and water flow smooth and fluid, hydraulic losses, over current capacity, high device efficiency, especially for RESOURCES PLANNING works with a greater value and development potential. However, large bulb pump unit applications at home and abroad, little, just some understanding of device performance the specific bulb tubular pump station outlet conduit little. Flow channel as an important part of the large and medium-sized pumping station directly affects the device performance and the safe and reliable operation of the pumping station. Therefore, the bulb tubular pump the outlet conduit flow pattern optimization analysis, reduce hydraulic losses in the flow channel, to increase the efficiency of important guiding value. With the development of the CFD theory of technology and computer hardware and software technology, numerical simulation method has been more widely used in the pump device research. In this context, the use of three-dimensional turbulence numerical simulation method to study the optimization of bulb tubular pump out of the conduit of the flow pattern. A rear bulb tubular pumping station, for example, use the GAMBIT software to complete a three-dimensional solid modeling and unstructured model pump device Ke split, higher precision and higher quality local encryption technology entity mesh. FLUENT software in two different k-ε turbulence model based on the rear bulb tubular pump system on turbulent flow field numerical simulation. Comparison of the results of the numerical simulation and model test results obtained RNGk-ε turbulence model is more suitable in this case, so that this mathematical model is appropriate. Obtained by numerical simulation bulb tubular pump system and out of the conduit flow field: water flow straight into the conduit; conduit within a large range of flow separation and whirlpool, mainly by the guide vane outlet circulation and light bulbs body the impact, including the impact of the guide vane outlet circulation obvious. A special conduit structure - the lamp body segment and a detailed analysis of bulb tubular pump hydraulic losses calculated results show that the bulb body segment of the conduit flow is very uneven, bulb body support and tail regions there swirl and drift, the segment is the most serious of the hydraulic losses. Again for a conduit of the specific characteristics of the lamp body segments and develop specific programs optimized flow pattern. Through three-dimensional numerical simulation programs hydraulic losses, unit head and device efficiency as the objective function, a detailed analysis of the impact of the support-type line and bulb of the lamp body segments body and tail of the molded line of the outlet conduit flow pattern and device performance, and finally was be able to increase the efficiency of the optimization of the greater extent. The numerical results show that, the flow parts streamlined as possible, water resistance suffered by the smaller, the higher the efficiency of the pump device. This article research provides a reference to the actual project to improve rear bulb tubular pump efficiency.

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