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Development of Efficient Bulb Turbines

Author: YanShiJie
Tutor: HanFengQin
School: South China University of Technology
Course: Fluid Machinery and Engineering
Keywords: Bulb turbine On-cam Design methord Numerical simulation Efficiency
CLC: TK733.8
Type: Master's thesis
Year: 2011
Downloads: 148
Quote: 1
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Abstract


So far, the best combination of the guide vane opening aG and the runner vane angleΦR for the on-cam operation of an adjustable-vanes turbine at each given nDH and QDH was determined experimentally by the expensive model test of high accuracy. On the other hand, the reliability of the numerical prediction of the on-cam operation with the flow analysis is steadily increasing helped by the progress of 64-bit machines. To predict the optimum combination of the guide vane opening aG and the runner vane angleΦR and performance description, the interfaces between the parts of the bulb turbine are necessary, but those interfaces are not exist in the actual case. The paper, basing on above questions, presents an approach of division of the interfaces which reduces the numerical loss of the flow through the interface greatly, by it increasing the reliability of the numerical prediction of on-cam openings of guide vanes and runner vanes.The traditional definition of on-cam operating condition of bulb turbine is defined as the optimal operating state of combination of the outflow angle of guide vane and the inflow angle of runner vane,and at this time traditional design methord generally believed that when the outflow of the runner along the axial with no swirl which can achieve the best efficiency. But by numerical simulation of the bulb turbine which designed by the methord based on the normal flow, found that when the hydraulic loss of turbine draft tube was the minimum can get the optional efficiency, and at this time the outflow of runner was not normal most.,which have a certain swirl will benefit the energy recovery of the draft tube, it will help improve the overall efficiency of the turbine. The improvement of the energy recovery property of the draft tube makes a greater contribution to improve overall efficiency. Based on the above findings, this paper proposes the innovative design methord of the bulb turbine which give the energy distribution in the trailing edge which made the flow in draft tube was the opimum to instead of the previous methord.In the specific design process, in order to verify the accuracy and reliability of geometrical analisis, the research used the same distribution rule of discharge as the numerical simulation result in the interfaces. And we used the three points design methord which mean the design runner vane angle was the middle one and used the optional one and the maximum one to check in,to ensure the design runner vane angle was expected.In order to verify the hydraulic performance of the innovative design is good or bad, the paper proceed the three-dimensional numerical simulation of the whole bulb turbine to get the on-cam operating point through the energy budget. Through the system analysis in the runner and draft tube speed and energy distribution, verified innovation design method is feasible. The comparison of numerical simulation and physical test results,which provides a technical basis and support for the numerical simulation.

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CLC: > Industrial Technology > Energy and Power Engineering > Water, energy, hydraulic machinery > Hydraulic prime mover,turbine > The counterattack hydraulic prime mover > Tubular Turbine
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