Numerical Analysis on Thermal Characteristics of Underwater Stream Turbine in Non-Design Condition

doi:10.3969/j.issn.1000-1093.2014.09.020

Abstract

Abstract: To study thermal-power conversion law of underwater stream turbine in non-design condition, a calculation model of nozzle， turbine cascade and energy loss in turbine stage is established by considering adiabatic exponent variation along with temperature and heating effect of fluid friction and vortex losse. A thermal process simulation of an underwater stream turbine in the variation of temperature at nozzle entrance and pressure ratio is realized by use of the calculation program based on the established model. Results show that the simulation curves consist with thermal-power conversion law in non-design condition well, which validates the efficienceness of the model and simulation. For the studied engine, under changing pressure ratio, the velocity factor of nozzle determines the variation of inner efficiency of turbine engine and its wheel power, and the speed of nozzle exit working substance determines the variation of effective power of turbine engine and its wheel work. The proposed model can be seen as foundation for optimization design and control study of underwater turbine engine.

Key words: power machinery engineering, underwater vehicle, stream turbine, non-design condition, thermal characteristics, numerical analysis

CLC Number:

TJ630

ZHANG Fang-fang， ZHANG Zhen-shan, LIANG Wei-ge，WANG Zheng-li. Numerical Analysis on Thermal Characteristics of Underwater Stream Turbine in Non-Design Condition[J]. Acta Armamentarii, 2014, 35(9): 1466-1472.

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