Numerical Simulation of Turbine Performance with Low Reynolds Number at High Altitude
With the future requirement for engine working at higher altitude with high performance and lower engine cost, the problem that the turbine is working at a low Reynolds number is a challenge to turbine designers. Because of the effect caused by low working Reynolds number, most of the blade boundarylayer flow is laminar or laminar-turbulence transient state, and separation may occur in the local divergent area of suction side, and this results in significant degradation in turbine performance. Aiming to promote the insight of effects caused by low Reynolds Number in gas turbine, numerical simulation has been carried out in a turbo-fan turbine. Comparison of the overall performance and flow details between working at sea-level and highaltitude state shows that the low-Re effect has a significant impact on the turbine, especially for the low pressure turbine. The efficiency of high pressure turbine decreases 2. 4 percent and low pressure turbine 4. 8 percent. Unlike the sea-level situation, in the high-altitude, more detailed analysis shows some separation at the leading edge of rotor and the trailing edge of both blade rows of high pressure turbine. Same separation phenomenon can also be found at the leading edge and the suction side of low pressure turbines rotor blade.
turbine performance low Reynolds number high altitude
YANG Lin QIAO Wei-yang LIU Jian LUO Hua-ling HOU Wei-tao
School of Power and Energy, Northwestern Polytechnical University, Xian, China
国际会议
4th International Symposium on Jet Propulsion and Power Engineering(第四届喷气推进与动力工程国际会议 ISJPPE2012)
西安
英文
140-148
2012-09-10（万方平台首次上网日期，不代表论文的发表时间）