Effect mechanism of pulsating flow on unsteady aerodynamic performance of turbine
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摘要: 以周期性脉动来流模拟旋转爆震燃烧室出口流场,研究了来流脉动幅值和频率对GE-E3高压涡轮级非定常内流特性的影响机理。结果表明:来流脉动幅值的增加会加强涡轮内部流场的非定常性,放大流场参数的时空差异;随着脉动频率的增加,涡轮内部流场的脉动幅值逐渐减弱,不同动叶时均载荷分布趋于一致。在来流脉动频率为5 244 Hz的条件下,来流脉动系数逐步增加到04时,涡轮效率降低1399%;而在来流脉动系数为03的条件下,来流脉动频率逐步增加到10 488 Hz时,涡轮效率降低1557%。来流脉动幅值和频率的增加会加剧端壁二次流动和叶栅流动分离,并使得动叶进气攻角偏离设计状态,降低涡轮的工作效率。Abstract: A periodic pulsating incoming flow was used to simulate the flow field at the outlet of a rotating detonation combustor. The effect mechanism of the amplitude and frequency of the incoming pulsation on the unsteady internal flow characteristics of the GE-E3 high pressure turbine stage was studied. Results indicated that the increase of the pulsation amplitude of the inflow could enhance the unsteadiness of the internal flow field and amplify the difference of the parameters in the internal flow field in time and space. With the increase of the pulsation frequency, the pulsation amplitude of the internal flow field gradually weakened, and the distribution of the time averaged loading of the blade was inclined to be consistent. Under the condition that the incoming pulsation frequency was 5 244 Hz, when the pulsation coefficient increased to 04, the turbine efficiency was reduced by 1399%; under the condition that the incoming pulsation coefficient was 03, when the pulsation frequency increased to 10 488 Hz, the turbine efficiency was reduced by 1557%. Increased pulsation amplitude and frequency could enhance the endwall secondary flow and cascade flow separation, make the inlet attack angle of blades deviate from the design state, and reduce the turbine working efficiency.
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