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| 1 | Effect of the protrusion shape on gas ingestion of two sealing structures显示文摘The windage loss caused by protrusion in a rotor–stator cavity has been studied in detail,and there are abundant fitting formulas that have been summarized to calculate the moment coefficients.Some other theorists have emphasized its effect on the sealing efficiency,proposing that installation of protrusion could alleviate gas ingestion.However,the protrusion shape which is an influential factor on the sealing efficiency has not been focused in previous research.Using the experimental method of measuring CO2 volume fraction,cavity pressure,and power consumption,we investigated the effects of several typical protrusion shapes on various parameters for two sealing structures,in order to obtain the optimal shape.Results showed that a variation of the protrusion shape had little impact on the static pressure,but the total pressure and the sealing efficiency increased in different degrees.Furthermore,even though the hexagon shape resulted in the highest sealing efficiency,we observed that the drop shape had the best overall performance in all of the eight models,which could result in higher efficiency of the turbine cavity.The combination of a radial seal structure and protrusion could improve sealing efficiency better. | Zeyu WU Xiang LUO Jianqin ZHU Hang CHEN Jiahua LIU | 2021 | Chinese Journal of Aeronautics2021，34，4： | 1 |
| 2 | 微型超高速旋转盘腔流动与换热规律研究显示文摘通过数值模拟方法研究了带周向环罩的微型超高速旋转盘腔的流动与换热规律,盘腔的半径为4mm,转速为2×10^(5)~1×10^(6)r/min。结果表明:超强离心力及其衍生浮升力并没有给微型旋转盘腔带来与常规盘腔不同的流动结构,但是超强离心力及其衍生浮升力引起的粘性耗散效应导致旋转盘高半径处发生换热恶化现象,周向环罩的存在则进一步加剧了该现象。在高旋转雷诺数和低转盘过余温度工况下,强离心力及其衍生浮升力引起的粘性耗散效应更加显著,而周向环罩的影响相对弱化。 | 赵熙 刘剑宇 全永凯 | 2023 | 推进技术2023，44，9： | 0 |
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