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不同来流附面层厚度下容腔泄漏流对围带式静叶性能影响 被引量:2
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作者 孔晓治 黄天硕 +2 位作者 刘育心 王成泽 陆华伟 《航空动力学报》 EI CAS CSCD 北大核心 2023年第1期184-196,共13页
基于验证的数值模拟方法,针对带容腔结构的围带式静叶,研究了容腔泄漏流对其性能的影响以及容腔泄漏流与主流的相互干涉作用。在不同的来流附面层厚度下,探讨了叶栅二次流运动和角区分离发展情况,并通过总压损失系数和熵增系数对性能变... 基于验证的数值模拟方法,针对带容腔结构的围带式静叶,研究了容腔泄漏流对其性能的影响以及容腔泄漏流与主流的相互干涉作用。在不同的来流附面层厚度下,探讨了叶栅二次流运动和角区分离发展情况,并通过总压损失系数和熵增系数对性能变化进行评判。结果表明:附面层厚度的增加使无容腔扩压叶栅总压损失系数和熵增损失系数增加。容腔泄漏流使叶片前缘出现容腔泄漏涡,并对通道涡的发展和集中脱落涡的大小产生影响;同时容腔泄漏流加强了叶栅通道内的三维流动效应,削弱了近端壁面流体的横向偏转;随着附面层增厚,带容腔的扩压叶栅的总压损失系数和熵增损失系数变化程度不明显。 展开更多
关键词 围带式静叶 容腔 泄漏流 角区分离 附面层
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Influence of Cavity Leakage flow on Corner Separation in a Shrouded Stator Cascade
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作者 KONG Xiaozhi huang tianshuo +2 位作者 LIU Yuxin LU Huawei WANG Long 《Journal of Thermal Science》 SCIE EI CAS CSCD 2023年第1期351-365,共15页
The impacts of the cavity leakage flow on the shrouded stator aerodynamic performance were investigated by modelling the annular cascade mainstream with the seal cavity flow path based on the validated numerical metho... The impacts of the cavity leakage flow on the shrouded stator aerodynamic performance were investigated by modelling the annular cascade mainstream with the seal cavity flow path based on the validated numerical method.Meanwhile,the interactions between the cavity leakage and the mainstream were also determined in the current study.The development of hub corner separation under the action of leakage was discussed and the total pressure loss coefficient as well as the entropy-based loss coefficient was employed to evaluate the performance changes at different seal clearances and cavity rotational speeds.The results show that the cavity leakage flow induces a new vortex near the blade leading edge and plays an important role in the development of passage vortex and the size of concentrated shedding vortex.By increasing the seal clearance with more cavity leakage flow rate,an increase in the pitchwise extent of the separation region under 15%span is significant and the total pressure loss in the separation core increases.In addition,with the increase of cavity rotating speed,the starting point of corner separation moves backward,reducing the size and depth of the hub corner separation.The mainstream loss reduction in combination with the entropy increase in the seal cavity causes the entropy-based loss coefficient to perform a trend of decreasing first and then increasing with the cavity speed. 展开更多
关键词 shrouded stator cavity leakage flow corner separation loss coefficient
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