环形压气机叶栅内部分离流结构分析 第一部分:近壁区分离流

1前言随着对叶轮机械研究的深入，叶轮机械内部的真实复杂流动已成为重要的研究课题。认识扩压叶栅内的流动分离和旋涡的发生、发展及相互作用，对于揭示压气机内部流动机制，改善流动结构，提高其喘振裕度，以及发展喘振控制技术都具有重要意义山。尽管人们已进行了许多研究，但尚未完整充分地认识这一复杂现象的物理现象和物理模型。对处在严重流动分离状态下的环形叶栅内部流动的研究就更为少见。本文应用油膜法显示了从约零度到二十几度多个来流攻角下，一大展弦比叶片低稠度环形压气机叶棚的表面流场。进口气流马赫数约为0．1。叶片进…

ANALYSIS OF SEPARATED FLOW STRUCTURE IN AN ANNULAR COMPRESSOR CASCADE PART 1: SEARATED FLOW ON AND NEAR BLADE SURFACES

The structures of flow and vortices, especiallyt separated flow, on and near the blade surfaces of an annular compressor cascade under different incidences have been studied based on the oil-film images obtained in an experiment. The structures of the separated flow on the blade surfaces have been given. The results indicate that there are three different separation regions, namely, the top, middle and low separation region, in the annular compressor cascade. The low region is the largest and most important one. The top one is very small. The vortices near the blade tail may concentrate, intensify and even drop off with the increase of the incidence.