This article explores the relationship between stall types and speed ratios in contra-rotating boost stages, discovering stationary circumferential stall cells and dual stall cell phenomena, and examines the relationship between stall characteristics and inlet distortions. These stall characteristics of counter-rotating boost stages are markedly different from the single stall patterns of traditional compressor rotor-stator structures, highlighting the complexity of the flow field in counter-rotating stages. The study uses the experimental methods to investigate different speed ratios under both uniform and distorted inlet conditions, conducting both accelerating and decelerating stall tests, with each stall condition analyzed using data from 25 s. The main focus is on the stall types, frequencies, and development patterns under different distortion conditions at various speed ratios, filling a research gap in counter-rotating boost stages. It explores the unstable flow characteristics of counter-rotating boost stages under distorted conditions, particularly the stall disturbance characteristics and pressure fluctuation patterns at the blade tip during stall entry and recovery under distortions. Comparing distortions with uniform inlet conditions provides an intuitive understanding of the influence of various types of distortions on wall pressure and stall in the flow field. Researchers can use this knowledge to design casings or blowing devices to suppress stall disturbances, thereby achieving stall prevention and enhancing stability.

中文翻译：

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入口畸变下对转转子复杂非定常流动研究

本文探讨了对转增压级中的失速类型和速比之间的关系，发现了静止圆周失速单元和双失速单元现象，并研究了失速特性和入口变形之间的关系。对转增压级的这些失速特性与传统压缩机转子-定子结构的单失速模式明显不同，凸显了对转级流场的复杂性。该研究采用实验方法研究均匀和扭曲入口条件下的不同速比，进行加速和减速失速测试，并使用 25 s 的数据分析每个失速条件。主要研究了不同速比下不同畸变条件下的失速类型、频率和发展规律，填补了反向旋转升压级的研究空白。研究了扭曲条件下反向旋转增压级的不稳定流动特性，特别是扭曲下失速进入和恢复过程中叶尖的失速扰动特性和压力脉动模式。将畸变与均匀入口条件进行比较，可以直观地了解各种类型的畸变对流场壁压和失速的影响。研究人员可以利用这些知识来设计外壳或鼓风装置来抑制失速扰动，从而实现失速预防并增强稳定性。