Experimental study of corner separation and unsteady characteristics in linear compressor cascades with and without sweeping jet actuator

IF 5.4 2区工程技术 Q1 ENGINEERING, AEROSPACE

Propulsion and Power Research Pub Date : 2024-09-01 DOI:10.1016/j.jppr.2024.05.003

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引用次数: 0

Abstract

Sweeping jet actuator (SJA) has been widely applied for active flow control in open flows. In this paper, the SJA character in compressor cascade and its performance for separation control in inner flows are discussed. Time-averaged and transient flow field measurement, together with visualization methods are utilized. It is found that endwall effects are important for both SJA behaviors and SJA performance for separation control in compressor cascades. There is a maximum of 12.7% total pressure loss reduction with SJA placed near the separation position, close to the endwall and under appropriate flowrate. The characteristic frequencies in the flow field contribute to the capture of influence regions of vortices and excitation jets. Two concentrated shedding vortices and SJA jets impact region helped to judge that SJA energizes low momentum fluids in a large region and matches the high loss core well. To be concrete, the flow separation control mechanism of SJA lies on the interruption of the blade suction surface boundary layer development and the restriction of the lifting of the boundary layer from endwall towards blade suction surface.

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带和不带扫掠射流致动器的线性压缩机级联中的转角分离和不稳定特性的实验研究

横扫射流致动器（SJA）已被广泛应用于开式流动中的主动流量控制。本文讨论了压缩机级联中的 SJA 特性及其在内流分离控制中的性能。本文采用了时均流场测量和瞬态流场测量以及可视化方法。研究发现，端壁效应对于压缩机级联中的 SJA 行为和 SJA 分离控制性能都很重要。将 SJA 放置在分离位置附近、靠近端壁和适当流速的情况下，总压力损失最多可减少 12.7%。流场中的特征频率有助于捕捉涡流和激波射流的影响区域。两个集中脱落的漩涡和 SJA 喷射影响区域有助于判断 SJA 在较大区域内激发了低动量流体，并与高损耗核心很好地匹配。具体而言，SJA 的分流控制机制在于阻断叶片吸入面边界层的发展，限制边界层从端面向叶片吸入面的抬升。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Propulsion and Power Research Multiple-

CiteScore

7.50

自引率

5.70%

发文量

期刊介绍： Propulsion and Power Research is a peer reviewed scientific journal in English established in 2012. The Journals publishes high quality original research articles and general reviews in fundamental research aspects of aeronautics/astronautics propulsion and power engineering, including, but not limited to, system, fluid mechanics, heat transfer, combustion, vibration and acoustics, solid mechanics and dynamics, control and so on. The journal serves as a platform for academic exchange by experts, scholars and researchers in these fields.