Closed-loop active flow control of a non-steady flow field in a highly-loaded compressor cascade

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• 作者：M. Staats ; W. Nitsche ; S. J. Steinberg ; R. King
• 关键词：Active flow control ; Linear compressor cascade ; Non ; steady compressor flow ; Iterative learning controller
• 刊名：CEAS Aeronautical Journal
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：8
• 期：1
• 页码：197-208
• 全文大小：
• 刊物主题：Aerospace Technology and Astronautics;
• 出版者：Springer Vienna
• ISSN：1869-5590
• 卷排序：8

文摘

The provision of secure compressor operation under circumstances of a pulsed detonation engine is crucial for the success of pressure gaining combustion processes for turbo machinery applications. This paper discusses active flow control as a possible solution to approach this challenge. The presented experiments were conducted on a highly loaded low speed linear compressor stator cascade operated at \(Re=600{,}000\) and \(Ma =0.07\). A choking-device which was located in the wake of the cascade simulated the non-steady outflow condition that is expected under the conditions of pressure gaining combustion. In the discussed experiments, the choking-device generated a periodic disturbance to every passage at a typical Strouhal number of \(Sr =0.03\). The flow structures of the non-steady flow field were strongly correlated to the working-phase of the choking-device. In this paper, an iterative learning controller was used to find an optimized actuation trajectory that was used for closed-loop sidewall-actuation to control the corner separation in the non-steady flow field. The iterative learning controller took advantage of the periodicity of the disturbance to calculate a non-steady actuation trajectory that optimally suppressed the impact of the choking-device on the flow. The active flow control effect was evaluated by means of static pressure rise using five hole probe measurements in the wake of one passage.