Proper Orthogonal Decomposition analysis of mode switching in supersonic jets impinging on flat and corrugated plates

IF 0.7 4区工程技术 Q4 ENGINEERING, AEROSPACE

International Journal of Turbo & Jet-Engines Pub Date : 2023-08-22 DOI:10.1515/tjj-2023-0071

D. Sarangi, Ramanujam Karthik, K. Srinivasan

引用次数: 0

Abstract

Abstract Understanding the occurrence of various feedback mechanisms of an under-expanded impinging supersonic jet is a crucial task in research. The presence of several jet modes is examined in this study for the flat and corrugated impinging plate geometries. The behavior of impinging plate configurations during mode switching is investigated by varying the flow state, such as the jet Mach number. The staging behavior at various jet Mach numbers is observed using acoustic spectral plots and schlieren flow visualization. To explore the presence of various types of modes during the jet impingement due to the modification of jet Mach number, ensemble averaging and Proper Orthogonal Decomposition of schlieren images are carried out. In the majority of situations, the corrugated design shows a reduction in tonal noise and overall sound pressure level. In exceptional cases, for the corrugated plates, the enhanced overall sound pressure level is caused by the existence of axisymmetric instability (A1, A2).

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超声速射流冲击平板和波纹板模式转换的正交分解分析

摘要了解欠膨胀撞击超声速射流各种反馈机制的发生是研究中的一项关键任务。在本研究中，研究了平面和波纹撞击板几何形状的几种射流模式的存在。通过改变流动状态，如射流马赫数，研究了模式切换过程中撞击板结构的行为。使用声学频谱图和纹影流可视化观察了不同喷气马赫数下的分级行为。为了探索由于射流马赫数的改变而导致的射流冲击过程中各种模式的存在，对纹影图像进行了系综平均和适当正交分解。在大多数情况下，波纹设计显示出音调噪音和整体声压水平的降低。在特殊情况下，对于波纹板，整体声压级的增强是由轴对称不稳定性的存在引起的（A1，A2）。

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

International Journal of Turbo & Jet-Engines 工程技术-工程：宇航

CiteScore

1.90

自引率

11.10%

发文量

审稿时长

6 months

期刊介绍： The Main aim and scope of this Journal is to help improve each separate components R&D and superimpose separated results to get integrated systems by striving to reach the overall advanced design and benefits by integrating: (a) Physics, Aero, and Stealth Thermodynamics in simulations by flying unmanned or manned prototypes supported by integrated Computer Simulations based on: (b) Component R&D of: (i) Turbo and Jet-Engines, (ii) Airframe, (iii) Helmet-Aiming-Systems and Ammunition based on: (c) Anticipated New Programs Missions based on (d) IMPROVED RELIABILITY, DURABILITY, ECONOMICS, TACTICS, STRATEGIES and EDUCATION in both the civil and military domains of Turbo and Jet Engines. The　International Journal of Turbo & Jet Engines　is devoted to cutting edge research in theory and design of propagation of jet aircraft. It serves as an international publication organ for new ideas, insights and results from industry and academic research on thermodynamics, combustion, behavior of related materials at high temperatures, turbine and engine design, thrust vectoring and flight control as well as energy and environmental issues.