垂直着陆发射器后推进着陆燃烧的空气动力特性

IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL Experiments in Fluids Pub Date : 2024-07-18 DOI:10.1007/s00348-024-03851-8
Ansgar Marwege, Ali Gülhan
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引用次数: 0

摘要

在欧洲资助的 H2020 项目 RETALT(反向推进辅助着陆技术)框架内,对垂直下降和着陆发射器的非稳定空气动力学进行了研究。本文介绍了在科隆德国航天中心的科隆垂直自由喷气设施中测试的着陆燃烧实验数据。着陆燃烧是通过与风洞自由流相对的加压空气冷气流进行模拟的。将几种喷射条件下的测试结果与无主动喷射的结果进行了比较。对 Schlieren 记录进行了适当的正交分解,对其时间历程进行了频谱分析,并与压力测量中的频率进行了比较。结果发现,主要频率在 0.8 马赫时最强。特别是发现斯特劳哈尔数为 0.2 时的频率最为主要。如果发动机处于工作状态,主导频率的强度会降低。在着陆机动过程中,归一化的均方根压力波动在 0.1 到 0.3 之间。此外,稳定流特征与环境压力比和动量通量比关系良好。亚音速逆推进流场的不稳定流场动力学很可能与超音速喷流中的大尺度湍流结构有关,从而引发大尺度压力波动并改变整个流场。
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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Aerodynamic characteristics of the retro propulsion landing burn of vertically landing launchers

In the frame of the European funded H2020 project RETALT (retro propulsion-assisted landing technologies), the unsteady aerodynamics of vertically descending and landing launchers have been investigated. In this paper, experimental data of the landing burn tested in the Vertical Free-Jet Facility Cologne at DLR in Cologne are presented. The landing burn was simulated with a cold gas jet of pressurized air opposing the wind tunnel free stream. Tests with several jet conditions were compared to results without active jet. Proper orthogonal decomposition of schlieren recordings and spectral analyses of their time histories are performed and are compared to frequencies in pressure measurements. Dominant frequencies were found, which are strongest at Mach 0.8. Especially, a Strouhal number of 0.2 was found to be most dominant. The intensity of the dominant frequencies can be lowered if the engine is active. The normalized root mean square pressure fluctuations are between 0.1 and 0.3 during the landing maneuver. Additionally, the steady flow features scale well with the ambient pressure ratio and the momentum flux ratio. The unsteady flow field dynamics of the subsonic retro propulsion flow field can likely be linked to large-scale turbulent structures in the supersonic jet, triggering large-scale pressure fluctuations and altering the overall flow field.

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来源期刊
Experiments in Fluids
Experiments in Fluids 工程技术-工程:机械
CiteScore
5.10
自引率
12.50%
发文量
157
审稿时长
3.8 months
期刊介绍: Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.
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