Visualization of Flow Separation Around an Atmospheric Entry Capsule at Low-Subsonic Mach Number Using Background-Oriented Schlieren (BOS)
Visualization of Flow Separation Around an Atmospheric Entry Capsule at Low-Subsonic Mach Number Using Background-Oriented Schlieren (BOS)
复制标题
使用背景导向纹影 (BOS) 实现低亚音速马赫数下大气进入舱周围流动分离的可视化
DOI：
10.2514/6.2014-2521
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
S. Murman
中科院分区：
文献类型：
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作者：
T. Mizukaki;S. Borg;P. Danehy;S. Murman
本文介绍了一种类似于阿波罗指令舱（CM）和猎户座多用途乘员飞行器（MPCV）的通用进入舱周围分离流动的可视化结果。该模型在流速高达0.4马赫、单攻角为28度的情况下进行了测试。对于使用太空舱形状飞行器的载人飞船，某些飞行操作，如发射后不久的紧急中止机动和进入最后阶段降落伞展开之前的飞行，指令舱可能以低马赫数飞行。在这些流动条件下，从胶囊的迎风和背风两侧的隔热面产生的分离流主导了胶囊下游的尾流。本文采用背景取向纹影（BOS）方法对分离尾流进行了流动显示，该方法无需其他技术所需的粒子播种，即可显示明显分离的尾流。实验结果表明，BOS具有对10（sup-5）数量级密度变化的检测能力。
This paper presents the results of visualization of separated flow around a generic entry capsule that resembles the Apollo Command Module (CM) and the Orion Multi-Purpose Crew Vehicle (MPCV). The model was tested at flow speeds up to Mach 0.4 at a single angle of attack of 28 degrees. For manned spacecraft using capsule-shaped vehicles, certain flight operations such as emergency abort maneuvers soon after launch and flight just prior to parachute deployment during the final stages of entry, the command module may fly at low Mach number. Under these flow conditions, the separated flow generated from the heat-shield surface on both windward and leeward sides of the capsule dominates the wake flow downstream of the capsule. In this paper, flow visualization of the separated flow was conducted using the background-oriented schlieren (BOS) method, which has the capability of visualizing significantly separated wake flows without the particle seeding required by other techniques. Experimental results herein show that BOS has detection capability of density changes on the order of 10(sup-5).