Investigation of the starting process in a Ludwieg tube
Investigation of the starting process in a Ludwieg tube
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路德维格管启动过程的研究
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
R. Radespiel
中科院分区：
文献类型：
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作者：
T. Wolf;M. Estorf;R. Radespiel
高超声速路德维希管布伦瑞克（HLB）是一种阀控风洞，设计马赫数Ma = 5.9，雷诺数范围从2.5 × 106到2.5 × 107 1/m。间歇工作原理意味着流动的不稳定开始，这导致适合测量的时间范围的延迟以及不同于稳定流动条件的热负荷。本文对起动过程进行了数值模拟。它确定流动的开始是否导致模型表面的显著温度升高，这反过来又影响测量期间收集的结果。数值模拟了阀开度等两个工况点的HLB流场。计算了试验段内双曲面/喇叭形结构的非定常绕流，其中包括表面加热。对于层流，它被发现，由于启动过程的持续时间短，没有显着的模型加热影响测量时间期间获得的结果。
The hypersonic Ludwieg tube Braunschweig (HLB) is a valve-controlled wind tunnel that has been designed for a Mach number of Ma = 5.9 and a Reynolds number range from 2.5 × 106 up to 2.5 × 107 1/m. The intermittent working principle implies an unsteady onset of flow, which leads to a delay of the time frame suitable for measurements as well as to heat loads different from steady flow conditions. This work numerically simulates the starting process. It determines whether the onset of flow leads to a significant temperature rise in the model surface which in turn impacts results gathered during measurement time. The flow field in the HLB is numerically rebuilt for two operating points including valve opening. The non-stationary flow around a hyperboloid/flare configuration in the test section is calculated for one operating point including surface heating. For laminar flow it is found that due to the short duration of the starting process no significant model heating affects results obtained during measurement time.