Propulsive jet influence on generic launcher base flow

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• 作者：S. Stephan ; J. Wu ; R. Radespiel
• 关键词：Jet simulation ; Base flow ; Afterbody flow ; Generic rocket ; Launcher ; Unsteady pressure fluctuations
• 刊名：CEAS Space Journal
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：7
• 期：4
• 页码：453-473
• 全文大小：2,369 KB
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• 作者单位：S. Stephan (1)
  J. Wu (1)
  R. Radespiel (1)
  
  1. Institute of Fluid Mechanics, Technische Universit盲t Braunschweig, Hermann-Blenk-Str. 37, 38108, Braunschweig, Germany
  
• 刊物类别：Engineering
• 出版者：Springer Wien
• ISSN：1868-2510

文摘

Afterbody flow phenomena represent a significant source of uncertainties in the design of a launcher. Therefore, there is a demand for measuring such flows in wind tunnels. For propulsive jet simulation a new jet facility was integrated into a hypersonic/supersonic wind tunnel. The jet simulation resembles the generic model of a staged rocket launcher. The design and the qualification of the facility are reported. This includes measurements of pressure, temperature and Mach number distribution. Pressure and Schlieren measurements are conducted in the wake of the generic launcher. The unsteady pressure characteristics at the generic rocket base and fairing are analyzed for supersonic and hypersonic freestream. The influence of the under-expanded jet is reported and the jet temperatures are varied. On the base fluctuations at a Strouhal number around 0.25 dominates supersonic freestream flows. Additionally, a fluctuation level increase on the base is observed for Strouhal numbers above 0.75 in hypersonic flow regime, which is attributed to the interactions of wake flow and jet. Keywords Jet simulation Base flow Afterbody flow Generic rocket Launcher Unsteady pressure fluctuations