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Compartment Venting Analyses of Ares I First Stage Systems TunnelCompartment venting analyses have been performed for the Ares I first stage systems tunnel using both the lumped parameter method and the three-dimensional (31)) transient computational fluid dynamics (CFD) approach. The main objective of venting analyses is to predict the magnitudes of differential pressures across the skin so the integrity of solid walls can be evaluated and properly designed. The lumped parameter method assumes the gas pressure and temperature inside the systems tunnel are spatially uniform, which is questionable since the tunnel is about 1,700 in. long and 4 in. wide. Therefore, 31) transient CFD simulations using the commercial CFD code FLUENT are performed in order to examine the gas pressure and temperature variations inside the tunnel. It was found that the uniform pressure and temperature assumptions inside the systems tunnel are valid during ascent. During reentry, the uniform pressure assumption is also reasonable but the uniform temperature assumption is not valid. Predicted pressure and temperature inside the systems tunnel using CFD are also compared with those from the lumped parameter method using the NASA code CHCHVENT. In general, the average pressure and temperature inside the systems tunnel from CFD are between the burst and crush results from CHCHVENT during both ascent and reentry. The skin differential pressure and pressure inside the systems tunnel relative to freestream pressure from CHCHVENT as well as velocity vectors and streamlines are also discussed in detail.
Document ID
20090034248
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Wang, Qunzhen (ATK Launch Systems Brigham City, UT, United States)
Arner, Stephen (ATK Launch Systems Brigham City, UT, United States)
Date Acquired
August 24, 2013
Publication Date
August 2, 2009
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
M09-0512
Meeting Information
Meeting: 45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit
Location: Denver, CO
Country: United States
Start Date: August 2, 2009
End Date: August 5, 2009
Sponsors: Society of Automotive Engineers, Inc., American Society of Mechanical Engineers, American Society for Engineering Education, American Inst. of Aeronautics and Astronautics
Funding Number(s)
CONTRACT_GRANT: NNM07AA75C
Distribution Limits
Public
Copyright
Public Use Permitted.

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