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Validation of a Solid Rocket Motor Internal Environment Model
NTRS Full-Text: Click to View  [PDF Size: 68 KB]
Author and Affiliation:
Martin, Heath T.(NASA Marshall Space Flight Center, Huntsville, AL, United States)
Abstract: In a prior effort, a thermal/fluid model of the interior of Penn State University's laboratory-scale Insulation Test Motor (ITM) was constructed to predict both the convective and radiative heat transfer to the interior walls of the ITM with a minimum of empiricism. These predictions were then compared to values of total and radiative heat flux measured in a previous series of ITM test firings to assess the capabilities and shortcomings of the chosen modeling approach. Though the calculated fluxes reasonably agreed with those measured during testing, this exercise revealed means of improving the fidelity of the model to, in the case of the thermal radiation, enable direct comparison of the measured and calculated fluxes and, for the total heat flux, compute a value indicative of the average measured condition. By replacing the P1-Approximation with the discrete ordinates (DO) model for the solution of the gray radiative transfer equation, the radiation intensity field in the optically thin region near the radiometer is accurately estimated, allowing the thermal radiation flux to be calculated on the heat-flux sensor itself, which was then compared directly to the measured values. Though the fully coupling the wall thermal response with the flow model was not attempted due to the excessive computational time required, a separate wall thermal response model was used to better estimate the average temperature of the graphite surfaces upstream of the heat flux gauges and improve the accuracy of both the total and radiative heat flux computations. The success of this modeling approach increases confidence in the ability of state-of-the-art thermal and fluid modeling to accurately predict SRM internal environments, offers corrections to older methods, and supplies a tool for further studies of the dynamics of SRM interiors.
Publication Date: May 22, 2017
Document ID:
20170005375
(Acquired Jun 16, 2017)
Subject Category: FLUID MECHANICS AND THERMODYNAMICS; SPACECRAFT PROPULSION AND POWER
Report/Patent Number: M17-5821
Document Type: Conference Paper
Publication Information: (SEE 20170005291; 20170005298)
Meeting Information: JANNAF Propulsion Meeting; 64th; 22-25 May 2017; Kansas City, MO; United States
Meeting Sponsor: Department of the Army; Washington, DC, United States
Department of the Navy; Washington, DC, United States
NASA; Washington, DC, United States
Department of the Air Force; Washington, DC, United States
Financial Sponsor: NASA Marshall Space Flight Center; Huntsville, AL, United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: RADIATIVE HEAT TRANSFER; CONVECTIVE HEAT TRANSFER; RADIANT FLUX DENSITY; THERMAL RADIATION; COMPUTATIONAL FLUID DYNAMICS; ENVIRONMENT MODELS; RADIOMETERS; INSULATION; HEAT FLUX
Availability Notes: Abstract Only
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Last Modified: June 16, 2017
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