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Details of Side Load Test Data and Analysis for a Truncated Ideal Contour Nozzle and a Parabolic Contour NozzleTwo cold flow subscale nozzles were tested for side load characteristics during simulated nozzle start transients. The two test article contours were a truncated ideal and a parabolic. The current paper is an extension of a 2009 AIAA JPC paper on the test results for the same two nozzle test articles. The side load moments were measured with the strain tube approach in MSFC s Nozzle Test Facility. The processing techniques implemented to convert the strain gage signals into side load moment data are explained. Nozzle wall pressure profiles for separated nozzle flow at many NPRs are presented and discussed in detail. The effect of the test cell diffuser inlet on the parabolic nozzle s wall pressure profiles for separated flow is shown. The maximum measured side load moments for the two contours are compared. The truncated ideal contour s peak side load moment was 45% of that of the parabolic contour. The calculated side load moments, via mean-plus-three-standard-deviations at each nozzle pressure ratio, reproduced the characteristics and absolute values of measured maximums for both contours. The effect of facility vibration on the measured side load moments is quantified and the effect on uncertainty is calculated. The nozzle contour designs are discussed and the impact of a minor fabrication flaw in the nozzle contours is explained.
Document ID
Document Type
Conference Paper
Ruf, Joseph H. (NASA Marshall Space Flight Center Huntsville, AL, United States)
McDaniels, David M. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Brown, Andrew M. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 25, 2013
Publication Date
July 26, 2010
Subject Category
Spacecraft Propulsion and Power
Report/Patent Number
Meeting Information
AIAA Joint Propulsion Conference(Nashville, TN)
Distribution Limits
Work of the US Gov. Public Use Permitted.

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