REG NASA-LLIS-6347-2012 Space Shuttle Program Protuberance and Cavity Induced Environments.pdf

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1、Public Lessons Learned Entry: 6347 Lesson Info: Lesson Number: 6347 Lesson Date: 2011-6-8 Submitting Organization: JSC Submitted by: Jene Richart Subject: Space Shuttle Program Protuberance and Cavity Induced Environments Abstract: Protuberances and cavities can have a significant impact on both the

2、 structural and thermal loads of a spacecraft. The outer mold line (OML) of future spacecraft should be as clean as possible, and all protuberances and cavities should be eliminated or minimized. Definition of induced design environments for the Space Shuttle Vehicle presented a significant technica

3、l challenge when considering that in order to properly establish them, there was a need to not only define the detailed surface pressure distributions on protuberances and cavities, but also the aeroheating environment and the dynamic or fluctuating pressure field generated by these geometric featur

4、es. Further, the presence of these protuberances and cavities generate effects on the near flow field as well as on surrounding surfaces. The Space Shuttle Program (SSP) embarked on the definition of these induced environments through analytical methods, subscale ground test of the mated vehicle as

5、well as component level, and also numerical simulations. These efforts extended throughout the SSP life due to changes in protuberances (elimination and/or geometric shape changes to mitigate debris generation) or improvements in the methods (experimental and numerical) to better define design envir

6、onments and reduce uncertainties. Cavities, in general, didnt change. At present, the accurate definition of induced design environments for protuberances and cavities remains a technical challenge even though significant advances in ground testing and numerical simulation models have occurred. Desc

7、ription of Driving Event: N/A Lesson(s) Learned: See attached document Recommendation(s): See attached document Evidence of Recurrence Control Effectiveness: N/A Documents Related to Lesson: Protuberance and Cavity Induced Environments Lessons Learned Document Click here to download communication do

8、cument. Mission Directorate(s): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/A Additional Key Phrase(s): Additional Categories.Environment Additional Categories.Hardware Additional Categories.Launch Vehicle Additional Categories.Risk Management/Assessment Additional Categories.Test & Verification Additional Info: Approval Info: Approval Date: 2012-08-22 Approval Name: mbell Approval Organization: HQ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-