Prediction of Payload Internal Pressure
AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA
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An analysis of the internal pressure history of sounding rocket payloads as they ascend through the atmosphere was conducted. The analysis was concerned mainly with compressible flow and included the affects of choking. Computer programs were developed that successfully predict the internal pressure from trajectory data. The programs were based on both the theoretical analysis and mathematical models of the flow rates of various venting components used in relieving the payload internal pressure. The mathematical models were developed from empirical data gathered during testing. The payload model can be set up with any combination of relief valves and air filters, and has provisions for including leaks due to doors and seals. Sample program results for several payloads are included along with the program listings.
- Fluid Mechanics