Experimental Investigation of Pressure Oscillations Phenomenon in Test Chamber of High-Altitude Simulator, M.Sc. Thesis Sharif University of Technology ; Farahani, Mohammad (Supervisor) ; Fouladi, Nematollah (Supervisor)
Abstract
Depending on the geometry and nozzle pressure, increasing the ratio of the diffuser inlet area to the nozzle outlet area can lead to instability in the high-altitude simulator vacuum chamber startup process. This instability results in the formation of harmonic pressure oscillations throughout the diffuser and the vacuum chamber. In this study, a scaled down second throat diffuser with compressed air has been utilized. The performance of the diffuser has been investigated using four conical nozzles with different expansion ratios to simulate instability at area ratios of 1.27, 1.91, 4.1, and 7.81 with rapid nozzle pressure rise. Experiments were conducted by measuring wall pressures along...
Cataloging briefExperimental Investigation of Pressure Oscillations Phenomenon in Test Chamber of High-Altitude Simulator, M.Sc. Thesis Sharif University of Technology ; Farahani, Mohammad (Supervisor) ; Fouladi, Nematollah (Supervisor)
Abstract
Depending on the geometry and nozzle pressure, increasing the ratio of the diffuser inlet area to the nozzle outlet area can lead to instability in the high-altitude simulator vacuum chamber startup process. This instability results in the formation of harmonic pressure oscillations throughout the diffuser and the vacuum chamber. In this study, a scaled down second throat diffuser with compressed air has been utilized. The performance of the diffuser has been investigated using four conical nozzles with different expansion ratios to simulate instability at area ratios of 1.27, 1.91, 4.1, and 7.81 with rapid nozzle pressure rise. Experiments were conducted by measuring wall pressures along...
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