Investigation of the Starting Process of a Second Throat Exhaust Diffuser in a High-Altitude Test Stand, M.Sc. Thesis Sharif University of Technology ; Farahani, Mohammad (Supervisor) ; Fouladi, Nematollah (Supervisor)
Abstract
In the present study, the effect of the diffuser inlet-to-nozzle exit area ratio (A_d/A_e ) on the gradual starting performance of a second throat exhaust diffuser has been investigated experimentally. Experiments have been carried out with four conical nozzles with different expansion ratios and considering two approaches of gradual increase and gradual decrease of nozzle chamber pressure by a high-pressure air tank. Investigations show that at high area ratios before starting the diffuser, oscillations in the pressure of the test chamber are created due to the instability of the flow at the diffuser inlet. By frequency analysis of the vacuum chamber pressure, it is observed that as A_d/A_e...
Cataloging briefInvestigation of the Starting Process of a Second Throat Exhaust Diffuser in a High-Altitude Test Stand, M.Sc. Thesis Sharif University of Technology ; Farahani, Mohammad (Supervisor) ; Fouladi, Nematollah (Supervisor)
Abstract
In the present study, the effect of the diffuser inlet-to-nozzle exit area ratio (A_d/A_e ) on the gradual starting performance of a second throat exhaust diffuser has been investigated experimentally. Experiments have been carried out with four conical nozzles with different expansion ratios and considering two approaches of gradual increase and gradual decrease of nozzle chamber pressure by a high-pressure air tank. Investigations show that at high area ratios before starting the diffuser, oscillations in the pressure of the test chamber are created due to the instability of the flow at the diffuser inlet. By frequency analysis of the vacuum chamber pressure, it is observed that as A_d/A_e...
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