Numerical investigation of flow transient phase of motor burnout in an altitude test simulator

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FOULADI NEMATOLLAH

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Journal: Modares Mechanical Engineering Year:2018 | Volume:18 | Issue:7 Page(s): 10-19

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Title

Numerical investigation of flow transient phase of motor burnout in an altitude test simulator

Author(s)

FOULADI NEMATOLLAH | Issue Writer Certificate

Keywords

Altitude test simulatorQ1

supersonic diffuserQ1

motor burnoutQ1

numerical simulationQ2

backflow arresterQ1

Abstract

In this research, the performance study of an Altitude test simulator at transient phase of motor burnout is conducted by numerical approach. Using a time dependent pressure profile of a motor in burnout phase, the unsteady exhaust flow is simulated in the main sections of the Altitude test simulator, i. e. high expansion ratio nozzle, second throat exhaust diffuser, and vacuum chamber. Present investigation shows that in spite of the high pressure starting condition of the altitude simulator, the supersonic flow in the diffuser tends to breakdown at relatively low combustion pressure in the motor terminating phase. At the breakdown condition, the nozzle exhaust hot gases directed into the vacuum chamber through the annular gap between nozzle and diffuser walls. Present simulation shows that the overall temperature of fluid in vacuum chamber is reached up to 2000 K after the motor burnout. Really, It is potentially dangerous for measurement instruments inside the vacuum chamber. Furthermore; in this research, the influences of backflow arrester (BFA) in variations of vacuum chamber temperature are studied at this transient terminating phase. It has been shown that, the BFA can decrease the exhaust streaming into the chamber in initial breakdown periods. Results show that utilizing a suitable BFA size, the safe temperature condition could be established in vacuum chamber during and after the transient terminating phase of motor.

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APA: Copy

FOULADI, NEMATOLLAH. (2018). Numerical investigation of flow transient phase of motor burnout in an altitude test simulator. MODARES MECHANICAL ENGINEERING, 18(7 ), 10-19. SID. https://sid.ir/paper/179580/en

Vancouver: Copy

FOULADI NEMATOLLAH. Numerical investigation of flow transient phase of motor burnout in an altitude test simulator. MODARES MECHANICAL ENGINEERING[Internet]. 2018;18(7 ):10-19. Available from: https://sid.ir/paper/179580/en

IEEE: Copy

NEMATOLLAH FOULADI, “Numerical investigation of flow transient phase of motor burnout in an altitude test simulator,” MODARES MECHANICAL ENGINEERING, vol. 18, no. 7 , pp. 10–19, 2018, [Online]. Available: https://sid.ir/paper/179580/en

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