NUMERICAL INVESTIGATION OF BACK FLOW ARRESTER EFFECT ON ALTITUDE TEST SIMULATOR STARTING PERFORMANCE

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FOULADI NEMATOLLAH

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Journal: Modares Mechanical Engineering Year:2017 | Volume:17 | Issue:7 Page(s): 185-196

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Title

NUMERICAL INVESTIGATION OF BACK FLOW ARRESTER EFFECT ON ALTITUDE TEST SIMULATOR STARTING PERFORMANCE

Author(s)

FOULADI NEMATOLLAH | Issue Writer Certificate

Keywords

ALTITUDE TEST SIMULATORQ1

BACKFLOW ARRESTERQ1

DIFFUSER STARTING TIMEQ1

COMPUTATIONAL FLUID DYNAMICSQ1

Abstract

During transient phase of motor burning in an ALTITUDE TEST SIMULATOR, the low momentum exhaust combustion gases could not establish supersonic flow in the exhaust diffuser. This leads to a reverse flow of the exhaust gases into the vacuum chamber through the annular gap between nozzle and diffuser walls. This spoils the vacuum in the chamber and it is potentially dangerous for measurement instruments inside the vacuum chamber. In this research, at first, the physics of the flow at initial transient phase of motor burning is investigated numerically and the backflow phenomenon is illustrated. Then, the influences of BACKFLOW ARRESTER (BFA) in variations of vacuum chamber pressure and temperature are studied at the transient starting phase. It has been found that applying BFA to decrease the backflow to the vacuum chamber has no significant effect on starting time of the diffuser but it has strong effect on peak pressure and temperature reduction of the vacuum chamber. Also, it is found that reaching steady condition in vacuum chamber is delayed with this instrument. However; using one-way BACKFLOW ARRESTER of reasonable size, both the starting time of diffuser and the peak temperature of the vacuum chamber experience a strong reduction. Moreover, the vacuum chamber steady condition is accelerated with this alternative. Therefore, this device is more suitable than conventional BFA for transient starting phase of the ALTITUDE TEST SIMULATORs.

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APA: Copy

FOULADI, NEMATOLLAH. (2017). NUMERICAL INVESTIGATION OF BACK FLOW ARRESTER EFFECT ON ALTITUDE TEST SIMULATOR STARTING PERFORMANCE. MODARES MECHANICAL ENGINEERING, 17(7 ), 185-196. SID. https://sid.ir/paper/179343/en

Vancouver: Copy

FOULADI NEMATOLLAH. NUMERICAL INVESTIGATION OF BACK FLOW ARRESTER EFFECT ON ALTITUDE TEST SIMULATOR STARTING PERFORMANCE. MODARES MECHANICAL ENGINEERING[Internet]. 2017;17(7 ):185-196. Available from: https://sid.ir/paper/179343/en

IEEE: Copy

NEMATOLLAH FOULADI, “NUMERICAL INVESTIGATION OF BACK FLOW ARRESTER EFFECT ON ALTITUDE TEST SIMULATOR STARTING PERFORMANCE,” MODARES MECHANICAL ENGINEERING, vol. 17, no. 7 , pp. 185–196, 2017, [Online]. Available: https://sid.ir/paper/179343/en

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