Abstract Up to the present, no studies have been published to investigate the ignition process in air heater. In this paper, spray combustion flow field during ignition process in air heater was first visualized by high-speed shadowgraph technique. High-speed shadowgraph movies and pressure data indicated that ignition-quenching–reignition phenomenon occurred during one test run. The experimental results demonstrated that combustion of the accumulated propellant mixture during a very short period led to a peak pressure at the moment of last ignition. This process caused reverse flow of flame and ethanol spray into air injector annulus, which was one of the reasons leading to local ablation of injector. In order to obtain reliable ignition, effective improvements were necessary.
Highlights First visualization of ignition transient in air heater was reported. Ignition-quenching–reignition phenomenon was observed and analyzed in detail. We explained the reason for local ablation of injector.
Study on ignition process of air/liquid oxygen/ethanol tripropellant coaxial jets in a subscale air heater
Acta Astronautica ; 162 ; 41-49
2019-05-23
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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|Experimental Study on Tripropellant Combustion
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