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Experimental Study of the Role of Gas-Liquid Scheme Injector as an Acoustic Resonator in a Combustion Chamber  

Kim Hak-Soon (Department of Aerospace Engineering, Chosun University)
Sohn Chae-Hoon (Department of Aerospace Engineering, Chosun University)
Publication Information
Journal of Mechanical Science and Technology / v.20, no.6, 2006 , pp. 896-904 More about this Journal
Abstract
In a liquid rocket engine, the role of gas-liquid scheme injector as an acoustic resonator or absorber is studied experimentally for combustion stability by adopting linear acoustic test. The acoustic-pressure signals or responses from the chamber are monitored by acoustic amplitude. Acoustic behavior in a rocket combustor with a single injector is investigated and the acoustic-damping effect of the injector is evaluated for cold condition by the quantitative parameter of damping factor as a function of injector length. From the experimental data, it is found that the injector can play a significant role in acoustic damping when it is tuned finely. The optimum tuning-length of the injector to maximize the damping capacity is near half of a full wavelength of the first longitudinal overtone mode traveling in the injector with the acoustic frequency intended for damping in the chamber. When the injector has large diameter, the phenomenon of the mode split is observed near the optimum injector length and thereby, the acoustic-damping effect of the tuned injectors can be degraded.
Keywords
Combustion Stability; Rocket Combustor; Injector; Acoustic Test; Acoustic Damping;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By Web Of Science : 3  (Related Records In Web of Science)
Times Cited By SCOPUS : 3
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