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http://dx.doi.org/10.5139/JKSAS.2015.43.8.677

Flow Visualization by Light Emission in the Post-chamber of Hybrid Rocket  

Park, Kyung-su (The 7th(Aircraft) R&D Institute, Agency for Defense Development)
Choi, Go Eun (Department of Aerospace Engineering, Konkuk University)
Lee, Changjin (Department of Aerospace Engineering, Konkuk University)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.43, no.8, 2015 , pp. 677-683 More about this Journal
Abstract
Hybrid rocket combustion displays low frequency instability(LFI, 10~30Hz) at a certain condition. Vortex shedding in the post-chamber is suspected to cause the occurrence of LFI. This study focused on the visualization of flow image using light emissions from high temperature combustion gas. Results shows that combustion pressure oscillates at a frequency of about 18 Hz, which is in phase with oscillations of light emission. Since LFI is not a property of thermo-acoustic instability, this result suggested there exists a physical coupling of pressure fluctuations with light emissions proportional to chemical reaction. Also POD analysis shows that dominant symmetric spatial modes in the stable combustion shift suddenly into asymmetric spatial pattern with the appearance of LFI. Especially, the appearance of mode 3 is a typical change of flow dynamics in unstable combustion representing a rotational fluid motions associated with vortex shedding.
Keywords
Low Frequency Instability; Post-Chamber; Light Emission Image; POD analysis;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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