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http://dx.doi.org/10.5139/JKSAS.2022.50.5.339

Unsteady Pressure Oscillations of Liquefied Paraffin Wax Combustion in Hybrid Rocket  

Hyun, Wonjeong (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.50, no.5, 2022 , pp. 339-347 More about this Journal
Abstract
The post chamber in hybrid rocket is installed to induce additional increase in combustion enthalpy by allowing continuous burning of the liquefied fuels. When paraffin wax fuel is used, unsteady pressure oscillations are observed only at the beginning of combustion. This study intends to investigate the effect of additional combustion of liquefied fuel droplets on the occurrence of unsteady pressure fluctuations. For this, the combustion in post-chamber was visualized and image analysis using POD(Proper Orthogonal Decomposition) technique was performed. In addition, the hypothesis was proposed on the occurrence of unsteady pressure oscillations by identifying the modes including the behavior of droplets through mode reconstruction. Conducting a series of combustion tests, the amount of liquefied fuel flowing into the post chamber and the generation of fuel droplets were controlled. Also, the changes in frequency characteristic of unsteady pressure oscillation were monitored. As a result, the unsteady pressure oscillations observed in paraffin wax combustion were the result of additional combustion of fuel droplets generated in the post chamber.
Keywords
Visualization; Post Chamber; Unsteady Combustion Pressure Oscillation; Fuel Droplet; Additional Combustion;
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Times Cited By KSCI : 1  (Citation Analysis)
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