• 한국연소학회:학술대회논문집
• /
• 한국연소학회 2015년도 제51회 KOSCO SYMPOSIUM 초록집
• /
• pp.251-255
• /
• 2015

Unsteady Shock-Induced Combustion has been studied for the past few decades since it is considered as one of the potential ways to reach supersonic flights. Experimental observations of Unsteady SIC were observed as early as 1960's. But Lehr was the first to report in detail the mechanisms of Shock-Induced Combustion experimentally. Numerical Studies on SIC were helpful in explaining the insight into the oscillatory behaviour in the mid 90's to early 2000's. Detailed reaction mechanisms is required to prediction the SIC flowfield more in detail. However at that time, very few reaction mechanisms on hydrogen-oxidation were reported. In the last decade, various number of hydrogen reaction mechanisms were reported. In this study, an attempt has been made to analyze the effect of various reaction mechanisms in an unsteady mode of Shock-Induced Combustion.

• 한국추진공학회지
• /
• 제21권2호
• /
• pp.9-17
• /
• 2017

비정상 충격파 유도연소의 주기적 압력 진동 특성을 연구하기 위하여 DMD 방법을 적용하였다. Lehr의 충격파 유도 연소 실험을 기반으로 수치적인 연구를 수행하였다. Lehr의 실험을 4 수준의 격자를 이용하여 수치적으로 모사하였으며, FFT 결과로부터 430-435 kHz의 주파수가 계산되었다. 실험 결과는 약 425 kHz로 해석 결과와 유사한 것을 확인하였다. FFT 해석에서 도출되지 않은 저주파 특성을 파악하기 위해 dynamic mode decomposition (DMD) 방법을 적용하였다. 여러 가지 모드 주파수가 계산되었고, 연소불안정 평가 인자 중 하나인 damping coefficient를 도출하여 안정/불안정성을 평가하였다.