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Yoo, Chun Sang
Combustion and Propulsion Lab.
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A DNS Study of Ignition Characteristics of a Lean PRF/Air Mixture with Mixing Layer under RCCI Conditions

Alternative Title
RCCI 조건하에서 혼합층을 지닌 희박 PRF/공기 혼합물의 점화에 관한 직접수치모사 연구
Yu, Gwang HyeonLuong, Minh BauChung, Suk HoYoo, Chun Sang
Issued Date
55회 한국연소학회 춘계학술대회
The ignition characteristics of a lean PRF/air mixture with a mixing layer under reactivity controlled compression ignition (RCCI) conditions are investigated using 2-D direct numerical simulation with a 116-species PRF reduced mechanism. To account the compression heating and expansion cooling effects by piston motion, the compression heating/cooling model is adopted. For RCCI combustion, iso-octane and n-heptane are chosen as two different fuels which have low and high reactivity, respectively. The effect of the mixing layer developed by direct injection on the ignition is investigated. It is found that the first low temperature combustion, 1st stage ignition, occurs at the mixing layer, and it becomes flame and propagate into richer mixture fraction. The high temperature ignition kernels formed at n-heptane region and rapidly expanded toward both leaner and richer mixture fraction regions. The flame continued moving into leaner mixtures and, finally, the end-gas autoignition occurs. From the results, it is found that the mixing layer affects the development of low temperature combustion and subsequently the high temperature combustion.


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