予混合火炎の局所燃焼速度と火炎伸長の関係〔熱工学, 内燃機関, 動力など〕

概要

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A mechanism of changing the local burning velocity of a stretched premixed flame independent of change in the local heat release rate per unit flame surface area is clarified. Based on the mechanism, the dependence of the local burning velocity on the local fuel consumption rate and the local flame stretch is derived mathematically for a stationary flame of the Lewis number of unity, by considering the mass ballance of the fuel entering and consumed in a stream tube which crosses the flame surface. Unlike the equations theoretically derived so far, the proposed equation is valid without the limitation of small stretch rate and small flame curvature, and therefore it can predict the local burning velocity of the stretched flame of the previous numerical study (Waku et al., 1997) very well for a wide range of flame stretch.
1997-10-25