Abstract

Detailed flow field and heat transfer characteristics developed in a row of three co-rotating dual swirling impinging flames have been investigated experimentally as well as numerically. Impingement heat transfer and pressure distribution has been studied experimentally at different separation distances and inter-jet spacings. Inverse heat conduction procedure (IHCP) has been used for estimating heat fluxes on the front side of impingement plate. Turbulence induced mixing results in strong interactions amongst adjacent flames causing deflections of inner flames of the burners situated at sides of central burner. Numerical simulation predicted formation of asymmetric recirculation zones for side flames. Symmetric interactions taking place for central flame produced two equal recirculation lobes for central flame. Behavior of central inner flame has been observed to be dependent on the value of inter-jet spacing used. Suppression of central inner flame tend to occur at higher inter-jet spacings due to recirculating products. Impingement pressure distribution is observed to be consistent with the heat flux distribution. Averaged heat fluxes registered at the impingement plate due to the central flame are higher in magnitude to those pertaining to each of the side flames.

中文翻译：

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一排三个共同旋转的撞击火焰的实验和计算分析

摘要

已经通过实验和数值研究了在连续三个同向旋转的双涡旋撞击火焰中形成的详细的流场和传热特性。已经在不同的分离距离和喷嘴间的间距上对冲击传热和压力分布进行了实验研究。逆导热程序（IHCP）已用于估算冲击板正面的热通量。湍流引起的混合导致相邻火焰之间的强烈相互作用，从而导致位于中央燃烧器侧面的燃烧器的内部火焰发生偏转。数值模拟预测了侧面火焰的不对称回流区的形成。中央火焰的对称相互作用产生了两个相等的中央火焰再循环瓣。已经观察到中心内部火焰的行为取决于所使用的喷射间隔的值。由于再循环产品的缘故，中央内部火焰的抑制往往会在较高的喷嘴间距处发生。观察到冲击压力分布与热通量分布一致。