平板尺寸对NexGen燃烧器冲击射流换热特性的影响研究

NexGen燃烧器是美国联邦航空管理局(federal aviation administration,FAA)指定的用于动力装置防火试验的燃烧器。为了研究平板尺寸L与冲击间距Z之比(L/Z)为4、5和6的情况下对平板的温度、努塞尔数和热流分布的影响,采用商用Fluent软件模拟了NexGen燃烧器火焰射流冲击平板的过程,分析了火焰冲击平板的流场;并对不同L/Z下平板的表面温度、努塞尔数和热流的分布规律进行了研究。同时,对平板表面危险点的分布情况做出了预判,得出危险点主要集中在以平板几何中心为中心的0.15 m×0.2 m范围内。

Influence of plate size on heat transfer characteristics of impinging jet in NexGen burner

NexGen burner is the United States Federal Aviation Administration (FAA) designated for power plant fire test of the burner. In order to study plate size L and shock distance Z ratio (L / Z) for the effects of 4, 5 and 6 cases of plate temperature and Nusselt number and the heat flux distribution. The commercial software FLUENT to simulate the process of NexGen burner flame jet impinging on a flat, flame impingement plate flow field is analyzed, and the distribution law of the plate surface temperature, Nusselt number and the heat flux with different L / Z were studied. At the same time, the distribution of the dangerous points on the flat surface has been prejudged, and the danger point is mainly focused on the 0.15m*0.2m range, which is the center of the geometric center of the flat plate.