【摘要】 为了得到辐射能的方向分布特性,利用蒙特卡罗法,研究了定向管内壁面为不等温灰体、其底部假想圆型辐射器为黑体时,管内壁发射率、管长与半径比、管内空气流速等参数的变化对管口表面当量定向发射率的影响,计算结果表明:管长与半径比增加,管口表面较大的当量定向发射率向小角度的天顶角方向移动,空气流速仅影响当量定向发射率数值大小。更多还原

【Abstract】 To obtain directional properties of radiant energy streaming from radiant burner system, a Monte Carlo method is used to Calculate the values of equivalent directional emittance for non-isothermal gray inner surface of tube with bottom fictitious black surface, while the parameters that are varied include the emissivity of the inside wall, the depth-to-radius ratios and the air velocity inside the tube. The result shows that the polar angle of maximum equivalent directional emissivity decreases with increasing of the depth-to-radius ratio. The air velocity only affects the value of equivalent directional emittance.更多还原