为削弱引射系统尾气对光传输的影响，依据将尾气排放到光传输区域以外的设计思路，运用数值模拟的方法，对引射系统排气管道内的流场特性及尾气射流影响区域开展了研究。通过对直管道以及弯管道内流场特性的数值分析和比较，给出了一种排气管道的结构设计方式。在给定系统出口速度的情况下，运用多组分输运模型，分别对无自然风和有侧向自然风状态下的尾气影响范围进行了分析，初步确定了尾气射流排出系统后的影响区域，并依据尾气影响区域，对管道长度及布置方式进行了研究。

In order to reduce the impact of ejector system exhausts on the optical transmission, design method of emitting exhaust gas to the outside of optical transmission area is proposed. Fluid characteristics for exhaust pipe in ejector system and the influence area of exhausted gas are studied using numerical simulation methods. Based on the comparison results of flow field characteristics of straight pipe and elbow bend pipe, design manners of exhaust pipe which satisfies the engineering requirement are proposed. Under the condition of having no natural wind or having the side toward natural wind, the influence districts of exhausted gas are confirmed by the multiple species transport models with the fixed exhaust velocity of ejector system, and according to the influence area of exhausted gas, the pipe length and arrangement style are discussed.