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为了明确短舱中吊挂系统的堵塞效应对波瓣混合排气系统气动热力性能的影响,采用数值模拟的方法对包含吊挂的混合排气系统进行了定量研究。研究结果表明,受吊挂系统的影响,在波瓣混合排气系统混合段内,存在着一大尺度的回流区,其作用范围随吊挂长度的增加而增加。在性能参数方面,与未考虑吊挂系统时相比,考虑吊挂之后,虽然混合排气系统出口处热混合效率以及推力系数下降很小,最大降幅仅分别为0.017和0.01,但总压恢复系数却显著下降,最大降幅达到了0.03。此外,随着吊挂系统长度的变化,排气系统出口处的热混合效率、总压恢复系数以及推力系数变化幅度小于0.01,变化很小。
In order to clarify the effect of the clogging effect of the suspension system in the nacelle on the aerodynamic performance of the lobed mixed exhaust system, a numerical simulation method was used to quantitatively study the hybrid exhaust system with suspension. The results show that there is a large-scale recirculation zone in the mixing section of lobed mixed exhaust system under the influence of the suspension system, and its scope of action increases with the increase of the hanging length. In terms of performance parameters, after considering the suspension, although the heat mixing efficiency at the outlet of the hybrid exhaust system and the decrease of the thrust coefficient are small, the maximum decrease is only 0.017 and 0.01 respectively when the suspension is not considered, but the total pressure recovery Coefficient has dropped significantly, the maximum decline of 0.03. In addition, with the change of the length of the suspension system, the change of the thermal mixing efficiency, the total pressure recovery coefficient and the thrust coefficient at the exit of the exhaust system is less than 0.01, showing little change.