波瓣混合器对双S形二元排气系统红外特性的影响

王丁; 吉洪湖; 卢浩浩

doi:doi:10.3788/irla201746.0204004

红外与激光工程, 2017, 46 (2): 0204004, 网络出版: 2017-03-31

波瓣混合器对双S形二元排气系统红外特性的影响

Influence of lobed mixer on infrared character of serpentine 2-D exhaust system

论文大纲

王丁吉洪湖卢浩浩

作者单位

南京航空航天大学能源与动力学院, 江苏南京 210016

波瓣混合器双S形二元喷管红外辐射波瓣数 lobed mixer serpentine 2-D nozzle infrared radiation lobe number

摘要

为了研究波瓣混合器对排气系统红外特性的影响, 设计了波瓣数分别为12、15、18的波瓣混合器双S形二元排气系统, 通过数值计算研究了波瓣数对排气系统红外抑制效果的影响, 并与相应的环形混合器双S形二元排气系统对比。研究结果表明, 随着波瓣数的增加, 排气系统的推力略微升高, 最大差值在0.1%以内; 波瓣数越少, 排气系统内、外涵气流的热混合度越高, 尾喷流的最高温度和红外辐射强度越低, 波瓣数由18减少到12时, 喷流辐射强度最大降低了18.1%; 相比环形混合器双S形二元排气系统, 在侧向和下方探测面上纯喷流辐射的90°方位角, 三种波瓣数的波瓣混合器双S形二元排气系统辐射强度分别降低了20.9%和26.9%以上。因此, 为了得到更好的红外抑制效果, 建议使用较少波瓣数的波瓣混合器。

Abstract

In order to study the influence of lobed mixer on infrared(IR) character of serpentine 2-D exhaust system(S2ES), three different lobed mixer S2ESs with lobe numbers of 12, 15 and 18 were designed. The influence of lobe number on IR suppression of S2ES was studied numerically, and the results were compared with a relevant annular mixer S2ES. The results show that, as the lobe number increases, thrust rises slightly with the maximum difference less than 0.1%; the reduction of lobe number changing from 18 to 12 enhances the mixture of core flow and bypass flow and reduces the plume temperature, making the plume radiation intensity attenuated by 18.1% at most; compared with annular mixer S2ES, the radiation intensity of lobed mixer S2ES reduces at least 20.9% and 26.9% in the direction vertical to the axis of nozzle exit on the side and lower detection planes respectively. In summary, it is appropriate to use mixer with fewer lobes in order to achieve better IR suppression.

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王丁, 吉洪湖, 卢浩浩. 波瓣混合器对双S形二元排气系统红外特性的影响[J]. 红外与激光工程, 2017, 46(2): 0204004. Wang Ding, Ji Honghu, Lu Haohao. Influence of lobed mixer on infrared character of serpentine 2-D exhaust system[J]. Infrared and Laser Engineering, 2017, 46(2): 0204004.

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