二元弯曲混合管出口结构参数对红外抑制器气动和辐射特性的影响

陈庚; 谭晓茗; 单勇; 张靖周

二元弯曲混合管出口结构参数对红外抑制器气动和辐射特性的影响

1.
南京航空航天大学能源与动力学院江苏省航空动力系统重点实验室,江苏南京 210016

基金项目:

南京航空航天大学研究生创新基地(实验室)开放基金(kfjj201408);中央高校基本科研业务费专项资金

详细信息

作者简介:
陈庚(1992-),男,硕士生,主要从事传热与红外抑制技术方面的研究。Email:chengeng@nuaa.edu.cn

中图分类号: V231.3

Impacts of two-dimensional curved mixing duct exit geometric parameters on flow dynamics and infrared radiation characteristics for IR suppressor

1.
Jiangsu Province Key Laboratory of Aerospace Power Systems,College of Energy and Power,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

摘要: 采用CFD和IR综合计算分析的方法,研究了不同结构参数的二元弯曲混合管对红外抑制器性能的影响。计算结果表明:与矩形出口的二元弯曲混合管相比,波瓣型面的混合管出口增加了排气出口周长,依靠粘性和剪切力的作用实现剪切混合,二次引射能力增强,抑制器整体引射性能最大提高了19.2%。同时,混合管壁面温度也显著降低,抑制器垂直方向上3~5 m波段的红外辐射强度峰值最高降低了13.3%;在波瓣瓣高一定时,波瓣数增加,红外抑制器整体引射系数先增大后减小,而总压恢复系数先减小后增大;在波瓣瓣宽一定时,瓣高增加,红外抑制器引射系数逐渐增大,而总压恢复系数逐渐减小,辐射强度峰值最大降低了11.6%。
- 红外抑制器 /
- 两级引射 /
- 二元弯曲混合管 /
- 波瓣混合器 /
- 引射系数 /
- 总压恢复系数 /
- 红外辐射强度
Abstract: Based on general CFD/IR numerical simulations, the effects of two-dimensional curved mixing duct geometric parameters on helicopter aerodynamics and infrared radiation characteristics were investigated. Conclusions can be drawn as follows according to the computational results: Compared with two-dimensional curved mixing duct with rectangular outlet, the distorted configurations of mixing duct lobed rectangular outlet extend the perimeter of exhaust exit, thus the strength of the secondary flow shed by lobes is enhanced due to the effective shear-mixing caused by viscous and shear force, which contributes to a maximum increase about 19.2% in pumping capacity of the overall IR suppressor. Simultaneously, wall temperature of mixing duct is reduced significantly and the maximum infrared radiation intensity is decreased about 13.3% to its highest when changing the shape of mixing duct outlet from rectangle to rectangular lobe. When the lobe heights of mixing ducts remain unchanged, with the increase of lobe numbers, the pumping ratio of IR suppressor firstly increases then decreases, while the total pressure recovery coefficient firstly decreases then increases. In addition, when the lobe numbers of remain unchanged, with the increase of lobe heights, the pumping ratio rises gradually, but the total pressure recovery coefficient keeps declining, and in this situation, the infrared radiation intensity peak achieve a maximum decrease about 11.6%.
- IR suppressor /
- two-stage ejection /
- two-dimensional curved mixing duct /
- lobed mixer /
- pumping ratio /
- total pressure recovery coefficient /
- infrared radiation intensity

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二元弯曲混合管出口结构参数对红外抑制器气动和辐射特性的影响

作者简介:
陈庚(1992-),男,硕士生,主要从事传热与红外抑制技术方面的研究。Email:chengeng@nuaa.edu.cn

Impacts of two-dimensional curved mixing duct exit geometric parameters on flow dynamics and infrared radiation characteristics for IR suppressor

计量

二元弯曲混合管出口结构参数对红外抑制器气动和辐射特性的影响

1. 南京航空航天大学能源与动力学院江苏省航空动力系统重点实验室,江苏南京 210016

作者简介:
陈庚(1992-),男,硕士生,主要从事传热与红外抑制技术方面的研究。Email:chengeng@nuaa.edu.cn

English Abstract

Impacts of two-dimensional curved mixing duct exit geometric parameters on flow dynamics and infrared radiation characteristics for IR suppressor

1. Jiangsu Province Key Laboratory of Aerospace Power Systems,College of Energy and Power,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

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二元弯曲混合管出口结构参数对红外抑制器气动和辐射特性的影响

作者简介: 陈庚(1992-),男,硕士生,主要从事传热与红外抑制技术方面的研究。Email:chengeng@nuaa.edu.cn

Impacts of two-dimensional curved mixing duct exit geometric parameters on flow dynamics and infrared radiation characteristics for IR suppressor

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二元弯曲混合管出口结构参数对红外抑制器气动和辐射特性的影响

1. 南京航空航天大学 能源与动力学院 江苏省航空动力系统重点实验室,江苏 南京 210016

作者简介: 陈庚(1992-),男,硕士生,主要从事传热与红外抑制技术方面的研究。Email:chengeng@nuaa.edu.cn

English Abstract

Impacts of two-dimensional curved mixing duct exit geometric parameters on flow dynamics and infrared radiation characteristics for IR suppressor

1. Jiangsu Province Key Laboratory of Aerospace Power Systems,College of Energy and Power,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

全文HTML

目录

作者简介:
陈庚(1992-),男,硕士生,主要从事传热与红外抑制技术方面的研究。Email:chengeng@nuaa.edu.cn

1. 南京航空航天大学能源与动力学院江苏省航空动力系统重点实验室,江苏南京 210016

作者简介:
陈庚(1992-),男,硕士生,主要从事传热与红外抑制技术方面的研究。Email:chengeng@nuaa.edu.cn