直升机红外抑制器结构参数对抑制器性能影响的数值和实验研究

陈苏麒; 单勇; 张靖周; 张序墉

doi:10.13224/j.cnki.jasp.20210606

直升机红外抑制器结构参数对抑制器性能影响的数值和实验研究

doi: 10.13224/j.cnki.jasp.20210606

南京航空航天大学能源与动力学院航空飞行器热管理与能量利用工业和信息化部重点实验室，南京 210016

基金项目: 国家科技重大专项（J2019-Ⅲ-0009-0053）

详细信息

作者简介:
陈苏麒（1997-），男，硕士生，研究领域为传热与红外隐身。E-mail：suqichen@nuaa.edu.cn

通讯作者:
单勇（1978-），男，教授、博士生导师，博士，研究领域为传热与红外隐身。E-mail：nuaasy@nuaa.edu.cn

中图分类号: V231.1
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- 被引次数: 0
出版历程
- 收稿日期: 2021-10-21
- 网络出版日期: 2022-12-22

Numerical and experimental research on the effect of structural parameters of helicopter infrared suppressor on its performance

Key Laboratory of Thermal Management and Energy Utilization of Aircraft，Ministry of Industry and Information Technology，College of Energy and Power Engineering，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China

摘要

摘要:
在模型实验验证的基础上，采用数值模拟的方法，研究了一种红外抑制器二元混合管结构参数对红外抑制器整体气动性能和温度场的影响。研究结果表明：在研究参数范围内，随着二元混合管出口宽度的增大，二元引射喷管引射系数先上升后下降，弓形挡板冷端平均温度增幅为24%；随着二元混合管扩张角增大，引射系数下降，弓形挡板冷端平均温度增幅为3%；适当延长混合管直段长度，引射系数先缓慢上升而后下降，弓形挡板冷端温度变化较小。能否有效利用主流动量、抑制主流的流动分离是提高引射系数的关键。弓形挡板冷端表面温度受弓形挡板内部引射气流、弓形挡板冷端下游滞止涡和二元混合管窄边出口的回流冷气三者共同影响。
- 红外抑制器 /
- 二元混合管 /
- 引射系数 /
- 弓形挡板 /
- 主流动量 /
- 流动分离
Abstract:
Based on model experiment verification, a numerical simulation method was used to study the effect of the structural parameters of an infrared suppressor’s two-dimensional mixing duct on the overall aerodynamic performance and temperature field of the infrared suppressor. Results showed that: within the scope of the parameters, with the increase of the outlet width of the two-dimensional mixing duct, the pumping coefficient of the two-dimensional ejector nozzle increased first and then decreased, and the average temperature of the bow-shaped baffle cold side increased by 24%. As the expansion angle of the two-dimensional mixing duct increased, the pumping coefficient decreased, and the average temperature of the bow-shaped baffle cold side increased by 3%. If properly extending the length of the straight section of the mixing duct, the pumping coefficient first slowly rose and then decreased, and the temperature change at the bow-shaped cold side was small. The key to improve the pumping coefficient is whether the main flow’s momentum can be effectively used and the flow separation of the main flow can be suppressed. In general, the surface temperature of the bow-shaped baffle cold side is affected by the internal eject flow of the bow-shaped baffle, the stagnation vortex downstream the bow-shaped baffle cold side, and the cold backflow at the narrow edge outlet of the two-dimensional mixing duct.
- infrared suppressor /
- two-dimensional mixing duct /
- pumping coefficient /
- bow-shaped baffle /
- mainstream momentum /
- flow separation

HTML

图 1 红外抑制器模型

Figure 1. Infrared suppressor model

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图 2 分流引射器工作原理

Figure 2. Working principle of the separate flow ejector

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图 3 分流引射器结构参数

Figure 3. Structural parameters of separate flow ejector

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图 4 外部流场示意图

Figure 4. Schematic diagram of the external flow field

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图 5 实验系统示意图

Figure 5. Schematic diagram of experimental system

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图 6 实验测量方法

Figure 6. Experimental measurement method

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图 7 实验系统实物图

Figure 7. Physical drawing of experimental system

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图 8 实验结果与数值模拟结果对比

Figure 8. Comparison between experimental results and simulation results

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图 9 实验模型尾向与侧向视角温度分布

Figure 9. Temperature distribution of experimental model in tail and lateral viewing angles

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图 10 混合管出口温度的实验与数值模拟结果对比

Figure 10. Comparison of experimental and numerical results of mixing tube outlet temperature

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图 11 不同混合管结构参数对分流引射器引射系数影响

Figure 11. Effect of the structural parameters of the mixing duct on the pumping coefficient of the separate flow ejector

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图 12 混合管扩张角和出口宽度对引射系数影响

Figure 12. Effects of expansion angle and outlet width of the mixing duct on pumping coefficient

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图 13 混合管直段长度对引射系数影响

Figure 13. Effects of straight length of the mixing duct on the pumping coefficient

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图 14 不同混合管结构参数的静压云图

Figure 14. Static pressure contours of different mixing duct structural parameters

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图 15 不同混合管结构参数下的主流动量状态

Figure 15. Main flow momentum state of different mixing duct structural parameters

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图 16 弓形挡板冷端温度云图

Figure 16. Temperature contours of bow-shaped baffle cold side

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图 17 截面示意图

Figure 17. Schematic diagram of section

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图 18 不同混合管出口宽度带温度着色的速度矢量图

Figure 18. Velocity vector diagram with temperature coloring at the outlet width of different mixing ducts

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表 1 混合管结构参数

Table 1. Geometry parameters of mixing duct

No.	L/mm	α/（°）	S/mm
M1	210	15	150
M2	230	15	150
M3	250	15	150
M4	270	15	150
M5	290	15	150
M6	210	20	150
M7	230	20	150
M8	250	20	150
M9	270	20	150
M10	290	20	150
M11	210	25	150
M12	230	25	150
M13	250	25	150
M14	270	25	150
M15	290	25	150
M16	210	30	150
M17	230	30	150
M18	250	30	150
M19	270	30	150
M20	290	30	150
M21	250	15	90
M22	250	15	120
M23	250	15	180
M24	250	15	210
M25	250	15	240

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表 2 不同网格数下二元引射喷管引射系数计算结果

Table 2. Computed results of two-dimensional ejector nozzle pumping coefficient with different grid numbers

网格数/10⁶	引射系数
1.86	0.26
5.87	0.25
8.20	0.24
10.34	0.24

下载: 导出CSV

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