分离流状态下单边膨胀喷管内激波反射特性

李耀华; 李建强; 何成军; 苗磊; 梁锦敏; 高荣钊

doi:10.13224/j.cnki.jasp.20210624

分离流状态下单边膨胀喷管内激波反射特性

doi: 10.13224/j.cnki.jasp.20210624

1.
中国空气动力研究与发展中心高速空气动力研究所，四川绵阳 621000
2.
中国空气动力研究与发展中心空天技术研究所，四川绵阳 621000

详细信息

作者简介:
李耀华（1983-），男，高级工程师，硕士，研究领域为飞行器排气系统设计、推力矢量试验技术。E-mail：bitlyh@sina.cn

通讯作者:
何成军（1989-），男，助理研究员，博士，研究领域为飞行器进排气系统设计。E-mail：hecheng.jun@163.com

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出版历程
- 收稿日期: 2021-11-02
- 网络出版日期: 2023-04-02

Shock reflection characteristics in single expansion ramp nozzle under flow separation condition

1.
High Speed Aerodynamics Institute， China Aerodynamics Research and Development Center，Mianyang Sichuan 621000，China
2.
Aerospace Technology Institute， China Aerodynamics Research and Development Center，Mianyang Sichuan 621000，China

摘要

摘要:
在单边膨胀喷管（SERN）内流动分离状态下，综合采用试验和数值模拟手段对喷管内激波反射特性进行研究，分析了单边膨胀喷管内激波反射结构，对比了不同激波反射模式下的流动分离特性。结果表明：喷管落压比（NPR）由3.06向5.07变化的过程中，喷管内激波反射由马赫反射（MR）向规则反射（RR）转换，喷管上、下壁面非对称导致MR具有明显非对称特征；通过激波极曲线理论分析非对称MR形成机制，马赫杆上游垂直流向方向的压力梯度是非对称MR形成的根源；振荡NPR条件下，在一个完整周期内，激波反射未出现明显迟滞现象，但激波运动位置变化存在明显的迟滞效应，NPR上升下降过程中激波位置的差量随振荡频率增大而增大，较低（或较高）频振荡NPR条件下激波位置振荡幅值较大（或较小）。
- 单边膨胀喷管（SERN） /
- 激波反射 /
- 马赫反射（MR） /
- 规则反射（RR） /
- 喷管落压比（NPR） /
- 激波位置 /
- 迟滞现象
Abstract:
Combined with the focus schlieren and dynamic pressure measurement technology, the shock reflection inside a single expansion ramp nozzle (SERN) was investigated under the condition of flow separation. The flow characteristics of shock reflection were analyzed, and the flow separation characteristics were compared for different wave configurations of shock reflection. Results showed that the shock reflection configuration transitioned from Mach reflection (MR) to regular reflection (RR), during the change of nozzle pressure ratio (NPR) from 3.06 to 5.07. The MR structure inside SERN was obviously asymmetrical duo to the asymmetric upper and lower walls. Based on shock polar representation, the mechanism of asymmetric MR was analyzed. The pressure gradient in the vertical flow direction upstream the Mach stem was the source of asymmetric MR. A hysteresis did not exist in the transition process between RR and MR, during increasing and decreasing processes of NPR, but the shock position experienced a hysteresis effect. The percentage deviation of shock position increased with the increasing oscillation frequency, during increasing and decreasing processes of NPR. The lower oscillation frequency of NPR indicated the larger oscillation amplitude of shock position.
- single expansion ramp nozzle (SERN) /
- shock reflection /
- Mach reflection (MR) /
- regular reflection (RR) /
- nozzle pressure ratio (NPR) /
- shock position /
- hysteresis phenomenon

HTML

图 1 喷管模型^[17]

Figure 1. Schematic diagram of nozzle model^[17]

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图 2 喷管模型安装图^[17]

Figure 2. Nozzle model installation diagram^[17]

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图 3 试验和数值纹影图

Figure 3. Experimental and numerical schlieren images

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图 4 喷管壁面中心线时均压力分布

Figure 4. Centerline time-mean pressure distribution on nozzle wall

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图 5 对称马赫反射和规则反射示意图

Figure 5. Schematic diagram of symmetric Mach reflection and regular reflection

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图 6 非对称马赫反射和规则反射示意图

Figure 6. Schematic diagram of asymmetric Mach reflection and regular reflection

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图 7 马赫反射和规则反射极曲线

Figure 7. Polar curve of Mach reflection and regular reflection

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图 8 NPR随时间变化

Figure 8. Variation of NPR with time

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图 9 激波变化过程

Figure 9. Variation process of shock wave

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图 10 马赫盘或“X”激波位置随NPR变化

Figure 10. Variation of Mach stem or “X” shock wave position with of NPR oscillation

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表 1 马赫盘或者“X”激波位置振荡幅值

Table 1. Oscillation amplitude of Mach stem or “X” shock wave

参数工况a 工况b 工况c 工况d

f/Hz 25 50 75 100
A_m 1.22 1.19 1.17 1.15

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