单列尖劈隔离段流动抵抗背压变化特性数值分析

贺登俊; 王兵

doi:10.13224/j.cnki.jasp.20230617

单列尖劈隔离段流动抵抗背压变化特性数值分析

doi: 10.13224/j.cnki.jasp.20230617

贺登俊^1,,
王兵^{2, 3,*, ,}

1.
北华航天工业学院河北省跨气水介质飞行器重点实验室，河北廊坊 065000
2.
清华大学航天航空学院，北京 100084
3.
河北省微纳卫星协同创新中心，河北廊坊 065000

详细信息

作者简介:
贺登俊（1999-），男，硕士生，主要从事超燃冲压发动机隔离段的研究。E-mail：hdj029@stumail.nciae.edu.cn

通讯作者:
王兵（1977-），男，教授、博士生导师，博士，主要从事两相流体动力学与湍流燃烧研究。E-mail：wbing@tsinghua.edu.cn

中图分类号: V231.3
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出版历程
- 收稿日期: 2023-09-26
- 网络出版日期: 2025-03-02

Numerical characterization of flow resistance to back pressure variations in a single-row ramp isolation section

HE Dengjun^1
,,
WANG Bing^{2, 3,*
, ,}

1.
Hebei Key Laboratory of Trans-Media Aerial Underwater Vehicle，North China Institute of Aerospace Engineering，Langfang Hebei 065000，China
2.
School of Aerospace Engineering，Tsinghua University，Beijing 100084，China
3.
Hebei Collaborative Innovation Center of Micro Nano Satellites，Langfang Hebei 065000，China

摘要

摘要:
为提高超燃冲压发动机隔离段的抗背压波动能力，针对一种带有尖劈的隔离段结构，基于FLUENT软件进行数值仿真，获得了不同几何结构的隔离段内部流动特性，在此基础上分析了隔离段内激波串形成机制与隔离段抗反压机理。研究结果表明：在隔离段内设置尖劈可提高隔离段的抗背压能力，与没有尖劈时相比隔离段抗背压能力提升超过8%；数值仿真结果表明尖劈位置靠近上游时隔离段抗背压效果更好；相同背压条件下适当增加尖劈长度可把隔离段内激波串推向下游，相较于不含尖劈隔而言激波串前缘位置向下游方向移动约18.4 mm。
- 超燃冲压发动机 /
- 进气道 /
- 激波串 /
- 尖劈 /
- 激波串震荡
Abstract:
To enhance the anti-backpressure oscillation capability of the scramjet isolator, an isolator configuration featuring a ramp structure was studied. Numerical simulations were conducted by using FLUENT software to investigate the internal flow characteristics of the isolator with various geometric configurations. Subsequently, analysis was performed to elucidate the mechanism behind shockwave train formation within the isolator and the mechanism of backpressure resistance. The research findings indicated that the introduction of a ramp within the isolator significantly enhanced its resistance to backpressure. Compared with the isolator without a ramp, the backpressure resistance of the ramp-equipped isolator was improved by more than 8%. Numerical simulation results also demonstrated that placing the ramp closer to the upstream end of the isolator yielded better performance in terms of resisting backpressure. Under the same backpressure conditions, appropriately increasing the length of the ramp displaced the shockwave train downstream within the isolator. Compared with the isolator without a ramp, the front edge of the shockwave train was displaced downstream by approximately 18.4 mm.
- scramjet /
- inlet /
- shockwave train /
- ramp /
- shockwave train oscillation

HTML

图 1 隔离段模型

Figure 1. Isolator model

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图 2 隔离段对称面内上壁面压力实验结果与数值计算结果对比

Figure 2. Comparison between experimental and numerical pressure results on upper wall surface in symmetric plane of isolator segment

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图 3 工况1和工况3的马赫数云图

Figure 3. Mach number contour plots for operating conditions 1 and 3

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图 4 壁面压力图

Figure 4. Wall pressure plot

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图 5 有尖劈不同背压情况下激波串在隔离段内的形态

Figure 5. Configuration of shockwave train inside isolator segment with ramp at different backpressures

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图 6 有尖劈的隔离段在不同背压的上下壁面压力曲线

Figure 6. Pressure curves on upper and lower walls of isolator segment with ramp at different backpressures

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图 7 入口带尖劈隔离段和标准隔离段最大背压上壁面静压曲线

Figure 7. Maximum backpressure upper wall static pressure curves for inlet with ramp isolator segment and standard isolator segment

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图 8 尖劈位置对激波串最大反压的影响

Figure 8. Effect of ramp placement position on the maximum backpressure of shockwave train

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图 9 尖劈高度对激波串前缘位置的影响

Figure 9. Effect of ramp height on leading edge position of shockwave train

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图 10 尖劈长度对激波串前缘位置的影响

Figure 10. Effect of ramp length on leading edge position of shockwave train

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图 11 尖劈对隔离段总压损失系数的影响

Figure 11. Effect of ramp on total pressure loss coefficient of isolation segment

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表 1 尖劈形状

Table 1. Ramp shape

工况 S/mm b/mm

1 0 0
2 35 1.8
3 35 2.7
4 35 3.6
5 39 2.7
6 43 2.7
7 47 2.7
8 51 2.7
9 55 2.7

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表 2 尖劈位置

Table 2. Ramp position

序号距入口长度

1 0
2 0.05L
3 0.1L
4 0.16L
5 0.33L
6 0.5L

下载: 导出CSV

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