不同当量比下喷管对旋转爆震特性的影响研究

王顺利; 吴云; 金迪; 郭善广; 钟也磐; 杨兴魁

doi:10.11883/bzycj-2019-0481

不同当量比下喷管对旋转爆震特性的影响研究

doi: 10.11883/bzycj-2019-0481

王顺利^1,,
吴云^{1, 2, ,},
金迪¹,
郭善广¹,
钟也磐¹,
杨兴魁¹

1.
空军工程大学航空等离子体动力学重点实验室，陕西西安 710038
2.
西安交通大学机械工程学院航空发动机研究所，陕西西安 710049

基金项目: 国家自然科学基金（91641204，51907205，51790511）；陕西省自然科学基础研究计划（2018JQ1011）

详细信息

作者简介:
王顺利（1993－　），男，硕士研究生，874370792@qq.com

通讯作者:
吴　云（1983－　），男，博士，教授，wuyun1223@126.com

中图分类号: O381；V231.22
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- 被引次数: 3
出版历程
- 收稿日期: 2019-12-27
- 修回日期: 2020-06-11
- 网络出版日期: 2020-08-25
- 刊出日期: 2020-10-05

Effects of nozzles on performance of rotating detonation at different equivalence ratios

1.
Key Laboratory of Airborne Plasma Dynamics, Air Force Engineering University, Xi’an 710038, Shaanxi, China
2.
Institute of Aero-Engine, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China

摘要

摘要: 为研究不同当量比下喷管构型对旋转爆震特性的影响，以煤油预燃裂解气为燃料，氧气体积分数为30%的富氧空气为氧化剂，开展了无喷管、收敛喷管、扩张喷管和收敛扩张喷管等工况下旋转爆震特性实验研究。实验发现，当量比为0.73～1.30时旋转爆震可稳定工作。随着当量比和喷管构型的变化，爆震波出现了单波、不稳定的对撞双波和稳定的对撞双波等3种传播模态。喷管构型对模态转换和旋转爆震波速有重要影响，收敛和收敛扩张喷管会促使新波头的产生，导致爆震波主要以双波对撞模态传播；而扩张喷管工况下，爆震波主要以单波模态传播。收敛喷管和收敛扩张喷管会使得波速最大值偏离化学恰当比，收敛扩张喷管可以提升爆震波速。
- 旋转爆震 /
- 煤油预燃裂解 /
- 喷管 /
- 模态转换 /
- 波速
Abstract: The impact of nozzle configuration on the performance of rotating detonation with different equivalence ratios was studied through tests on rotating detonating engines (RDEs) without a nozzle and with a convergent nozzle, a divergent nozzle and a convergent-divergent nozzle, respectively. Pre-combustion cracked kerosene and 30% oxygen-enriched air were used as the fuel and oxidizer, respectively. The results show that the rotating detonation engines can operate smoothly with the equivalence ratio ranging from 0.73 to 1.30. Three operating modes including single wave, unstable two counter-rotating waves and stable two counter-rotating waves were found in the experiments. The nozzle configurations strongly affect the mode transition and the detonation wave velocity. The convergent nozzle and the convergent-divergent nozzle can promote the generation of new detonation waves, making the working modes mainly to be two counter-rotating waves, while the detonation mainly operates in the single wave mode with a divergent nozzle installed. The results further show that the maximum propagating velocity deviates from the stoichiometric ratio when the convergent or convergent-divergent nozzles are installed, and the convergent-divergent nozzle can increase the detonation wave velocity.
- rotating detonation /
- kerosene pre-combustion cracking /
- nozzle /
- mode transition /
- wave velocity

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图 1 实验系统

Figure 1. Experimental system

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图 2 供油平台

Figure 2. Fuel supply system

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图 3 供气平台

Figure 3. Gas supply system

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图 4 实验时序

Figure 4. Time sequence of the experiments

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图 5 旋转爆震发动机简图

Figure 5. Schematic diagram of the RDE

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图 6 集气腔剖面图

Figure 6. The profile of the plenum chamber

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图 7 喷管侧剖面图

Figure 7. Side profiles of the nozzles

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图 8 燃烧室

Figure 8. The detonation combustion chamber

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图 9 PCB1快速傅里叶变换结果及压力信号放大图（当量比为0.85）

Figure 9. FFT results of PCB1 pressure signals and close-ups of PCB1 distribution at the equivalence ratio of 0.85

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图 10 压力信号时域(当量比为0.73，收敛喷管)

Figure 10. Overview of the PCB distribution (equivalence ratio 0.73, convergent nozzle)

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图 11 PCB1时域信号放大图(当量比为0.73，收敛喷管)

Figure 11. Close-up of PCB1 distribution (equivalence ratio 0.73, convergent nozzle)

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图 12 PCB1压力信号傅里叶变换结果(当量比为0.73，收敛喷管)

Figure 12. FFT results of PCB1 (equivalence ratio 0.73, convergent nozzle)

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图 13 PCB1压力信号的短时傅里叶变换结果(当量比为0.73，收敛喷管)

Figure 13. STFT results of PCB1 (equivalence ratio 0.73, convergent nozzle)

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图 14 PCB1压力信号的短时傅里叶变换结果（当量比为0.73）

Figure 14. The STFT results of PCB1 (equivalence ratio 0.73)

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图 15 PCB1压力信号的傅里叶变换结果（当量比为1.02）

Figure 15. FFT results of PCB1 (equivalence ratio 1.02)

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图 16 PCB2信号的短时傅里叶变换结果（当量比为1.02，收敛扩张喷管）

Figure 16. STFT results of PCB2 (equivalence ratio 1.02, convergent-divergent nozzle)

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图 17 PCB1压力信号放大图（当量比为1.02，收敛扩张喷管）

Figure 17. Close-up of PCB distribution (equivalence ratio 1.02, convergent-divergent nozzle)

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图 18 PCB1压力信号放大图（当量比为0.85，无喷管）

Figure 18. Close-up of PCB distribution (equivalence ratio 0.85, no nozzle installed)

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图 19 爆震波波速随当量比的变化

Figure 19. Detonation wave velocity varied with equivalence ratio

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表 1 实验工况

Table 1. Experimental conditions

F₁/(g·s⁻¹) F₂/(g·s⁻¹) F₃/(g·s⁻¹) F₄/(g·s⁻¹) γ

40.0 3.5 7.6 95.0 0.73
40.0 3.5 8.8 95.0 0.85
40.0 3.5 10.5 95.0 1.02
40.0 3.5 13.5 95.0 1.30

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