Experiment on combustion characteristics of U⁃bend pulse detonation combustor under high temperature inlet stream

Wenhao TAN; Longxi ZHENG; Jie LU; Lingyi WANG; Kang HUANG

doi:10.13224/j.cnki.jasp.20210159

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Experiment on combustion characteristics of U⁃bend pulse detonation combustor under high temperature inlet stream

Combustion,Heat and Mass Transfer | 更新时间：2025-04-07

- Experiment on combustion characteristics of U⁃bend pulse detonation combustor under high temperature inlet stream
- Journal of Aerospace Power Vol. 37, Issue 3, Pages: 502-510(2022)
- 作者机构：
  
  1.西北工业大学动力与能源学院，西安 710129
  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
- 作者简介：
- 基金信息：
- DOI：10.13224/j.cnki.jasp.20210159
  CLC：
- 稿件说明：
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Wenhao TAN, Longxi ZHENG, Jie LU, et al. Experiment on combustion characteristics of U⁃bend pulse detonation combustor under high temperature inlet stream[J]. Journal of Aerospace Power, 2022, 37(3): 502-510.
DOI：

Wenhao TAN, Longxi ZHENG, Jie LU, et al. Experiment on combustion characteristics of U⁃bend pulse detonation combustor under high temperature inlet stream[J]. Journal of Aerospace Power, 2022, 37(3): 502-510. DOI： 10.13224/j.cnki.jasp.20210159.

摘要

为了获得高温来流下气/液两相多循环U型脉冲爆震燃烧室（U⁃PDC）的燃烧特性，使用汽油/空气为燃料和氧化剂开展了相关试验研究。结果表明：当来流温度为373 K，U⁃PDC能够在15~38 Hz范围内稳定工作，且随着工作频率提高爆燃向爆震转变（DDT）距离缩短；在室温条件下、工作频率为15~25 Hz时，未能形成充分发展爆震波，表明高温来流可促进DDT过程。在室温条件下、工作频率为15~25 Hz时，由于U型爆震弯段内可燃混气分布不均匀，U型爆震弯段外侧监测到火焰的时间晚于U型弯段出口，当来流温度升至373 K后该现象明显改善。此外，U⁃PDC的点火起爆时间在3~10 ms内，且点火延迟时间是影响点火起爆时间的主要因素；U⁃PDC工作频率相同、来流温度从室温升高至373 K或来流温度相同、U⁃PDC工作频率提高时，波速随之提高，点火起爆时间缩短。

Abstract

In order to obtain the combustion characteristics of gas⁃liquid two⁃phase multi⁃cycle U⁃bend pulse detonation combustor （U⁃PDC） under high temperature inlet stream，experimental research was carried out by using gasoline and air as fuel and oxidant.The results indicated that the U⁃PDC can achieve stable operation at the working frequency of 15-38 Hz when the inlet temperature was 373 K，and the deflagration to detonation transition （DDT） distance was shortened when the working frequency increased.When the working frequency was 15-25 Hz，the detonation initiation failed at room temperature.The results showed that high temperature inflow can promote the DDT process.At room temperature and working frequency of 15-25 Hz，due to the uneven distribution of combustible gas in the U⁃bend detonation tube，the time when the flame was detected outside of the U⁃bend detonation tube was later than the exit of the U⁃bend detonation tube.When the inflow temperature increased to 373 K，the phenomenon was obviously improved.In addition，the ignition time of U‑PDC was within 3-10 ms，which was greatly affected by ignition delay time.When the working frequency of U⁃PDC was the same and the inlet stream temperature raised from room temperature to 373 K，the wave velocity increased，and the ignition time decreased.

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