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Study on the valveless and purgeless scheme to produce high frequency detonations in a long duration

Author

Listed:
  • Wang, Ke
  • Wang, Zhicheng
  • Zhao, Minghao
  • Sun, Tianyu
  • Tan, Fengguang
  • Zhu, Yiyuan
  • Lu, Wei
  • Yu, Xiaodong
  • Sha, Yu
  • Fan, Wei

Abstract

High frequency and long duration operations are the ultimate objective for the considerable efforts in developing practical pulse detonation engines (PDEs). Previous works have demonstrated that the valveless and purgeless scheme has a great advantage in reducing the hardware complexity to achieve high frequency detonations. However, the great challenge arises in the implementation of long duration operation. Therefore, the present work aims at clarifying the key factor that significantly impacts the long duration of detonations. In this study, the detonation tube wall thickness, the type of obstacles for promoting the deflagration to detonation transition (DDT) process, and the closed end structure have been parametrically checked regarding their influence on the duration of detonations. The results from experiments showed that, although the wall thickness has little impact on the operating time, a conical diffuser properly designed is found to be able to greatly increase the operating frequency and improve the supply pressure ceiling, as a result of the creation of an efficient buffer zone. Actually, long duration detonations of 49 s at 90 Hz were achieved when the conical diffuser with a semi-angle of 5° was utilized. Finally, it is proposed that comprehensive cooling should be considered in long duration detonations.

Suggested Citation

  • Wang, Ke & Wang, Zhicheng & Zhao, Minghao & Sun, Tianyu & Tan, Fengguang & Zhu, Yiyuan & Lu, Wei & Yu, Xiaodong & Sha, Yu & Fan, Wei, 2019. "Study on the valveless and purgeless scheme to produce high frequency detonations in a long duration," Energy, Elsevier, vol. 189(C).
    • Handle: RePEc:eee:energy:v:189:y:2019:i:c:s0360544219320390
    DOI: 10.1016/j.energy.2019.116344
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    References listed on IDEAS

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    1. Wang, Ke & Fan, Wei & Lu, Wei & Chen, Fan & Zhang, Qibin & Yan, Chuanjun, 2014. "Study on a liquid-fueled and valveless pulse detonation rocket engine without the purge process," Energy, Elsevier, vol. 71(C), pages 605-614.
    2. Tian, Ke & Wang, Jin & Liu, Chao & Yang, Li & Sundén, Bengt, 2018. "Effect of blockage configuration on film cooling with and without mist injection," Energy, Elsevier, vol. 153(C), pages 661-670.
    3. Xie, Qiaofeng & Wen, Haocheng & Li, Weihong & Ji, Zifei & Wang, Bing & Wolanski, Piotr, 2018. "Analysis of operating diagram for H2/Air rotating detonation combustors under lean fuel condition," Energy, Elsevier, vol. 151(C), pages 408-419.
    4. Wang, Ke & Fan, Wei & Lu, Wei & Zhang, Qibin & Chen, Fan & Yan, Chuanjun & Xia, Qiang, 2015. "Propulsive performance of a pulse detonation rocket engine without the purge process," Energy, Elsevier, vol. 79(C), pages 228-234.
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    1. Tan, Fengguang & Fan, Wei & Wang, Ke & Jin, Shufeng & Chen, Shuping, 2023. "Initiation of an upstream propagating detonation wave near the open end of the detonation tube operating in the valveless and purgeless scheme," Energy, Elsevier, vol. 264(C).

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