Experimental study of internal flow structures in cylindrical rotating detonation engines

Ryuya Yokoo, Keisuke Goto, Jiro Kasahara, Venkat Athmanathan, James Braun, Guillermo Paniagua, Terrence Meyer, Akira Kawasaki, Ken Matsuoka, Akiko Matsuo, Ikkoh Funaki

Research output: Contribution to journalArticle

Abstract

The internal flow structures of detonation wave were experimentally analyzed in an optically accessible hollow rotating detonation combustor with multiple chamber lengths. The cylindrical RDC has a glass chamber wall, 20 mm in diameter, which allowed us to capture the combustion self-luminescence. A chamber 70 mm in length was first tested using C2 H4 -O2 and H2 -O2 as propellants. Images with a strong selfluminescence region near the bottom were obtained, confirming the small extent of the region where most of the heat release occurs as found in our previous research. Based on the visualization experiments, we tested RDCs with shorter chamber walls of 40 and 20 mm. The detonation wave was also observed in the shorter chambers, and its velocity was not affected by the difference in chamber length. Thrust performance was also maintained compared to the longer chamber, and the short cylindrical RDC had the same specific impulse tendency as the cylindrical (hollow) or annular 70-mm chamber RDC. Finally, we calculated the pressure distributions of various chamber lengths, and found they were also consistent with the measured pressure at the bottom and exit. We concluded that the short-chamber cylindrical RDC with equal length and diameter maintained thrust performance similar to the longer annular RDC, further expanding the potential of compact RDCs.

Original languageEnglish
JournalProceedings of the Combustion Institute
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • Cylindrical rotating detonation engine
  • Detonation
  • Flow structure
  • Hollow rotating detonation engine
  • Optically accessible combustor

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

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  • Cite this

    Yokoo, R., Goto, K., Kasahara, J., Athmanathan, V., Braun, J., Paniagua, G., Meyer, T., Kawasaki, A., Matsuoka, K., Matsuo, A., & Funaki, I. (Accepted/In press). Experimental study of internal flow structures in cylindrical rotating detonation engines. Proceedings of the Combustion Institute. https://doi.org/10.1016/j.proci.2020.08.001