Deflagration phenomena in a constant volume vessel under elevated gravity

Hiroyasu Saitoh, Kentaro Makita, Takaaki Mizutani, Tomohito Hori

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In order to clarify the effects of gravity on deflagration phenomena, we conducted flammable gas explosion experiments using a constant volume combustion vessel under several gravity level from earth gravity (1 G) to elevated gravity up to 50 G. The elevated gravity field was formed by a centrifuge. We observed the expanding flames in hydrogen-air, methane-air, and propane-air mixtures by a high-speed camera and measured explosion pressures in the vessel. Lean and rich flammablility limits were determined by the records of the explosion pressures, and it was confirmed that the flammable range were approximately same regardless of the gravity level. In the methane-air and propane-air conditions, the shapes of the propagating flames changed dramatically with increase of gravity due to strong buoyancy effect, especially in lean and rich flame conditions with slow burning velocity. Also, with increase of gravity, maximum overpressure and maximum rate of pressuer rise decreased except the case of hydrogen-air flame with higher burning velocity.

Original languageEnglish
Title of host publication47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2011
Publication statusPublished - 2011 Dec 1
Event47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2011 - San Diego, CA, United States
Duration: 2011 Jul 312011 Aug 3

Publication series

Name47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2011

Conference

Conference47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2011
CountryUnited States
CitySan Diego, CA
Period11/7/3111/8/3

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Aerospace Engineering
  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering

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  • Cite this

    Saitoh, H., Makita, K., Mizutani, T., & Hori, T. (2011). Deflagration phenomena in a constant volume vessel under elevated gravity. In 47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2011 (47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2011).