Computational analysis of the feasibility of a micro-pulsejet

Qun Wan, William Roberts, A. V. Kuznetsov*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

This paper investigates the feasibility of a 2-cm micro-pulsejet by numerically simulating the inviscid gas dynamic phenomena within the exhaust tube and comparing them with those for a pulsejet on the order of 50 cm in length. After initial combustion, the pressure wave propagates towards the exit and reflects back as a rarefaction wave, which generates a minimum pressure in the combustion chamber. This low pressure must be sufficient to open the reed valves to allow fresh reactants to enter. It is shown that for both large and micro-pulsejets, the minimum pressure is low enough. The characteristic operating frequency is found to be approximately inversely proportional to the pulsejet length. Estimation of the boundary layer thickness in the pulsejet shows that viscosity plays a very significant role in the micro-pulsejet and cannot be neglected.

Original languageEnglish (US)
Pages (from-to)19-26
Number of pages8
JournalInternational Communications in Heat and Mass Transfer
Volume32
Issue number1-2
DOIs
StatePublished - Jan 1 2005

Keywords

  • Micro-size engine
  • Numerical modeling
  • Pulse combustion
  • Pulsejet

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Chemical Engineering(all)
  • Condensed Matter Physics

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