Wave instabilities in combustion and thrust chambers

W. S. Yoon, T. J. Chung

Research output: Contribution to conferencePaperpeer-review


A new theory and computations for combustion instability analysis are presented herein. The basic theoretical foundation sterna from the concept of entropy-controlled energy growth or decay. Third order perturbation expansion is performed on the entropy-controlled acoustic energy equation to obtain the stability integrodifferential equation for the energy growth factor in terms of the linear, second, and third order energy growth rate parameters. These parameters are calculated from Navier-Stokes solutions with space and time averages performed on as many Navier-Stokes time steps as required to Navier at least one peak wave period. Applications, e made for one-dimensional Navier-Stokes solution the space shuttle main engine thrust chamber the cross section area variations taken into account. It is shown that instability occurs when the mean pressure is raised to 2000 psi with 30% disturbances for the case investigated in this analysis. Instability also arises when the mean pressure is set at 3000 psi with 20% disturbances. The system with mean pressures and disturbances more adverse than these cases has been shown to be unstable.

Original languageEnglish
Publication statusPublished - 1990
EventAIAA 21st Fluid Dynamics, Plasma Dynamics and Lasers Conference, 1990 - Seattle, United States
Duration: 1990 Jun 181990 Jun 20


OtherAIAA 21st Fluid Dynamics, Plasma Dynamics and Lasers Conference, 1990
Country/TerritoryUnited States

Bibliographical note

Publisher Copyright:
© 1990 American Institute of Aeronautics and Astronautics, Inc.

All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Aerospace Engineering
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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