Comparison of a Structured-LES and an Unstructured-DES Code for Predicting Combustion Instabilities in a Longitudinal Mode Rocket

Abstract

Summary: Both LES and DES area capable of simulating self-excited combustion instability. Agreement between the simulations and experiments for the unstable case was good. The marginally stable case proved more difficult Cyclic Heat release was captured. LES had a delayed reignition, likely responsible for the higher amplitudes. Cyclic Heat release was captured along with reignition event. Some differences in predictions are due to differences in the grids. No apparent winner, both approaches have strengths and weaknesses.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2014
Accession Number
ADA623028

Entities

People

  • Douglas G. Talley
  • Matt Harvanzinski
  • Venke Sankaran

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Air Force
  • Air Force Research Laboratories
  • Amplitude
  • Boltzmann Equation
  • Combustion
  • Computational Fluid Dynamics
  • Department Of Defense
  • Equations
  • Frequency
  • High Pressure
  • Information Operations
  • Instability
  • Kinetic Energy
  • Military Research
  • Rocket Oxidizers
  • Turbulent Mixing

Readers

  • Computational Modeling and Simulation
  • Fluid Mechanics and Fluid Dynamics.
  • Rocket Propulsion.