Active Combustion Control in a Ramjet Using Large-eddy Simulations

Abstract A large-eddy simulation model has been developed to study combustion instability in a ramjet combustor. A thin-flame model for premixed combustion is employed in the numerical scheme, which explicitly uses the local turbulent flame speed in the governing equation. Combustion instability in the ramjet has been numerically simulated. Two types of instability arc observed: a small-amplitude, high-frequency instability and a large-amplitude, low-frequency instability. Both such instabilities have been experimentally observed, and various computed flow features are in good qualitative agreement with experimental observations. The information obtained from these simulations has been used to develop an active control strategy to suppress the instability. Control of both types of combustion instability was successfully achieved using the acoustic feedback technique, and the control could be used to turn the instability on and off. The control is effective over a range of time delays, and the pressure flu...

[1]  A. Yoshizawa.  Statistical theory for compressible turbulent shear flows, with the application to subgrid modeling , 1986 .

[2]  A. Kerstein,et al.  Field equation for interface propagation in an unsteady homogeneous flow field. , 1988, Physical review. A, General physics.

[3]  Wen-Huei Jou,et al.  Numerical simulations of oscillatory cold flows in an axisymmetric ramjet combustor , 1990 .

[4]  E. Zukoski,et al.  Combustion instability sustained by unsteady vortex combustion , 1985 .

[5]  Active control of a premixed flame , 1990 .

[6]  E. Gutmark,et al.  Large-scale coherent structures as drivers of combustion instability , 1987 .

[7]  Ann P. Dowling,et al.  PRACTICAL ACTIVE CONTROL-SYSTEM FOR COMBUSTION OSCILLATIONS , 1990 .

[8]  J. Boris,et al.  Effects of energy release on high-speed flows in an axisymmetric combustor , 1989 .

[9]  Victor Yakhot,et al.  Propagation Velocity of Premixed Turbulent Flames , 1988 .

[10]  Simulations of ramjet combustor flow fields. II - Origin of pressureoscillations , 1987 .

[11]  Ephraim Gutmark,et al.  Large-Scale Coherent Structures as Drivers of Combustion Instability , 1989 .

[12]  Ulrich Schumann,et al.  Coherent structure of the convective boundary layer derived from large-eddy simulations , 1989, Journal of Fluid Mechanics.

[13]  Ben T. Zinn,et al.  Fluid mechanically coupled combustion instabilities in ramjet combustors , 1987 .

[14]  Wen-Huei Jou,et al.  Modes of oscillation in a nonreacting ramjet combustor flow , 1990 .

[15]  A. Williams,et al.  Combustion Theory: Second Edition , 1985 .

[16]  Suresh Menon.  Active Control of Combustion Instability in a Ramjet Using Large-Eddy Simulations. , 1991 .

[17]  Wen-Huei Jou,et al.  Large-Eddy Simulations of Combustion Instability in an Axisymmetric Ramjet Combustor , 1991 .

[18]  T. A. Zang,et al.  The subgrid‐scale modeling of compressible turbulence , 1987 .

[19]  Ephraim Gutmark,et al.  Active combustion control in a coaxial dump combustor , 1990 .

[20]  D. C. Leslie,et al.  Large eddy simulation - A predictive approach to turbulent flow computation , 1979 .

[21]  K. Schadow,et al.  Active control of a dump combustor with fuel modulation , 1991 .

[22]  Ephraim Gutmark,et al.  On the Role of Large and Small-Scale Structures in Combustion Control , 1989 .

[23]  Ann P. Dowling,et al.  Active control of reheat buzz , 1987 .

[24]  S. Menon,et al.  Simulations of ramjet combustor flow fields. I - Numerical model, large-scale and mean motions , 1987 .

[25]  James D. Sterling,et al.  Longitudinal Mode Combustion Instabilities in a Dump Combustor , 1987 .