A Numerical Study on Radiation-Induced Oscillatory Instability in CH/Air Diffusion Flames

- Journal title : Transactions of the Korean Society of Mechanical Engineers B
- Volume 25, Issue 1, 2001, pp.29-35
- Publisher : The Korean Society of Mechanical Engineers
- DOI : 10.22634/KSME-B.2001.25.1.29

Title & Authors

A Numerical Study on Radiation-Induced Oscillatory Instability in CH/Air Diffusion Flames

Son, Chae-Hun; Jeong, Seok-Ho;

Son, Chae-Hun; Jeong, Seok-Ho;

Abstract

Radiation-induced oscillatory instability in CH/Air diffusion flames is numerically investigated by adopting detailed chemistry. Counterflow diffusion flame is employed as a model flamelet and optically thin gas-phase radiation is assumed. Attention is focused on the extinction regime induced by radiative heat loss, which occurs at low strain rate. Once a steady flame structure is obtained for a prescribed value of initial strain rate, transient solution of the flame is calculated after a finite amount of strain-rate perturbation is imposed on the steady flame. Depending on the initial strain rate and the amount of perturbed strain rate, transient evolution of the flame exhibits various types of flame-evolution behaviors. Basically, the dynamic behaviors can be classified into two types, namely oscillatory decaying solution and diverging solution leading to extinction.

Keywords

CH/Air Diffusion Flames;Oscillatory Instability;Radiative Heat Loss;

Language

Korean

Cited by

References

1.

Strehlow, R. A., 1985, Combustion Fundamentals, McGraw-Hill, Inc.

2.

Chen, R., Mitchell, G. B., and Ronney, P. D., 1992, 'Diffusive-Thermal Instability and Flame Exinction in Nonpremixed Combustion,' Twenty-Fourth Symposium(International) on Combustion, The Combustion Institute, Pittsburgh, PA, pp. 213-221

3.

Kim, J. S., Williams, F. A., and Ronney, P. D., 1996, 'Diffusional-Thermal Instability of Diffusion Flames with Lewis Numbers Close to Unity,' Journal of Fluid Mechanics, Vol. 327, pp. 273-301

4.

Kim, J. S., 1997, 'Linear Analysis of Diffusional-Thermal Instability of Diffusion Flames with Lewis Numbers Close to Unity,' Combustion Theory and Modelling, Vol. 1, pp. 13-40

5.

Cheatham, S. and Matalon, M., 1996, 'Heat Loss and Lewis Number Effects on the Onset of Ossilations in Diffusion Flames,' Twenty-Sixth Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, PA, pp. 1063-1070

6.

Nayagam, V. and Williams, F. A., 1998, 'Dynamics of Diffusion Flames Oscillations Prior to Extinction during Low Gravity Droplet Combustion,' Seventh International Conference on Numerical Combustion, York, England, Mar. 30-Apr. 1, p. 46

7.

Sohn, C. H., Chung, S. H., and Kim, J. S., 1999, 'Instability-Induced Extinction of Diffusion Flames Established in the Stagnant Mixing Layer,' Combustion and Flame, Vol. 117, pp. 404-412

8.

손채훈, 김종수, 1999, '복사 열손실로 인한 확산 화염의 맥동 불안정에 관한 연구,' 대한기계학회논문집 B권, 제23권, 제9호, pp. 1185-1191

9.

Sohn, C. H., Chung, S. H., Lee, S. R., and Kim, J. S., 1998, 'Structure and Acoustic - Pressure Response of Hydrogen-Oxygen Diffusion Flames at High Pressure,' Combustion and Flame, Vol. 115, pp. 299-312

10.

Kee, R. J., Warnatz, J., and Miller, J. A., 1983, 'A Fortran Computer Code Package for the Evaluation of Gas-Phase Viscosities, Conductivities, and Diffusion Coefficients,' Sandia National Laboratories Report, SAND83-8209

11.

Ju, Y., Guo, H., Maruta, K., and Liu, F., 1997, 'On the extinction Limit and Flammability Limit of Non-adiabatic Stretched Methane-Air Premixed Flames,' Journal of Fluid Mechanics, Vol. 342, pp. 315-334

12.

Tien, C. L., 1968, Advances in Heat Transfer, Vol. 5, pp. 253-324

13.

Kee, R. J., Grcar, J. F., Smooke, M. D., and Miller, J. A., 1990, 'A Fortran Program for Modelling Steady Laminar One-Dimensional Premixed Flames,' Sandia National Laboratories Report, SAND85-8240

14.

Kee, R. J., Rupley, F. M., and Miller, J. A., 1989, 'CHEMKIN-II: A Fortran Chemical Kinetics Package for the Analysis of Gas-Phase Chemical Kinetics,' Sandia National Laboratories Report, SAND89-8009

15.

손채훈, 1998, '확산화염의 음향파 응답 특성과 맥동 불안정에 관한 연구,' 공학박사 학위논문, 서울대학교