DOI QR코드

DOI QR Code

RANS 및 LES를 이용한 리세스가 있는 동축분사기의 유동혼합에 대한 수치해석

RANS-LES Simulations of Scalar Mixing in Recessed Coaxial Injectors

  • 박태선 (경북대학교 기계공학부)
  • 투고 : 2011.07.18
  • 심사 : 2012.01.19
  • 발행 : 2012.02.01

초록

동축제트분사기에 대한 난류유동의 특징이 비선형 $k-{\varepsilon}-f_{\mu}$ 모형[1]과 큰에디모사법에 의해서 조사되었다. 비연소조건에서 밀도가 다른 유체가 혼합될 때 레이놀즈수가 일정한 조건에서 리세스와 운동량비가 변화되었다. 비선형 $k-{\varepsilon}-f_{\mu}$ 모형은 리세스와 운동량비의 다양한 조건에서 의미있는 상관관계를 제안하였다. LES결과는 리세스에 의해서 난류유동 구조의 변화를 잘 묘사해 주었다. 리세스가 있는 경우 난류운동에너지의 발달은 리세스가 없는 경우보다 빠르게 나타났다. 또한, 혼합특성은 전단변형률의 변화가 지배적이었지만 국부적인 혼합은 리세스에 의해서 변화되었다.

The turbulent flow characteristics in a coaxial injector were investigated by the nonlinear $k-{\varepsilon}-f_{\mu}$ model of Park et al.[1] and large eddy simulation (LES). In order to analyze the geometric effects on the scalar mixing for nonreacting variable-density flows, several recessed lengths and momentum flux ratios are selected at a constant Reynolds number. The nonlinear $k-{\varepsilon}-f_{\mu}$�� model proposed the meaningful characteristics for various momentum flux ratios and recess lengths. The LES results showed the changes of small-scale structures by the recess. When the inner jet was recessed, the development of turbulent kinetic energy became faster than that of non-recessed case. Also, the mixing characteristics were mainly influenced by the variation of shear rates, but the local mixing was changed by the adoption of recess.

키워드

참고문헌

  1. Park, T. S., Sung, H. J. and Suzuki, K., "Development of a nonlinear near-wall turbulence model for turbulent flow and heat transfer," Int. J. Heat and Fluid Flow, Vol. 24, 2003, pp.29-40 https://doi.org/10.1016/S0142-727X(02)00211-4
  2. Sasaki, M., Sakamoto, H., Takahashi, M., Tomita, T. and Tamura, H., "Comparative Study of Recessed and Non-Recessed Swirl Coaxial Injectors," AIAA 1997-2907, 1997
  3. Bazarov, V. G. and Yang, V., "Liquid-Propellant Rocket Engine Injector Dynamics," Journal of Propulsion and Power, Vol. 14, 1998, pp.797-806 https://doi.org/10.2514/2.5343
  4. Kendrick, D., Herding, G., Scouflaire, P., Rolon, C. and Candel, S., "Effects of a Recess on Cryogenic Flame Stabilization," Combution and Flame, Vol. 118, 1999, pp.327-339 https://doi.org/10.1016/S0010-2180(98)00168-0
  5. Bazarov, V. G., Yang, V. and Puneesh, P., "Design and Dynamics of Jet and Swirl Injectors," In Yang, V., Habiballah, M., Hulka, J. and Popp, M. (Eds.) Liquid Rocket Thrust Chambers: Aspect of Modeling, Analysis and Design, Progress in Astronautics and Aeronautics, 2004, Vol. 200, pp.19-104
  6. Kiwata, T., Okajima, A., Ueno, Hisanori and Kimura, S., "Vortex Frequencies of Coaxial Jets", International Conference on Fluid Engineering, Tokyo, Japan, 1997, pp.111-116
  7. Park, T. S. and Chung, Y. M., "Turbulent Flow and Scalar Mixing of a Coaxial Injector Having Two Fluid Jets," Numerical Heat Transfer Part A, Vol. 60, 2011, pp.197-211 https://doi.org/10.1080/10407782.2011.582410
  8. Lilly, D. K, "A Proposed Modication of the Germano Subgrid-Scale Closure Model," Physics of Fluids, Vol. 4, 1992, pp.633-635 https://doi.org/10.1063/1.858280
  9. Kee, R. J., Rupley, F. M. and Miller, J. A., "CHEMKIN-II: A Fortran Chemical Kinetics Package for the Analysis of Gas-Phase Chemical Kinetics," Technical Report SAND89-8009, Sandia National Lab, 1990
  10. Lele, S. K., "Compact Finite Difference Schemes with Spectral-Like Resolution," J. Coumputational Physics, Vol. 103, 2000, pp.16-42
  11. Issa, R. I., "Solution of the Implicitly Discretised Fluid Flow Equations by Operator-Splitting," Journal of Computational Physics, Vol. 62, 1986, pp.40-65 https://doi.org/10.1016/0021-9991(86)90099-9
  12. Park, T. S., "Effect of Time-Integration Method in a Large Eddy Simulation Using PISO Algorithm: Part I - Flow Field," Numerical Heat Transfer Part A, Vol. 50, 2006, pp.229-245 https://doi.org/10.1080/10407780600602374
  13. Park, T. S., "Effect of Time-Integration Method in a Large Eddy Simulation Using PISO Algorithm: Part II - Thermal Field," Numerical Heat Transfer Part A, Vol. 50, 2006, pp.247-262 https://doi.org/10.1080/10407780600602234
  14. Djeridane, T., Amielh, M., Anselmet, F. and Fulachier, L., "Velocity turbulence properties in the near-field region of axisymmetric variable density jets," Physics of Fluids, Vol. 8(6), 1996, pp.1614-1630 https://doi.org/10.1063/1.868935
  15. Foust, M. J., Desphande, M., Pal, S., Ni, T., Merkle, C. L. and Santoro, R. J., "Experimental and Analytical Characterization of a Shear Coaxial Combusting $GO_2/GH_2$ Flowfield jets," AIAA 34th Aerospace Science Meeting & Exhibit, AIAA 1996-0646, Reno, 1996
  16. Schumaker, S.A. and Driscoll, J.F., "Coaxial Turbulent Jet Flames: Scaling Relations for Measured Stoichiometric Mixing Lengths", Proceedings of the Combustion Institute, Vol. 32, 2009, pp.1655-1662 https://doi.org/10.1016/j.proci.2008.06.051
  17. Jeong, J. and Hussain, F., "On the Identification of a Vortex", J. Fluid Mech., Vol. 285, 1995, pp.69-94 https://doi.org/10.1017/S0022112095000462

피인용 문헌

  1. Numerical Analysis of Recess Effects on Gaseous Hydrogen/Liquid Oxygen Coaxial Injector vol.20, pp.3, 2016, https://doi.org/10.6108/KSPE.2016.20.3.017
  2. Effects of the Recess and Propellants Mass Flow on the Flammability Limit and Structure of Methane-Oxygen Diffusion Flame vol.22, pp.1, 2018, https://doi.org/10.6108/KSPE.2018.22.1.028