한국추진공학회지 (Journal of the Korean Society of Propulsion Engineers)

  • 제16권1호
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  • Pages.55-63
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  • 2012
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  • 1226-6027(pISSN)
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  • 2288-4548(eISSN)
한국추진공학회 (The Korean Society of Propulsion Engineers)
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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
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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

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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