Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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URANS Computations for Flow Mixing of Heated Dual Jets

URANS를 이용한 가열된 이중제트의 유동혼합 특성에 대한 수치해석

  • Park, Tae Seon (School of Mechanical Engineering, Kyungpook National University)
  • Received : 2019.01.10
  • Accepted : 2019.03.12
  • Published : 2019.06.01
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Abstract

The flow mixing characteristics for the heated dual jets were numerically studied by using URANS (unsteady Reynolds-averaged Navier-Stokes). The increased turbulent diffusion was obtained for the compressible flow, and the thermal diffusion of incompressible flow increased more than that of compressible flow. From the results of FFT and phase portraits, periodic and quasi-periodic states were observed as the jet spacing increased. It was observed that linear variations of merging points and combined points were different because unsteady flow determined the flow mixing characteristics for a large jet spacing.

비정상 난류모델 (URANS)를 이용하여 가열된 이중제트의 유동혼합 특성에 대한 수치해석이 수행되었다. 압축성유동에서 난류확산이 크게 나타났고 비압축성 유동의 열확산이 압축성유동의 열확산 보다 크게 얻어졌다. 주파수와 위상궤적을 분석한 결과, 제트간격이 증가함에 따라 주기상태와 준주기상태가 관찰되었다. 제트간격이 클 경우 비정상유동구조가 제트유동 혼합의 특징을 결정하기 때문에 융합점과 결합점의 선형적 변화가 다르게 나타나는 것으로 관찰되었다.

Keywords

References

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