• Title/Summary/Keyword: Reacting Wakes

Search Result 3, Processing Time 0.02 seconds

Stability Analysis of Reacting Wakes (반응성 후류유동의 불안정성 해석)

  • Shin, D.S.;Hong, S.J.;Park, S.H.
    • Journal of the Korean Society of Combustion
    • /
    • v.2 no.1
    • /
    • pp.9-16
    • /
    • 1997
  • This paper investigates the linear stability of wakes with special emphasis on the difference of velocity and density. Velocity and density profiles for laminar flows have gaussian profiles. Incompressible wakes have two generalized inflection points and two unstable modes-sinuous and varicose modes. Sinuous modes are more unstable than varicose modes irrespective of density variation, which shows wakes will be destabilized by sinuous modes. Large velocity difference and density difference leads to more unstable wakes due to large momentum difference.

  • PDF

Stability Analysis of Wakes with Chemical Reaction (연소 반응을 가지는 후류 유동의 불안정성)

  • 신동신;홍성제
    • Journal of the Korean Society of Propulsion Engineers
    • /
    • v.2 no.2
    • /
    • pp.30-37
    • /
    • 1998
  • This paper investigates the linear stability of wakes with special emphasis on the effect of chemical reaction. Velocity and density profiles for laminar flows are obtained from analytic profiles as well as from simulation. Wakes have two generalized inflection points and two unstable modes-sinuous and varicose modes. For analytical laminar profiles, sinuous modes are more unstable than varicose modes irrespective of density variation, which shows wakes will be destabilized by sinuous modes. Large velocity difference and density difference lead to more unstable wakes due to large momentum difference. For simulated laminar profiles, chemical reaction with stoichiometric chemistry increases temperature and stabilizes the flow due to increase in compressible reacting wades, flow becomes stable as velocity increases due to viscous dissipation.

  • PDF

Stability Analysis of Reacting Mixing Layers with Density Gradient and Wake Deficit (밀도구배 및 후류손실을 가지는 혼합층의 불안정성에 관한 연구)

  • 신동신;황승환
    • Journal of the Korean Society of Propulsion Engineers
    • /
    • v.3 no.2
    • /
    • pp.10-17
    • /
    • 1999
  • This paper investigates the linear stability of both uniform and non-uniform density plane mixing layers with special emphasis on the effect of the wake component in the velocity profile. Velocity and density profiles for laminar flows are obtained from analytic profiles. Mixing layers with wakes have two generalized inflection points and two unstable modes-sinuous and varicose modes. For uniform density mixing layers, sinuous modes are more unstable than varicose modes, which shows wakes will be destabilized by sinuous modes. For non-uniform density mixing layers with high density in high speed flows, sinuous modes are more unstable than varicose modes. For non-uniform density mixing layers with high density in low speed flows, varicose modes can be more unstable than sinuous modes.

  • PDF