The three-dimensional mean and turbulence characteristics of an impingingdensity jet in a confined cross-flow were numerically investigated using the RNG turbulence model.The comparison of the subregion structures and...The three-dimensional mean and turbulence characteristics of an impingingdensity jet in a confined cross-flow were numerically investigated using the RNG turbulence model.The comparison of the subregion structures and gross features between the numerical results and theexperimental data show good agreement. The velocity, Turbulent Kinetic Energy (TKE) andconcentration distributions of the impinging jet in near field were obtained and analyzed. Theresults indicate that the flow and concentration fields of the impinging jet in the crossflowexhibit distinguished three-dimensionality in the near field. There exist upstream wail vortices anddownstream wall jet zones in the impinging region, and the TKE and concentration decays areasymmetrical in relation to the stagnation point. The lateral concentration distribution range inthe impinging region spreads considerably. The enhanced entrainment and mixing of the impinging jetin the confined crossflow are mostly associated with the impinging action and lateral expansion inthe impinging region. The presence of the bottom wall restrains the formation of the span-wiserollers in the transverse jet region and vertical entrainment and mixing in the impinging region andthe transition re-gioa展开更多
文摘The three-dimensional mean and turbulence characteristics of an impingingdensity jet in a confined cross-flow were numerically investigated using the RNG turbulence model.The comparison of the subregion structures and gross features between the numerical results and theexperimental data show good agreement. The velocity, Turbulent Kinetic Energy (TKE) andconcentration distributions of the impinging jet in near field were obtained and analyzed. Theresults indicate that the flow and concentration fields of the impinging jet in the crossflowexhibit distinguished three-dimensionality in the near field. There exist upstream wail vortices anddownstream wall jet zones in the impinging region, and the TKE and concentration decays areasymmetrical in relation to the stagnation point. The lateral concentration distribution range inthe impinging region spreads considerably. The enhanced entrainment and mixing of the impinging jetin the confined crossflow are mostly associated with the impinging action and lateral expansion inthe impinging region. The presence of the bottom wall restrains the formation of the span-wiserollers in the transverse jet region and vertical entrainment and mixing in the impinging region andthe transition re-gioa
