Numerical prediction of the structure of high temperature axisymmetric turbulent jets
REVUE GENERALE DE THERMIQUE, cilt.35, sa.412, ss.232-242, 1996 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 35 Sayı: 412
- Basım Tarihi: 1996
- Doi Numarası: 10.1016/s0035-3159(96)80012-2
- Dergi Adı: REVUE GENERALE DE THERMIQUE
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.232-242
- Orta Doğu Teknik Üniversitesi Adresli: Hayır
Özet
Turbulent axisymmetric jets at high temperature are studied numerically by using first and second order turbulence models. Regarding the temperature fields, on which we concentrate in this work, predictions with both types of models do not show large differences. In general, predictions agree well with the measurements; the existing differences are usually favorable for the second order model. The effect of solving a transport equation for the scalar dissipation rate on the prediction of the mechanical to scalar time scale ratio and on the prediction of the scalar fluctuations is studied. The influence of varying the density ratio on parameters such as the axial decay rates of the temperature and velocity and the turbulence intensity are studied. Two definitions of the mixing efficiency are introduced. According to both definitions, the mixing efficiency decreases with increasing effects of buoyancy.