TY - JOUR
T1 - Effect of slot gas injection to the flow field and coherent structure characteristics of a backstep flow
AU - Harinaldi,
AU - Ueda, Toshihisa
AU - Mizomoto, Masahiko
N1 - Funding Information:
This work was supported by a grant from the Japanese Ministry of Education. The authors would like to thank M. Sakai and Y. Shimozono for helping the experimentation and the Hitachi Scholarships Fnd. for financial support to the first author to do the research in Japan.
PY - 2001/6/5
Y1 - 2001/6/5
N2 - The flow field and coherent structure of the flow over a backstep with slot-gas-injection were investigated. The mean flow, turbulence properties and coherent structure characteristics are significantly influenced by the increase of injection momentum near the step (/r/H=2). The mean flow field is characterized by recirculation zone splitting, with mass transfer of injected gas toward each part depending on the specific momentum ratio of injection. More mass entrainment, turbulence structures alteration in the shear layer and the hydrodynamic disturbances from the injection flow suppress the coherent structure velocity, size and detachment. These results provide basis information for achieving the balance of competing factors between geometrical and fluid dynamical parameters of injection to establish an efficient design of a combustor from the perspective of enhancing the gas-air mixing process.
AB - The flow field and coherent structure of the flow over a backstep with slot-gas-injection were investigated. The mean flow, turbulence properties and coherent structure characteristics are significantly influenced by the increase of injection momentum near the step (/r/H=2). The mean flow field is characterized by recirculation zone splitting, with mass transfer of injected gas toward each part depending on the specific momentum ratio of injection. More mass entrainment, turbulence structures alteration in the shear layer and the hydrodynamic disturbances from the injection flow suppress the coherent structure velocity, size and detachment. These results provide basis information for achieving the balance of competing factors between geometrical and fluid dynamical parameters of injection to establish an efficient design of a combustor from the perspective of enhancing the gas-air mixing process.
UR - http://www.scopus.com/inward/record.url?scp=0035811112&partnerID=8YFLogxK
U2 - 10.1016/S0017-9310(00)00301-X
DO - 10.1016/S0017-9310(00)00301-X
M3 - Article
AN - SCOPUS:0035811112
SN - 0017-9310
VL - 44
SP - 2711
EP - 2726
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
IS - 14
ER -