TY - JOUR
T1 - Study of circular transverse jet - A new method for high-efficiency mixing and combustion in crossflow
AU - Li, Ziwan
AU - Yuan, Yixiang
AU - Yao, Jun
AU - Varsegov, V. L.
AU - Duan, P. H.
AU - Zhao, Lu
PY - 2021/4
Y1 - 2021/4
N2 - For traditional combustion chambers, when the working condition deviates from the design point, the combustion efficiency will be greatly reduced, and harmful products such as NOx, CO and UHC will increase greatly. This brings huge waste of fuel and air pollution. In order to improve the combustion efficiency at off-design conditions, in this paper a new method using a circular transverse jet as a means of fuel injection, fuel/air mixing and flame stabilization is explored, and an innovative configuration of transverse jet device is developed. Accordingly, the circular transverse jet is studied numerically and experimentally. It is found that the unique aerodynamic structure and high turbulence intensity of the circular transverse jet give an efficient mixing of the fuel and the mainstream along the fuel jet trajectory. Although the deviation of the total excess air coefficient is far from 1, a uniform mixture is formed in the recirculation zone downstream of the jet with an excess air coefficient approaching to 1. Experimental results show that the average excess air coefficient in the recirculation zone is about 1.29, and the combustion efficiency reaches more than 99% at the end of the recirculation zone when the overall excess air coefficient is 10.5, even under the low pressure and temperature conditions. These results demonstrate an effective improvement of the combustion efficiency at off-design conditions by the method proposed in this paper. In addition, the flow field structure under the interaction of circular transverse jet with mainstream, the distribution characteristics of gas components and temperature in the combustion zone are studied, which laid the foundation for the further study and the engineering application of this method.
AB - For traditional combustion chambers, when the working condition deviates from the design point, the combustion efficiency will be greatly reduced, and harmful products such as NOx, CO and UHC will increase greatly. This brings huge waste of fuel and air pollution. In order to improve the combustion efficiency at off-design conditions, in this paper a new method using a circular transverse jet as a means of fuel injection, fuel/air mixing and flame stabilization is explored, and an innovative configuration of transverse jet device is developed. Accordingly, the circular transverse jet is studied numerically and experimentally. It is found that the unique aerodynamic structure and high turbulence intensity of the circular transverse jet give an efficient mixing of the fuel and the mainstream along the fuel jet trajectory. Although the deviation of the total excess air coefficient is far from 1, a uniform mixture is formed in the recirculation zone downstream of the jet with an excess air coefficient approaching to 1. Experimental results show that the average excess air coefficient in the recirculation zone is about 1.29, and the combustion efficiency reaches more than 99% at the end of the recirculation zone when the overall excess air coefficient is 10.5, even under the low pressure and temperature conditions. These results demonstrate an effective improvement of the combustion efficiency at off-design conditions by the method proposed in this paper. In addition, the flow field structure under the interaction of circular transverse jet with mainstream, the distribution characteristics of gas components and temperature in the combustion zone are studied, which laid the foundation for the further study and the engineering application of this method.
KW - Circular transverse jet
KW - Combustion efficiency
KW - Excess air coefficient
KW - Mixing coefficient
KW - Recirculation zone
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U2 - 10.1016/j.icheatmasstransfer.2021.105207
DO - 10.1016/j.icheatmasstransfer.2021.105207
M3 - RGC 21 - Publication in refereed journal
SN - 0735-1933
VL - 123
JO - International Communications in Heat and Mass Transfer
JF - International Communications in Heat and Mass Transfer
M1 - 105207
ER -