The opposed jets flow is measured and its CFD simulation is performed to study the flow property in a gas turbine combustor. The jets are oppositely flowed into a one-side-closed rectangular duct. In order to understand the whole combustor flow field it is necessary to study air jet dilution effects which are typically arranged by opposed jets. Experiments and simulations are performed using air, where the average Reynolds number is 2×10~4, which is based on jet diameter and jet velocity. Velocity distribution and turbulent intensity are measured by Laser Doppler Velocimetry and simulated by a large-eddy simulation. LES results are generally in qualitative agreement with the experiment. Thus, the simulation was carried out to discuss an effect of momentum flux ratio J. In this study, the values of J are set at 4, 9,16, and 64. The result of unmixedness is the highest in the case of J= 4. The reason is that the mixing intensity is not enhanced by collision of opposed jets, since the penetration is weak in the case of J=4. The reason is that the mixing intensity is not enhanced by collision of opposed jets, since the penetration is weak in the case of J=4. In the case of 9-64, it is proposed the behavior of mixing is classified by value of J.
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