A Numerical Investigation of Effects of Different Nozzle Spacing on Turbulent Flow in a Novel Circular Jet Mixer

In order to investigate the flow characteristic in a novel circular jet mixer (CJM), the three-dimensional flow field of CJM with different nozzles spacing are investigated using CFD. The effects of different distances of nozzles are evaluated by the turbulent flow index, such as velocity and the self-similarity of the axial velocity, through the jet plane. Results show that larger nozzle spacing needs a longer jet length to complete the combination of the three jet flow, compared to the lower distance of nozzles. A linear equation is obtained to describe the attenuation of the axial velocity on different nozzles spacing. The self-similarity of the velocity at nozzles spacing is H₀/D_j=5 present a similarity to the free turbulent jet. The conditions of multi-nozzle turbulent flow also give help to investigate the mixing effects in the CJM.