Abstract—The variations in mean velocity profiles of the x component along x-axis of the four jets at the designed Mach number is discussed in this research paper. It is found that the velocity profiles are fairly symmetrical about y=0. The velocities and its gradients decay along x-axis. Due to the effect of entrainment in the shear layer, the velocity between four jets increases with x-axis. It observed that the dynamic pressure inside the nozzle, just before the exit of the jet is maximum where the velocity of flow is maximum while in space between two nozzles is less and near the nozzle wall the static pressure is maximum. The static pressure inside the nozzle is minimum. It decreases with velocity increase, while static pressure is more in the space between the two jets in compression to flow domain. The jet is designed for streamline flow and hence the intensity of turbulence is less inside nozzle as compared to atmosphere. The turbulence intensity has value of 3.43x103 (%) at nozzle exit. This is because of the eddy creation and reversal of flow at the base region of circular duct. Further downstream, as flow gets agitated and the turbulence intensity increases. A maximum of 6.78x103(%) is attained and beyond which the turbulent intensity goes on decreasing steadily.
Index Terms—four jet, Mach number, De Laval nozzle, turbulence intensity, flow reversal.
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Cite: K. M. Pandey and Virendra Kumar, "CFD Analysis of Four Jet Flow at Mach 1.74with Fluent Software," International Journal of Chemical Engineering and Applications vol. 1, no. 4, pp. 302-308, 2010.
