International Journal of Environmental Science and Development

Abstract—The variations in mean velocity profiles of the x component along x-axis of the twin jets at the designed Machnumber is discussed in this research paper. The variations in mean velocity profiles of the x component along x-axis of the twin jets at B=9 and Me 1.74 are discussed, where maximumvelocity 5.97x102 at the exit of the jet. 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 two jets increases with x-axis. At the same time, the width of twin jets was found to increase. It observed that the static pressure inside the nozzle is minimum where the velocity of flow is maximum while in gap between two nozzles and near the nozzle wall the static pressure is maximum. The dynamic pressure increases with increase of velocity, the dynamic pressure is maximum just before the exit of jet i.e., 2.30x105 Pa. The jet is designed for streamline flow and hence the intensity of turbulence is less inside nozzle as compared to flow regime. The turbulence intensity has high value of 2.37x103(%) 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 of7.7x103 (%) is attained and beyond which the turbulent intensity steadily decreases. While the turbulence of kinetic energy range 1 to 8.9x103 m²/s².

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 Twin Jet Flow At Mach 1.74 with Fluent Software," International Journal of Environmental Science and Development vol. 1, no. 5, pp. 423-428, 2010.