Abstract
Subsonic turbulent free jet, issuing from a lobed contoured nozzle in to quiescent air is investigated experimentally. Results are compared with a cir ular jet from a nozzle of the same exit area and same contraction profile. Mean flow characteristics, turbulence intensities and Reynolds shear stresses in the near field region are investigated by using Hot-wire Anemometry. An overall decrease in turbulence intensities and enhanced flow entrainment in the near field of lobed nozzle are observed.
Highlights
Turbulence intensities and Reynolds shear stresses in the near field region are investigated by using Hot-wire Anemometry
In many industrial applications, such as in ejectors, propulsive systems and HVAC systems, efficiency is strongly related to the mixing properties of the jet flow
Non-circular jet exit geometries can be used for various performance improvements, such as; noise reduction, combustion efficiency enhancement and heat transfer augmentation in many practical applications since they are capable of entraining large amount of surrounding fluids
Summary
In many industrial applications, such as in ejectors, propulsive systems and HVAC systems, efficiency is strongly related to the mixing properties of the jet flow. Hussain and Hussain [4,5] examined, the vortex structure, switching process and vortex pairing phenomenon in elliptic jets They found that the location and number of switchovers are strongly dependent on the initial conditions. Experimental results of Quinn, concentrated on sharp edged elliptical [6] and triangular [7] nozzles, show that the jet attains axisymmetric shape after one or two switches of major and minor axis. These studies reveal that, the shape of the exit nozzle is very important in mixing and entrainment phenomenon
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