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This paper reports experimental studies on acoustic characteristics of turbulent jet flow over different length wall surfaces. Four plates are considered and plate lengths are varied in the range 5 to 20 nozzle exit height. Besides variations in length of surface, acoustic emissions along the stream-wise directions of each wall surfaces are quantified. Spectral variations along the flow directions are estimated by traversing microphone along the flow direction. The results demonstrates that shorter plate is nosier compared to other plates and by varying the length low frequency noise emissions are decreasing. Further, it is found that sound pressure levels of wall jets along the stream-wise directions are showing decreasing trend.
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