Abstract
This paper presents an acoustic measurement experiment to investigate noise characteristics of jets impinging on conical obstacles of different cone angles. Besides cone angle, effects of impinging velocity and impinging distance are also studied. Overall sound pressure level (OASPL) and noise spectrum are analyzed. The results suggest that effects of cone angle on noise characteristics of the impinging jet are mainly related to the impinging distance. The main spectrum characteristic for impinging jet cases is of broadband characteristic in the middle and high frequency bands. Further, compared to the free jet case, main acoustic sources of the impinging jet for three cone angle cases are discussed under different impinging distances, combined with flow field analysis and spectrum analysis. Finally, a detailed noise directivity study is carried out. The OASPL of impinging jet for different cone angle cases is presented under various impinging distances and monitoring point positions.
Highlights
Impinging jets are widely applied in many engineering and practical problems such as heating and cooling in industrial process, drying of textile and paper, preparation of transistors, and the take-off of rockets and aircrafts.[1]
In order to effectively investigate the variation of acoustic characteristics with cone angle, overall sound pressure level (OASPL) of jets impinging on the conical obstacles of different cone angles is measured at various impinging distances and impinging velocities
Noise characteristics of impinging jet on the conical obstacle are experimentally investigated by varying parameters such as cone angle (α=60◦, 90◦ and 120◦), impinging velocity and impinging distance (X/D=1, 2, 5, 10 and 20)
Summary
Impinging jets are widely applied in many engineering and practical problems such as heating and cooling in industrial process, drying of textile and paper, preparation of transistors, and the take-off of rockets and aircrafts.[1]. In the last two decades, a large list of studies are about the noise characteristics and source mechanics of a supersonic jet impinging on the plate. Dhamanekar[2] experimentally investigated the noise characteristics of jets impinging on inclined plates of various surface roughness values. Akamine[5] investigated the effect of nozzle-plate distance on the difference in the broadband acoustic field from a supersonic jet impinging on an inclined plate. The motivation for this paper is to experimentally investigate the acoustic characteristics of low-speed jets impinging on conical obstacles of different cone angles.
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