Abstract
This paper describes an experimental study of dual scale-model jets impinging on a ground plane. The two jets consist of a front jet issuing from a contoured converging nozzle and a rear jet issuing from a converging-diverging nozzle with the design Mach number of 1.3. The dual impinging jets are individually operated at various jet Mach numbers during the experiments. The fundamental characteristics of the flow field produced by the dual impinging jets on the ground plane are investigated by Schlieren and chalk flow visualizations and steady pressure surveys on a lift plate and ground plane. A far-field microphone array (composed of 23 microphones) is used to quantify the far-field acoustics at various locations relative to the dual impinging jets with different distances between the nozzle exit to the ground plane. The purpose of studying dual supersonic impinging jets is to have an overall understanding of the corresponding flow field and acoustic field for the development of a short take off and vertical landing aircraft.
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