Abstract
The current study discusses the experimental results of the effect of two types of nozzle internal geometries. The first configuration uses a common inlet that diverges the flow into two separate channels that feed twin rectangular nozzles, and the second configuration has the plug flow type system with twin rectangular nozzles drawing air from a common plenum. The nozzles are converging diverging type with design Mach number of 1.5. Flow conditions encompassing overexpanded, design, and underexpanded conditions are tested with acoustic data collected in the farfield and nearfield domains. High-speed Schlieren imaging is used to visualize the effect of internal geometry on the development of the jet shock cell structure and twin jet interaction. The variations in the Overall Sound Pressure Level (OASPL), frequency spectra, and jet phase coupling are used to quantify the effect of the internal geometries. This is supplemented by Spectral Proper Orthogonal Decomposition (SPOD) results obtained from the Schlieren images to quantify the variations in flow development.
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