Experimental investigation reveals velocity decay and mixing performance of SERN in low supersonic flows, indicating potential for improved propulsion efficiency.
This experimental study investigates the velocity decay characteristics and mixing performance of a Single Expansion Ramp Nozzle (SERN) operating at low supersonic speeds. A SERN model with a 20° ramp angle and a one-hour cowl was created and tested over a range of low Nozzle Pressure Ratios (NPRs) of 3 to 6. The primary goal was to map the entire pressure field and measure the rapid loss of kinetic energy (velocity decay) downstream from the nozzle exit. A Pitot tube with a three-dimensional traverse mechanism was utilized to collect total pressure data along mutually perpendicular transverse axes at various axial locations (X/h and z/h). To ensure accuracy, a high-precision pressure scanner and indicator were utilized. Important data for assessing the SERN's performance at improving jet-ambient fluid mixing. The findings provide knowledge needed to adjust SERN geometry for increased propulsion efficiency.
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Samykkannu et al. (2026) studied this question.
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