Abstract
The present study investigates the acoustic emission of an underexpanded jet impinging on plates of different geometries/configurations, for a range of nozzle pressure ratios. An optimization problem is carried out using the response surface methodology to determine the flow and geometric parameters that would minimize the overall sound pressure level. The two-factor optimal method is used first to determine the optimum nozzle pressure ratio and standoff distance to minimize the overall sound pressure level. Later the three-factor optimal method is used by taking the pitch length of the impinging plate as a design variable along with standoff distance and nozzle pressure ratio to minimize the overall sound pressure level. Experiments are conducted based on the design matrix, and the sound pressure level is calculated from the acoustic pressure data. The results are optimized, and the quadratic, cubic and quartic models are obtained to predict the response for different input parameters.
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Abbreviations
- D :
-
Jet diameter (mm)
- H:
-
Non dimensional Standoff distance (Standoff distance/Jet diameter)
- OASPL:
-
Overall sound pressure level (dB ref 20 μPa)
- L:
-
Pitch length
- NPR:
-
Nozzle pressure ratio
- SPL:
-
Sound pressure level
- RSM:
-
Response surface methodology
- DOE:
-
Design of experiments
- BBSAN:
-
Broadband shock associated noise
- Df:
-
Degree of freedom
- P:
-
Probability against null hypothesis
- 2FI:
-
Two factor interaction
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Sarangi, D., Karthik, R. & Srinivasan, K. Optimization of overall sound pressure level of underexpanded impinging jets at low and moderate Mach numbers. J Braz. Soc. Mech. Sci. Eng. 46, 29 (2024). https://doi.org/10.1007/s40430-023-04568-1
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DOI: https://doi.org/10.1007/s40430-023-04568-1