ANALISIS KEBISINGAN JET DI NOZZLE CHEVRON DENGAN SIMULASI LARGE EDDY

Fathoni, Nabiel (2023) ANALISIS KEBISINGAN JET DI NOZZLE CHEVRON DENGAN SIMULASI LARGE EDDY. Thesis thesis, Institut Teknologi Dirgantara Adisutjipto.

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Abstract

Noise at the nozzle occurs due to fluctuations in air velocity and pressure caused by turbulent nozzle flow. Noise analysis on the nozzle is important so that it can minimize the noise. This study was conducted to obtain a comparison of sound pressure level (SPL) between the chevron nozzle and nozzle without a chevron and determine the efficiency of the chevron nozzle in suppressing noise levels. In this study, 3 receivers and an air velocity of 188.65 m/s were used. The turbulent flow approach was analyzed using the Large Eddy Simulation method and the acoustic approach using the Ffowch William and Hawkings (FWH) method. The nozzle variations used in this study are SMC000, SMC002, SMC003, SMC006, and SMC007. The results obtained from this simulation are Sound Pressure Level, contour velocity, contour static pressure, and contour dynamic pressure. The results showed that the highest noise occurred at the chevron nozzle variation SMC007 of 87.5 dB and the lowest noise occurred at the chevron nozzle variation SMC003 of 87.5 dB. The data shows that the chevron nozzle variation SMC003 is more efficient in suppressing the noise level produced by the jet engine. The geometry of this variation has 10 chevrons with a chevron angle of 5⁰ and a chevron length of 7.11 mm. This research is useful to understand the comparison of chevron nozzle and without chevron, the effect of various chevron nozzle variation.

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