PENGARUH JUMLAH CHEVRON PADA NOZZLE TERHADAP KEBISINGAN DENGAN LARGE EDDY SIMULATION

Harviz Nugraha, Riyanda (2024) PENGARUH JUMLAH CHEVRON PADA NOZZLE TERHADAP KEBISINGAN DENGAN LARGE EDDY SIMULATION. Skripsi thesis, Institut Teknologi Dirgantara Adisutjipto.

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Abstract

Noise that occurs at the nozzle is caused by fluctuations in air velocity and pressure generated by turbulent nozzle flow. In general, all noise comes from pressure fluctuations in unsteady flow. This study was conducted to obtain a comparison of sound pressure level (SPL) between the chevron nozzle and nozzle without chevron. The turbulent flow approach was analyzed using an acoustic approach using the Ffowch William and Hawkings (FWH) method and the Large Eddy Simulation method. The results obtained from this simulation are Sound Pressure Level, contour velocity, contour static pressure, and contour dynamic pressure. In this study, it is proven that the number of chevrons on the nozzle is very influential in reducing the noise level caused by fluctuations in air velocity and pressure in the flow generated by the nozzle. The results showed that the lowest noise occurred in the chevron nozzle variation SMC003 of 76.27 dB and the highest noise occurred in the chevron nozzle variation SMC001 of 105.95 dB. The data shows that the chevron nozzle variation SMC003 with the number of 8 chevrons is more efficient in suppressing the noise level generated by the jet engine.

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