ANALISIS EKSPERIMENTAL DAN SIMULASI NUMERIK KARAKTERISTIK PLASMA DALAM COMBUSTION CHAMBER

*Rizal Burhani Ilyas  -  Department of Mechanical Engineering, Universitas Diponegoro, Jl. Prof. Sudarto, SH, Tembalang, Semarang, Indonesia 50275, Indonesia
Susilo Adi Widyanto  -  Department of Mechanical Engineering, Universitas Diponegoro, Jl. Prof. Sudarto, SH, Tembalang, Semarang, Indonesia 50275, Indonesia
Mochammad Ariyanto  -  Department of Mechanical Engineering, Universitas Diponegoro, Jl. Prof. Sudarto, SH, Tembalang, Semarang, Indonesia 50275, Indonesia

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Abstract

Plasma combustion merupakan teknologi yang memanfaatkan gas terionisasi untuk meningkatkan efisiensi pembakaran melalui percepatan penyalaan, peningkatan stabilitas nyala api, dan perbaikan distribusi energi termal. Penelitian ini bertujuan menganalisis pengaruh variasi tekanan udara dan diameter outlet nozzle terhadap karakteristik aliran udara, distribusi tekanan total, dan distribusi temperatur pada plasma combustion chamber menggunakan pendekatan eksperimen dan simulasi numerik. Simulasi dilakukan dengan metode Computational Fluid Dynamics (CFD) pada ANSYS Fluent dengan variasi tekanan 1 hingga10 bar dan diameter outlet nozzle 1,5; 1,7; 2,0; 2,2; dan 2,5 mm. Model numerik divalidasi menggunakan data eksperimen panjang nyala plasma arc cutting melalui perhitungan Mean Absolute Percentage Error (MAPE) dan koefisien determinasi (R²). Hasil penelitian menunjukkan bahwa peningkatan tekanan meningkatkan kecepatan aliran, tekanan total, dan panjang distribusi temperatur. Pada tekanan rendah, diameter 2,0 mm menghasilkan kecepatan maksimum, sedangkan pada tekanan tinggi diameter 2,5 mm memberikan performa terbaik dengan tekanan total lebih tinggi dan distribusi temperatur lebih panjang. Hasil validasi menunjukkan nilai MAPE sebesar 0,9% dan R² 0,902, sehingga model numerik mampu merepresentasikan karakteristik plasma dengan baik.

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Keywords: aliran udara; computational fluid dynamics (cfd); distribusi temperatur; plasma combustion chamber; tekanan total
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