Analisis BackPressure pada Exhaust Team Horas USU dengan Variasi Magic Ring Menggunakan Simulasi Computational Fluid Dynamics (CFD)

Abstract

This study analyzes backpressure in the Team Horas USU exhaust system with variations in the number of holes in the magic ring using CFD simulation to understand its impact on pressure distribution, backpressure, and the thermal efficiency of the Yanmar L40AE-S diesel engine. The exhaust geometry was modeled using SolidWorks, meshed with ANSYS, and simulated using a CFD solver. The number of magic ring holes varied between 6, 8, and 10, with engine speeds ranging from 800 to 3100 rpm. The results indicate that increasing the number of magic ring holes reduces backpressure and results in a more uniform pressure distribution. The magic ring with 6 holes produced the highest backpressure of 3083 Pa at 2600 rpm and the lowest of 401 Pa at 800 rpm, while the 8-hole magic ring exhibited a maximum backpressure of 9246 Pa at 3100 rpm and a minimum of 2169 Pa at 800 rpm. The 10- hole magic ring recorded the highest backpressure of 3273 Pa at 3100 rpm and the lowest of 316 Pa at 800 rpm. In conclusion, increasing the number of magic ring holes can reduce backpressure and improve engine thermal efficiency by decreasing exhaust gas resistance. Future research is recommended to combine CFD simulations with experimental testing for more accurate and realistic data.