Design and optimization of muffler back pressure

Abstract

This study investigated engine exhaust backpressure that affects the performance and emission of an IC engine under different speeds and load conditions. The function of an exhaust muffler is responsible for noise and emission reduction of the IC engine. Backpressure is essential to reduce to increasing the engine fuel utilization. During the exhaust stroke, the average pressure in the exhaust pipe is known as mean exhaust pressure and the atmospheric pressure is also known as ambient pressure. Atmospheric pressure is also known by the word barometric pressure. The difference between exhaust pressure and ambient pressure denoted by word backpressure. The backpressure continuously varies depending upon engine speed and load conditions. Due to rotations and chances of the exhaust gas has to spread the atmosphere air, there is a substantial quantity of backpressure which limits the allowed flow of the exhaust gases. It is an essential thing to decrease the backpressure. The main design concern is to make sure that the backpressure to be minimum. The exhaust mufflers were designed using Solid Works 2018. Arithmetical analysis for backpressure tested by Computational fluid dynamics (CFD) using FLUENT. The analyses were carried out for existing and optimized mufflers to find better muffler design for lesser back pressure. Therefore, backpressure up to a positive level is not harmful to an IC engine.