Modeling for combined effect of muffler geometry modification and blended fuel use on exhaust performance of a four stroke engine: A computational fluid dynamics approach

A computational fluid dynamic model is developed to study the effect of muffler geometry modification on key exhaust parameters of an engine. Such engine is powered with blend of methanol and petrol. The muffler geometry such as: chambered straight (CS), chambered elliptic (CE), turbo straight (TS) and turbo elliptic (TE) are designed for analysis. The combined effect of muffler geometry modification and blended fuel use on back pressure, chamber temperature and velocity are discussed in detail. The result shows that the chambered elliptic muffler using B5 (5% methanol) developed least exhaust temperature. Whereas, the gas density is least in case of turbo elliptic muffler using B15 (15% methanol). Finally the velocity is highest in case of chambered elliptic muffler using B5 blend.