There is an extensive global effort to replace fossil fuel with blended fuel within existing engine configuration, yet conformed to available infrastructure. Though blended alcoholic fuel is able to reduce carbonated emissions (CO, CO2, unburnt HC), the NO_x level increased significantly due to enhanced exhaust temperature resulted out of better combustion. At Green Engine Technology Center, new exhaust mufflers are fabricated with/without perforation to find out if new design of muffler develops less temperature. The main objective of this study is to investigate feasibility of using perforation in diminishing surface temperature. To achieve this, a computational fluid dynamics model is developed to study the effect of perforation on exhaust performance of a turbo pipe type straight and elliptic muffler, fitted to engine running on petrol-methanol blend. The CFD analysis is done through a pressure based solver to study the effect of perforation on back pressure, density, temperature. Prior to the result analysis, the model is validated with a fabricated chamber type prototype muffler fitted to a four stroke single cylinder petrol engine. The temperature thus measured is matching with the simulated temperature. The muffler performance parameters such as back pressure, temperature, density, velocity stream line are studied for different blends (5%, 10%, 15%) of petrol and methanol. Clear variations of these parameters are observed between non perforated and perforated type turbo pipe mufflers.

全球在全球范围内进行了广泛的努力，以在现有发动机配置中以混合燃料代替化石燃料，同时又符合可用的基础设施。虽然混合的酒精燃料能够减少碳酸排放（CO，CO 2，未燃HC），则NO _X由于更好的燃烧导致排气温度升高，使废气排放水平显着提高。在绿色发动机技术中心，新的排气消声器被制造成带有/不带有穿孔的，以查明是否新设计的消声器产生的温度更低。这项研究的主要目的是研究使用穿孔降低表面温度的可行性。为此，开发了一种计算流体动力学模型，以研究穿孔对涡轮管式直线和椭圆形消音器排气性能的影响，该消音器适用于在汽油-甲醇混合物上运行的发动机。通过基于压力的求解器进行CFD分析，以研究穿孔对背压，密度，温度的影响。在进行结果分析之前，该模型已通过装配到四冲程单缸汽油发动机上的装配式腔体原型消声器进行了验证。如此测量的温度与模拟温度匹配。研究了汽油和甲醇的不同混合物（5％，10％，15％）的消声器性能参数，例如背压，温度，密度，速度流线。在非穿孔型和穿孔型涡轮增压管消声器之间观察到这些参数的明显变化。