Performance Analysis of Heavy Duty SPFI CNG Engine Manifold System

The primary modifications are required in Internal Combustion Engine System viz intake manifold, piston and Exhaust after treatment system to obtain optimum power, torque, fuel efficiency and to reduce harmful emission gases. These parameters are responsible for improvement in the performance of Engine. The purpose of the intake manifold is to distribute air-fuel mixture uniformly for all cylinders. The paper aims to design Intake Manifold and investigate the effect of Fuel Injection location and Air-Fuel mixture on the Performance of the CNG Single point fuel injection Engine. The intake manifold is modeled using reverse engineering data. The manifold system is analyzed for stress and deflection. The AirFuel mixture is evaluated using Computational Fluid Dynamics analysis based on the uniformity index by varying injection location. The effects of turbulence are represented by k-Ɛ turbulence model. The Engine Performance is estimated using 1D simulation software and the results are compared with Experimental results. Keywords—Intake Manifold, SPFI, CFD, Uniformity Index, Design of Injection Location