EXPERIMENTAL INVESTIGATION TO ANALYZE THE EFFECT OF VARIATION IN INTAKE AIR TEMPERATURE ON THE THROTTLE RESPONSE OF THE S.I. ENGINE

The performance of the naturally aspirated internal combustion gasoline engine at partially and full throttle depends on the atmospheric temperature and humidity of intake air. The combustion of the air-fuel mixture, being highly exothermic, leads to increasing the temperature of air intake assembly. This heated air intake assembly leads to an increase in the temperature of intake air which in turn causes knocking and other performance losses. Effective insulation of the air intake assembly may lead to an allowing the intake air at atmospheric temperature, into the engine for the efficient combustion. In this study, an efficient method to improve the performance of spark ignition engine at low speed by insulating the air intake assembly has been proposed. The effectiveness of the proposed insulated air intake assembly has been experimentally analyzed, and the results obtained are presented. The variation in different intake and performance parameters of the engine have been observed and recorded using LAUNCH C Reader VI code scanner. The experimental results have also been validated numerically through basic relationships governing the design of internal combustion (IC) engines. The paper presents the comparative analysis of the various engine performance parameters, before and after insulating the engine.