Abstract
This study involves the analysis of the performance improvement of the air-cooled SI engine by controlling the charge temperature. The insulated intake manifold has been used to maintaining the charge temperature at the atmospheric temperature level. The effect of variation in intake air temperature coming from atmospheric temperature on the engine performance in terms of brake mean effective pressure, engine power, engine torque are investigated. The result indicated that the mass flow rate of air is increased after using cold and insulated air intake system with average air density of 1.174 kg/m3. This improved air intake mass flow rate increased the brake torque and a reduction in exhaust gas emission. The result shows when the air-fuel mixture allowed for combustion at atmospheric intake air temperature (30ºC), the engine produces 1.2003 kW power and 5.7314 N-m torque at 2000 rpm. The engine performance calculated at an engine speed of 1000, 1500 and 2000 rpm.
Highlights
For a continuation and efficient SI engine operation, the heat transfers after the combustion are extremely important
The temperature of the air-fuel charge affects the performance of the single-cylinder air-cooled SI engine
It is true that the moderate temperature of the charge helps to prepare a homogeneous charge for, instantaneous and complete combustion
Summary
For a continuation and efficient SI engine operation, the heat transfers after the combustion are extremely important. The air-cooled engine transfers the heat by conduction and radiation caused the nearby components like intake manifold, carburetors, and air filter box get heated This preheated intake air and air-fuel charge increase the pre cyclic temperature of the IC engine [11]. The moderately heated intake air system, slightly more than the atmospheric temperature increases the fuel evaporation rate which is helpful to mix oxygen moles present in the air with each fuel particles and give homogeneous mixture [12]. There is a reduction of the density of the charge with an increase in mixture temperature, which further decreases the combustion pressure reducing the tendency to detonate.The exact proportion of the energy supplied to the engine (as fuel) which is converted into useful work is critically influenced by many physical characteristics of the engine such as engine design, type of the fuel used, Cooling system, etc. For water-cooled engines, the temperature of the cylinder head should not exceed about 270°C while for air-cooled engines, which use light alloys, this limit is as low as 200°C
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