International Journal of Modern Engineering Research (IJMER) www.ijmer.com Vol.3, Issue.2, March-April. 2013 pp-674-677 ISSN: 2249-6645 www.ijmer.com 674 | Page S.Sunil Kumar Reddy, 1 Dr. V. Pandurangadu, 2 S.P.Akbar Hussain 3 13 Associate Professor, Mechanical Department, N.B.K.R.I.S.T, Vidyanagar, Nellore, A.P 2 Professor, Mechanical Department, Jawaharlal Nehru Technological University, Anantapur. A.P Abstract: The world’s rapidly dwindling petroleum supplies, their raising cost and the growing danger of environmental pollution from these fuels have led to an intensive search for an alternative fuels with concerned efforts to conserve the oil reserves. Among all the fuels, tested alcohol is proved best alternatives to the petroleum fuels because all these are derived from indigenous sources and are renewable. However, with the alcohols higher latent heat of vaporization and lower cetane number, the Insulated engine (IE) is used for the combustion in the diesel engines. The higher temperature in the combustion chamber decreases the ignition delay and aids combustion but drops the volumetric efficiency. The degree of degradation of volumetric efficiency depends on the temperatures in the combustion chamber and it further increases the frictional horsepower due to thinning of lubricant. Therefore, for improving the thermal efficiency of insulated engine, the volumetric efficiency drop is compensated by turbo charging in the present experimental work. This gave the better performance with reduction in smoke. With the turbo, charging the intake boost pressure is raised and its effect on the engine performance is also studied. I. Introduction In the diesel engines for about 30% of the total energy is lost to the cooling water. This lost energy can be recovered in the form of useful energy by expanding gases in the turbines. But due to lower temperature in the combustion chambers, the fuels which have high calorific value cannot be burned. This can be achieved with an insulated engine due to the availability of higher temperature at the time of fuel injection. The heat available due to insulation can be effectively used for vaporizing alcohols. Some important advantages of the insulated engines are improved fuel economy, reduced HC and CO emission, reduced noise due to lower rate of pressure rise and higher energy in the exhaust gases [2 & 3]. However, one of the main problems in the insulated engines is the drop in volumetric efficiency. This further decrease the density of air entering the cylinder because of high wall temperatures of the insulated engine. The degree of degradation of volumetric efficiency depends on the degree of insulation. In the present work for compensating the decrease in volumetric efficiency a single cylinder insulated DI diesel engine is turbocharged to different inlet pressures depending upon the load and the performance of the insulated engine under turbocharging condition is investigated. II. Experimental Details The single cylinder, four strokes 3.68 KW Kirloskar, water-cooled DI diesel engine with a bore of 80 mm and stroke of 110 mm and a compression ratio of 16.5:1 is used for the experiment. The engine load is applied with eddy current dynamometer. For the reduction of heat to the cooling water, an air gap insulated piston and liner and ceramic-coated cylinder head and valve (BP9) is used for this experimental investigation. The emissions are measured with exhaust analyzer. The air gap insulated piston and the experimental set up used for the experiment is as shown in the Fig.1 & 2 respectively Fig. 1: Photographic view of Aluminum Fig. 2. Experimental set up of Insulated piston Crown with an air-gap insulation Engine Test Rig Effect of Turbo charging On Volumetric Efficiency in an Insulated Di Diesel Engine For Improved Performance