The Effect of Turbulence on the Emissions of an Insulated DI Diesel Engine With Insulted Combustion Chamber
S.Sunil Kumar Reddy1, V. Pandurangadu2, S.P. Akbar Hussain3
1S. Sunil kumar Reddy, Associate Professor, Mechanical Department, N.B.K.R.I.S.T, Vidyanagar, Nellore, (A.P). India.
2Dr. V. Pandurangadu, Professor, Mechanical Department, Jawaharlal Nehru Technological University, Anantapur. (A.P). India.
3S.P. Akbar Hussain, Associate Professor, Mechanical Department, N.B.K.R.I.S.T, Vidyanagar, Nellore, (A.P). India.
Manuscript received on March 02, 2013. | Revised Manuscript received on April 13, 2013. | Manuscript published on April 30, 2013. | PP: 36-40 | Volume-2, Issue-4, April 2013. | Retrieval Number: D1266042413/2013©BEIESP

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Abstract: The available petroleum fossil fuels are rapidly depleting and also creating much pollution. As our country is producing sugar cane more, this leads to the recognition of alcohols as an alternative fuels to diesel in diesel engines because these are derived from indigenous sources and are renewable. However due to alcohols lower cetane number and high latent heat of vaporization, it won’t vaporize in the existing diesel engines ; it requires higher temperatures in the combustion chambers for the combustion. So in the present work a thermally insulated engine (IE) is developed which reduces the ignition delay and aids combustion. In an insulated engine, the energy loss is avoided by applying a layer of insulating material over the components (air gap piston and ceramic coated cylinder head, valve and cylinder liner) of the combustion chamber. This improved the efficiency of the engine and further reduces the emissions. Tests are conducted on a single cylinder 4-stroke water cooled 3.68 KW diesel engine with alcohol as a fuel. Due to lower viscosity of alcohol the fuel injection pressure is reduced to165 bar for the experimentation. Further the efficiency of the engine can be improved by providing turbulence in the combustion chamber. So in the present work the turbulence is provided in the combustion chamber with grooves on the piston insert. So during the experimentation brass piston with various numbers of grooves is used on the test engine with an objective to find the best one in terms of performance, emissions and other combustion parameters with alcohol as fuel. For comparison the engine is also operated with brass piston. Out of all these pistons tested, one of them (brass Piston with 9 grooves) is found to be best in terms of efficiency and emissions.
Keywords: Air-gap insulation, alcohol, ceramics, grooves and Insulated engine.