Exhaust Emissions and Combustion Characteristics of Jatropha Oil in Crude Form and Biodiesel of Low Heat Rejection Diesel Engine
N. Janardhan1, P. Ushasri2, M. V. S. Murali Krishna3, P. V. K. Murthy4

1N.Janardhan, Mechanical Engineering Department Chaitanya Bharathi Institute of Technology, Gandipet, Hyderabad- 500075, Andhra Pradesh, India.
2P.Ushashri, College of Engineering, Osmania University, Hyderabad, India.
3M.V.S.Murali Krishna, Mechanical Engineering Department Chaitanya Bharathi Institute of Technology, Gandipet, Hyderabad-500075, Andhra Pradesh, India.
4P.V.K.Murthy, Mechanical Engineering Department Vivekananda Institute of Science and Information Technology, Shadnagar, Mahabubnagar Dist., Andhra Pradesh, India.
Manuscript received on February 08, 2013. | Revised Manuscript received on February 27, 2013. | Manuscript published on March 05, 2013. | PP: 91-95 | Volume-3 Issue-1, March 2013. | Retrieval Number: F1137112612/2013©BEIESP
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: Investigations were carried out to study the exhaust emissions of a low heat rejection (LHR) diesel engine consisting of air gap insulated piston with 3-mm air gap, with superni (an alloy of nickel) crown, air gap insulated liner with superni insert and ceramic coated cylinder head with different operating conditions of crude jatropha oil (CJO) and biodiesel with varied injection timing and injection pressure. Performance parameters and exhaust emissions were determined at various values of brake mean effective pressure (BMEP) with different versions of the engine with varied injection timing and injection pressure with different operating conditions of jatropha oil in crude form and biodiesel. Combustion characteristics of the engine were measured with TDC (top dead centre) encoder, pressure transducer, console and special pressure-crank angle software package at peak load operation of the engine. Conventional engine (CE) showed deteriorated performance, while LHR engine showed improved performance with crude vegetable operation at recommended injection timing and pressure and the performance of both version of the engine improved with advanced injection timing and higher injection pressure when compared with CE with pure diesel operation. Relatively, smoke levels decreased by 27% and NOx levels increased by 49% with crude vegetable oil operation on LHR engine at its optimum injection timing, when compared with pure diesel operation on CE at manufacturer’s recommended injection timing. Biodiesel operation further decreased smoke levels and increased NOx emissions.
Keywords: Alternate Fuel, CE, LHR engine, Vegetable oil.