Experimental Investigations on LHR CI Diesel Engine with Varied Operating Parameters and its Simulation
A.Siva Kumar1, K.Vijaya Kumar Reddy2

1A.Siva Kumar, Professor, Department of Mechanical Engineering, MLR Institute of Technology, Dundigal, Hyderabad (Telangana), India.
2K.Vijaya Kumar Reddy, Professor, Department of Mechanical Engineering, JNTUHCEH, Kukatpally, Hyderabad (Telangana), India.
Manuscript received on 15 April 2013 | Revised Manuscript received on 22 April 2013 | Manuscript Published on 30 April 2013 | PP: 127-131 | Volume-2 Issue-5, April 2013 | Retrieval Number: E0684042413/13©BEIESP
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© The Authors. 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: Fuel consumption and the performance are two important in the dependent parameter for any internal combustion engines. The present future generation is being looking towards the pollution free environment. Hence there is a need to search suitable automotive engines to meet low emission levels in their long run. The demand for diesel engines is growing rapidly; therefore it is necessary to increase the fuel efficiency. It is known that, the most of energy developed in any IC engines during combustion is rejected through cooling media. To minimize this heat loss to the coolant, a low heat rejection concept was developed. In LHR engines the effective utilization of heat takes place due to insulation coatings applied to cylinder and piston. At the same time problems associated with LHR engines were solved due to its high combustion temperatures. Heavy exhaust blow-down energy and high NOx emissions were identified, which leads to decrease in thermal efficiency and inability to achieve emission legislation levels. The blow down losses can be overcome by using a concept of extended expansion cycle, in which the expansion ratio is greater than that of the compression ratio. This higher expansion ratio can be achieved by late closing of intake valve. In view of this the compression ratios for both LHR and LHR (EEE) engines are varied and compared with the conventional engine. The cumulative work done and thermal efficiency are high for conventional engines at lower compression ratios. The thermal efficiency is increased as the compression ratios increases for LHR and LHR (EEE) engines.
Keywords: LHR, LHR (EEE), Simulation, Crank Angle, Compression Ratios.

Scope of the Article: Operational Research