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Increasing thermal efficiency in diesel engines through low heat rejection   concept is a feasible technique. In LHR engines the high heat evolution is   achieved by insulating the combustion chamber surfaces and coolant side of   the cylinder with partially stabilized zirconia of 0.5 mm thickness and the   effective utilization of this heat depend on the engine design and operating   conditions. To make the LHR engines more suitable for automobile and   stationary applications, the extended expansion was introduced by modifying   the inlet cam for late closing of intake valve through Miller’s cycle for   extended expansion. Through the extended expansion concept the actual work   done increases, exhaust blow-down loss reduced and the thermal efficiency of   the LHR engine is improved. In LHR engines, the formation of nitric oxide is   more, to reduce the nitric oxide emission, the internal EGR is incorporated   using modified exhaust cam with secondary lobe. Modifications of gas exchange   with internal EGR resulted in decrease in nitric oxide emissions. In this   work, the parametric studies were carried out both theoretically and   experimentally. The combustion, performance and emission parameters were   studied and were found to be satisfactory

thermal science/thermal science

Analysis of combustion performance and emission of extended expansion cycle and iEGR for low heat rejection turbocharged direct injection diesel engines