TY - JOUR
TI - Analysis of combustion performance and emission of extended expansion cycle and iEGR for low heat rejection turbocharged direct injection diesel engines
AU - Shabira Mohd F
AU - Prasath B Rajendra
AU - Tamilporai P
JN - Thermal Science
PY - 2014
VL - 18
IS - 1
SP - 129
EP - 142
PT - Article
AB - 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.