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This paper deals with the application of 1-D simulation technique for prediction of engine performance at high altitudes. 1-D engine simulation is an important tool for engine development activities. Engine design through simulation can substantially cut down time needed to execute experiments and prototyping, as todays softwares can simulate most of the experiments. This approach was applied for simulation of a spark-ignited engine for UAV. A detailed 1-D thermodynamic model was prepared for the engine configuration in Ricardo WAVE environment; different simulation runs were executed and then performance parameters like brake power, torque, specific fuel consumption, BMEP, in-cylinder pressure etc. were predicted. In 1-D simulation technique, predicted performance shall always be co-related with test results for correct interpretation.

Suitability of the compression ignition engine for biodiesel fuel based operation has been discussed in several studies. However, studies focusing on the physical characterization of exhaust particulates from engine operating with bio-diesel blends are limited. This study characterizes the particulate emissions in terms of particle size distribution from a compression ignition engine operating on diesel and bio-diesel of two different origins namely Jatropha and Karanja in the form of 20% blends, as a function of loading. A ten-stage inertial impactor (MOUDI) was used to obtain particle size distributions. It was observed that particle mass concentrations of sub-micron particles are higher for higher loading conditions. Further, test results indicated that contribution of PM2.5 particles to the exhaust to the total particulate mass varied from 75% to 95% for the load conditions used in the study.