A comparative experimental study on engine operating on premixed charge compression ignition and compression ignition mode

Abstract

New combustion concepts have been recently developed with the purpose to tackle the problem of high emissions level of traditional direct injection Diesel engines. A good example is the premixed charge compression ignition combustion. A strategy in which early injection is used causing a burning process in which the fuel burns in the premixed condition. In compression ignition engines, soot (particulate matter) and NO x emissions are an extremely unsolved issue. Premixed charge compression ignition is one of the most promising solutions that combine the advantages of both spark ignition and compression ignition combustion modes. It gives thermal efficiency close to the compression ignition engines and resolves the associated issues of high NO x and particulate matter, simultaneously. Premixing of air and fuel preparation is the challenging part to achieve premixed charge compression ignition combustion. In the present experimental study a diesel vaporizer is used to achieve premixed charge compression ignition combustion. A vaporized diesel fuel was mixed with the air to form premixed charge and inducted into the cylinder during the intake stroke. Low diesel volatility remains the main obstacle in preparing premixed air-fuel mixture. Exhaust gas re-circulation can be used to control the rate of heat release. The objective of this study is to reduce exhaust emission levels with maintaining thermal efficiency close to compression ignition engine.

Operating parameters optimization for lower emissions in diesel engine with PCCI-DI mode using Taguchi and grey relational analysis

“…Relatively promising lower percentage increments of 27.49% and 33.18% in HC and CO results respectively were found in comparison to the average previous studies on PCCI combustion. Minimized HC and CO percentage increments are promising results comparing with most previous studies having more than 30% increments even more than 100% increments [ 34 , 35 ].…”

Experimental Investigation on Impact of EGR Configuration on Exhaust Emissions in Optimized PCCI-DI Diesel Engine

“…From other research on PCCI operation, 25 °BTDC of injection timing and IMEP of 287 kPa was found best due to the reasons: lower NOx production of 3.1 g/kWh and lower CO and HC including lower smoke emissions [5]. Studies revealed that HC and CO emissions were found out 30 times greater in the PCCI type of combustion compared with the conventional CI mode of combustion [6,7].…”