Spray and combustion analysis in a dici engine for various combustion chamber geometry

Abstract

The concerns from environmental degradation endanger the quality of life in modern society. The vision of engineers and scientists is to develop CI engine to provide maximum thermal efficiency and minimum emissions. A strict regulation is aiming to about 50% reduction from the current nitrogen of oxides and particulate matter. The vehicle and agriculture engine researchers focus on the improvement of the maximum engine output power. The design and manufacture of Direct Injection Compression Ignition (DICI) engine is significant for improvement of the maximum engine output power. The next generation of engines needs to be compact, powerful and flexible to produce less air pollution. In this aspect combustion chamber design is important to create swirl, squish and tumble movements. The flow pattern of air motion is important to enhance the complete combustion of air and fuel mixture. The experiments have been conducted using diesel, POME20 and POME as fuels in a spray chamber for different injection pressure from 180 bar, 200 bar and 220 bar by varying the chamber pressures are 42 bar, 44 bar, 46 bar, 48 bar and 50 bar to investigate the spray parameter such as spray penetration length, cone angle, spray area, spray volume, spray velocity and Sauter Mean Diameter (SMD). The motion of spray images of injected fuel in the high pressure chamber has been recorded using high speed camera employed with shadowgraph image processing technique. It is found that the effect of injection pressure POME has longer spray penetration as 75mm, higher spray area 4.38 mm2 and smaller cone angle10.5°compared to POME20 and diesel. It have been found that higher SMD 12.49and#956;m and larger the spray volume because of the fuel and faster than higher injection pressure. newline