Technical Paper
Combustion and Soot Visualization of Low Temperature Combustion within an HSDI Diesel Engine Using Multiple Injection Strategy
2006-04-03
2006-01-0078
Low Temperature Compression Ignition (LTCI) combustion employing multiple injection strategies in an optically accessible single-cylinder small-bore High-Speed Direct-Injection (HSDI) diesel engine equipped with a Bosch common-rail electronic fuel injection system was investigated in this work. Heat release characteristics were analyzed through the measurement of in-cylinder pressure. The whole cycle combustion process was visualized with a high-speed digital video camera by imaging natural flame luminosity and three-dimensional like combustion structures were obtained by taking flame images from both the bottom of the optical piston and the side window. The transient in-cylinder late cycle soot distribution was obtained by applying a Backward Illumination Light Extinction (BILE) technique through side windows. Based on the flame luminosity and soot spatially integrated signal, new parameters were defined to evaluate the combustion performance and soot formation characteristics.