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Increased options and flexibility in common rail direct injection provides a great opportunity for combustion optimization using fuel and air system with proper combustion chamber configuration. This paper elaborates the experimental work conducted for combustion optimization with combinations of piston bowl, intake port swirl, injector specifications and turbo charging on a 3.8 l four valve diesel engine of LDT application equipped with common rail fuel injection system and waste gate turbo charge. In meeting the target emission norms with internal engine measures, the design of the piston bowl and the nozzle configuration perform a defining role. Through simulations the best option had been carried out parametrically investigate the influence of piston bowl geometry and nozzle characteristics on the performance of the combustion system.

The demand for reduced pollutant emissions has motivated various technological advances in commercial diesel engines. The challenge for the direct injection diesel engines today is to reduce harmful emissions of diesel engines, such as Particulate Matter (PM) and Nitrogen oxides (NOx), and enhance the fuel efficiency and power. To meet this challenge, more accurate control of injection parameters such as the injection timing, injection rate, and injection quantity is required. A comprehensive study is carried out in order to better understand combustion behavior in a direct injection diesel engine working under different injection strategies particularly with post and pre-injections and number of injection. The objective of the study described in this paper is to explore the potential of multiple injection patterns with a common rail system in light duty diesel engines.