Investigation of combustion chamber profile induced thermal performance and vibration in diesel engine

Abstract

The function of an engine is to produce mechanical power. When newlinethe fuel is burnt, heat is released. This heat energy is converted into useful newlinework. The details of the engine design are varying significantly over the size newlineof diesel engine. In particular, different combustion chamber geometries and newlinefuel-injection characteristics are required to deal effectively with a major newlinediesel engine design problem, achieving sufficiently rapid fuel-air mixing newlinerates to complete the fuel-burning process in the time available. A wide newlinevariety of inlet port geometries, cylinder head and piston shapes, and fuelinjection newlinepatterns are used to accomplish this over the size of diesel engine. newlineCombustion chamber profile changes are considered technologically newlineimportant because of their ability to further increase in diesel engine working temperatures and reduce cooling requirements, thus achieving higher engine newlineefficiency, lower emission and increased performance. newlineThe vibration of engine also depends on the combustion newlinephenomena and then the piston profile. The force acting on piston is varying newlinedepends on the piston profile area for the same pressure inside the cylinder. newlineBy this way combustion chamber profile otherwise the piston crown profile is newlinevery important to get a favourable performance in terms of thermal and newlinevibration aspects. The combination of thermal performance, simulation of incylinder newlineflow and vibration data are not available for use. A new design newlineapproach adapted for compromising the thermal performance and vibration behaviour of the engine. Four different piston profiles were selected newlinefor the experimental work as well as the simulation work. All pistons were newlinefitted in engine and the performance parameters along with emission newlineparameter were recorded. The specific fuel consumption, thermal efficiency, newlinemechanical efficiency and NOx were obtained from the experiment. At the newlinesame time the vibration signal was collected and stored in the computer. newline