Effect of diesel injection pressure for enhancing combustion and reducing mechanical vibration and noise emissions in a non-road diesel engine

Abstract

In this study, the combustion, performance, emissions, noise, and vibration characteristics of a single-cylinder, four-stroke, air-cooled diesel engine used for non-road purposes were investigated by controlling different injection pressures with a common rail fuel injection system. The aim of this study is to enhance the combustion performance and improve the existing noise and vibration levels of this commonly used non-road diesel engine in fields such as agriculture, wetlands, and the construction sector by optimizing the injection pressure. The experiments were conducted under low and medium load conditions and at a constant engine speed. The single-cylinder, non-road engine's fuel injection system was controlled using a common rail fuel delivery system, and four different diesel injection pressures (250, 300, 350, and 400 bar) were utilized. The experimental results have shown that the combustion performance, emissions, noise, and vibration values of the non-road diesel engine improved with an increase in diesel injection pressure (DIP). Increasing DIP led to higher maximum combustion pressures and resulted in reductions of HC, CO, and smoke emissions by up to 25%, 48%, and 59%, respectively. Vibration values also decreased by up to 25%.

Problems of operation of positive pressure ventilators on the basis of surveys of Polish officers of the State Fire Service

“…Noise-reducing rotor and stator geometries are being developed among ventilator designs 63 , 64 . On the other hand, in the midst of internal combustion engines, vibration and noise reduction is attempted by improving the combustion of the fuel–air mixture 65 , 66 , the design of mechanisms such as injection valves 67 or improving the damping of exhaust systems 68 . In the small-engine non-road designs used to drive rescue ventilators, the exhaust systems (which also dampen noise) through the compact design are quite small 69 , 70 .…”