Introduction To Diesel Engine

Introduction To Diesel Engine - Solar Energy International...

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Unformatted text preview: Solar Energy International Biodiesel Workshop Introduction to the Diesel Engine Diesel Vocabulary • Aftercooling / Intercooling • Turbocharging • Cetane Number • Cloud Point (CP) • Flash Point • Cold Filter Plugging Point (CFPP) • Pour Point • Compression Ignition (CI) • Direct Injection (DI) • In-Direct Injection (IDI) • In-Line Injection Pump • Nitrogen Oxides (NO x ) • Pump-Line-Nozzle Fuel System • Rotary Injection Pump • Unit Injector • Common Rail Injection What is a Diesel Engine? • Rudolf Diesel developed the idea for the diesel engine and obtained the German patent for it in 1892. • His goal was to create an engine with high efficiency . • Gasoline engines had been invented in 1876 and, especially at that time, were not very efficient • Both the gasoline and diesel engine utilize the process of internal combustion for power What is Internal Combustion? Four stroke cycle • Intake stroke : intake valve opens while the piston moves down from its highest position in the cylinder to its lowest position, drawing air into the cylinder in the process. • Compression stroke: intake valve closes and the piston moves back up the cylinder. This compresses the air & therefore heats it to a high temperature, typically in excess of 1000°F (540°C). Near the end of the compression stroke, fuel is injected into the cylinder. After a short delay, the fuel ignites spontaneously, a process called auto ignition . • Combustion stroke: The hot gases produced by the combustion of the fuel further increase the pressure in the cylinder, forcing the piston down • Exhaust stroke: exhaust valve opens when the piston is again near its lowest position, so that as the piston once more moves to its highest position, most of the burned gases are forced out of the cylinder. Four stroke Cycle Gasoline versus Diesel • Spark ignition: Gasoline engines use spark plugs to ignite fuel/ air mixture • Compression ignition : Diesel engines uses the heat of compressed air to ignite the fuel (intakes air, compresses it, then injects fuel) • Fuel injection :-Gasoline uses port fuel injection or carburetion;-Diesel uses direct fuel injection or pre combustion chambers (indirect injection) • Glow plugs :-electrically heated wire that helps heat pre combustion chambers fuel when the engine is cold- when a diesel engine is cold, compression may not raise air to temperature needed for fuel ignition Compression Ratio • Compression ratio: This is defined as the ratio of the volume of the cylinder at the beginning of the compression stroke (when the piston is at BDC) to the volume of the cylinder at the end of the compression stroke (when the piston is at TDC)....
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Introduction To Diesel Engine - Solar Energy International...

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