By H. Zhao
Direct injection permits targeted keep watch over of the fuel/air mix in order that engines may be tuned for superior strength and gas financial system. This has to be balanced opposed to elevated apparatus expenditures and emissions, providing ongoing study demanding situations in bettering the know-how for advertisement purposes. this significant publication stories the technological know-how and know-how of alternative sorts of DI combustion engines and their fuels. 5 major sections offer an summary of the cutting-edge, overlaying gas DI engines; either light-duty and heavy-duty DI diesel engines; replacement fuels and aftertreatment units; and complex modeling and experimental concepts.
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Extra info for Advanced Direct Injection Combustion Engine Technologies and Development: Gasoline and Gas Engines, Volume 1
This is a major disadvantage in regard to spray-guided combustion systems, as it influences the position of the spray in relation to the spark plug. This concept is currently favoured by most developers and manufacturers for purely homogeneous gasoline direct injection and for stratified charging operations with wall-guided mixture preparation. Sharply defined injection jets are a characteristic of the multihole nozzle. , 2003). Stratified-charge combustion in DI gasoline engines 31 of configurations.
Rather, it spreads at varying speeds: the flame front accelerates in enriched zones of individual injection jets, but slows down in lean zones between the injection jets. The number of injector holes therefore significantly influences the operating characteristics of the engine. A hole pattern that results in effective fuel distribution and constant flame spread between the various injection jets produces the best engine operating characteristics. The lean-burn capability of the engine can be improved by increasing the number of nozzle holes and also by reducing the individual flow areas.
Low combustion temperatures during partial load operation and when idling can lead to coking at the spark plug and, as a consequence, misfiring. ∑ Thermal shock at the spark plug. If liquid fuel comes into contact with the hot spark plug, it cools the spark plug rapidly, therefore subjecting it to an extremely high thermal load. ∑ Effect of fuel injection time. As fuel injection and ignition are closely linked, fuel is injected at a thermodynamically favourable time shortly 28 Advanced direct injection CET and development before ignition at top dead centre (TDC).
Advanced Direct Injection Combustion Engine Technologies and Development: Gasoline and Gas Engines, Volume 1 by H. Zhao