Combustion system of scattered space type direct injection diesel engine

Abstract

The invention discloses a combustion system of a scattered space type direct injection diesel engine and a combustion method, which belongs to the field of the formation and combustion of internal combustion engine gas mixture. The combustion system is characterized by comprising a gas inlet channel, a fuel injector and a combustion chamber, wherein the combustion chamber is a necking w-shaped combustion chamber, the specific degree of necking is that the included angle between the tangential direction along the side wall surface of the combustion chamber and the centre line of the conical body of the combustion chamber is 0 to 30 degrees, the bottom of the combustion chamber is provided with a large convex plate for generating strong extrusion flow; guiding convex arcs and small steps are circumferentially arranged on the side wall of the combustion chamber; and the upper edge of the fuel pocket sprayed out on the wall surface impact area is above the guiding convex arc, the lower edge is under the guiding convex arc and above the small step, and the fuel pocket is divided into an upper pat and a lower part after being reflected by the guiding convex arc and the small step. The combustion system has the advantages of low burst pressure, rapid mixing, long ignition delay period and low temperature combustion, can obtain best performance on the diesel engine and realize low-temperature premixed combustion, and simultaneously reduces the NOx concentration of the diesel engine and the emission of particulates.

Description

technical field [0001] The invention relates to a combustion system and a combustion mode of a spatially dispersed direct-injection diesel engine, which belongs to the field of formation and combustion of mixed gas in internal combustion engines. Background technique [0002] In a conventional diesel engine, the jet of oil slowly draws in the surrounding air, and because of the short ignition delay period, the fuel begins to burn before it is fully mixed with the air. Therefore, the concentration of fuel in the center of the oil beam is high, producing soot, while a stoichiometric mixture is formed in the outer area of ​​the oil beam, resulting in exhaust gas with high NOx concentration. [0003] During fuel injection, there is a large amount of soot in the core of the fuel jet near the flame front. During the fuel injection process, the fuel will continuously enter the rich mixture area. The interaction between liquid fuel or a very rich air-fuel ratio mixture and the flam...

AI Technical Summary

Problems solved by technology

However, there are still many problems to be solved in the engine using HCCI

For example, compared with conventional diesel engines, the working area is smaller, HC and CO emissions are high, premature injection at high loads causes rough work, fuel spray adheres to the cylinder liner wall and dilutes engine oil, etc.

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