Engine combustion system with ignition chamber composite channel

Abstract

The invention discloses an engine combustion system with an ignition chamber composite channel. The engine system comprises a cylinder, a piston and a cylinder cover, wherein the cylinder cover is provided with an ignition chamber; an ignition device and a fuel supply device are arranged in the ignition chamber; the ignition chamber communicates with a main combustion chamber through a plurality of channels; at least one of the channels adopts a composite channel structure formed by converging and merging at least two sub-channels; the end separating the sub-channels in the composite channelfaces the ignition chamber; the end converging and combing the sub-channels in the composite channel faces the main combustion chamber; a flow distribution area of the composite channel is formed by the separated areas of the sub-channel; and a confluence area of the composite channel is formed by the converged areas of the sub-channels. The novel ignition chamber type engine combustion system isprovided for a large cylinder diameter engine, the turbulence disturbance of an ignition chamber jet flow to the main combustion chamber is improved, and the engine system is used for accelerating combustion of the main combustion chamber, thereby improving engine performance and emission.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engines, and in particular relates to an engine combustion system equipped with an ignition chamber composite channel. Background technique [0002] The use of lean burn is an important way to improve the thermal efficiency of ignition engines and reduce harmful emissions. However, there are two problems in the combustion of lean mixture: first, the leaner the mixture, the more difficult it is to ignite, so a high-energy ignition device is required; second, the leaner the mixture, the lower the flame propagation rate, which reduces the engine efficiency , and even lead to incomplete combustion, increasing unburned hydrocarbon emissions. Especially for an engine with a large bore, such as an engine with a bore greater than 150mm, the possibility of these abnormal combustion phenomena is greatly increased due to the longer required flame propagation distance. [0003] In order to solve...

AI Technical Summary

Problems solved by technology

However, there are two problems in the combustion of lean mixture: first, the leaner the mixture, the more difficult it is to ignite, so a high-energy ignition device is required; second, the leaner the mixture, the lower the flame propagation rate, which reduces the engine efficiency , even lead to incomplete combustion, increasing unburned hydrocarbon emissions

For example, it is difficult to balance ignition reliability and combustion rate. Specifically, if a larger channel diameter is used, the flame is easier to enter the main combustion chamber, the ignition energy is higher, and the ignition reliability is good, but the jet velocity is relatively slow. The turbulent disturbance in the main combustion chamber is relatively weak, which is not conducive to the rapid combustion of the lean mixture; and the smaller channel diameter can significantly improve the turbulent disturbance in the main combustion chamber, but the flame is easily quenched in the channel, and the ignition energy decreases. Affect the ignition reliability, and even the ignition failure of the main combustion chamber may occur

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