A Combustion Chamber Realizing Accelerated Flame Propagation and Suppression of Knocking

Abstract

The invention discloses a combustion chamber capable of realizing flame accelerated propagation to restrain knocking. The combustion chamber comprises an air cylinder wall, a piston, an air exhaust door and an air exhaust valve, wherein at least two hole plates are arranged on the top of the combustion chamber; through holes are uniformly distributed in each hole plate; the combustion chamber is connected with a pre-combustion chamber through the hole plates; the pre-combustion chamber is connected with an oil sprayer; after fuels are sprayed into the oil sprayer, combustible mixed gas in thepre-combustion chamber is ignited; after being accelerated by the hole plates, flame forms turbulent flame, so that flame is propagated to the tail-end area before tail-end gas in the combustion chamber is spontaneously combusted, and therefore, inhibition on knocking is realized. The combustion chamber mainly solves the knocking inhibition and post-combustion problem of a large-cylinder-diameterlow-speed dual-fuel engine for a ship; a little diesel oil is sprayed into the pre-combustion chamber to ignite natural gas, and flame generated by natural gas combustion is accelerated by the hole plates, and is propagated to a primary combustion chamber, so that high-speed turbulent flame is formed; and knocking and post-combustion of the primary combustion chamber are effectively inhibited, andload of the engine is effectively improved.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to the flame propagation between the main combustion chamber and the pre-combustion chamber of a large-bore low-speed internal combustion engine. The effect, specifically, is a combustor that realizes accelerated flame propagation and suppresses detonation. Background technique [0002] With the development of marine engines, people pay more and more attention to emission pollution, and the emission limit value is also gradually strengthened. IMO (International Maritime Organization United Nations International Maritime Organization), EU, USA and other regions have formulated corresponding standards to control the discharge of ships. According to the new requirements of the IMO emission regulations, the Tier II phase, the NOx emission limit will be reduced by 2.5g / kWh from 2011 compared to 2010; the Tier III phase, from 2016, the NOx will be reduced by 80% on th...

AI Technical Summary

Problems solved by technology

A small change in the structure of the pre-chamber may lead to a large difference in combustion performance. A suitable pre-chamber structure can realize rapid combustion of natural gas; otherwise, serious afterburning and excessive exhaust temperature will occur, and the thermal efficiency will decrease.

[0005] At present, most of the pre-combustion chamber and the main combustion chamber channel at home and abroad adopt multiple equal-angle uniformly distributed circular tube designs, which can achieve a certain flame acceleration. Multiple channels are used to connect between them, the structure is complex and the flame acceleration effect is limited

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