Spray forming method for implementing combustion similarity of diesel engine

Abstract

The invention provides a spray forming method for implementing combustion similarity of a diesel engine. The method comprises the following step of establishing a small-bore oil atomizer (2) corresponding to a large-bore oil atomizer (3), wherein the small-bore oil atomizer (2) and the large-bore oil atomizer (1) have any one or more of the following relationships: the geometric structures are similar; the numbers of spray nozzles are same; the diameters of the spray nozzles are zoomed in proportion; the types of fuels are same; the environmental media are same; the oil injection pressures arezoomed in proportion; the oil injection lasting periods are zoomed in proportion; and the oil injection amounts are zoomed in proportion. The spray forming method for implementing combustion similarity of the diesel engine provided by the invention can achieve the atomizing combustion characteristic of representing corresponding test working conditions of other-bore oil atomizers by means of existing oil atomizers to establish a test database, so that the cost of a development process of an atomizing combustion system of the diesel engine is lowered favorably.

Description

technical field [0001] The invention relates to the field of diesel engine and similarity research, in particular to a spray forming method for realizing diesel engine combustion similarity. Background technique [0002] The development and optimization process of the diesel engine combustion system is of great significance to improve the fuel economy of diesel engines and reduce harmful emissions. In order to solve the problem that large diesel engines are bulky, costly, and difficult to conduct experiments directly, the combustion similarity theory derived based on mass, momentum, energy, and chemical composition conservation equations finds that the combustion performance of large diesel engines, such as temperature, cylinder pressure, Heat release rates, emissions, etc. can be mapped back by running experiments on geometrically similar small diesel engines. However, the spray characteristics determine the combustion characteristics. Although there are international lite...

AI Technical Summary

Problems solved by technology

However, the spray characteristics determine the combustion characteristics. Although there are international literatures that try to achieve spray similarity by controlling injection pressure, injection duration and other parameters, there is a lack of corresponding theoretical demonstration process and no summary of spray design methods.

Images