Spray forming method for implementing combustion similarity of diesel engine

A diesel engine, similar technology, applied in the direction of fuel injection device, engine test, machine/structural component test, etc., can solve the problems of lack of theoretical demonstration process, no summary of spray design method, etc., to reduce cost and strong feasibility , high economical effect

Active Publication Date: 2018-07-17
SHANGHAI JIAO TONG UNIV
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  • Abstract
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Problems solved by technology

However, the spray characteristics determine the combustion characteristics. Although there are international literatures that try to achieve spray similarity by controll

Method used

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  • Spray forming method for implementing combustion similarity of diesel engine
  • Spray forming method for implementing combustion similarity of diesel engine
  • Spray forming method for implementing combustion similarity of diesel engine

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Embodiment approach

[0089] Embodiment: The spray forming method for realizing diesel engine combustion similarity provided by the present invention can be specifically realized by three special methods in the following table:

[0090]

[0091]

[0092] In the table: ρ a,L is the ambient gas density of the combustion chamber 3 corresponding to the large-aperture fuel injector;

[0093] ρ a,S is the ambient gas density of the small-aperture fuel injector corresponding to the combustion chamber 4 .

[0094] Among them, the proportion value in method 1 is special when the fuel injection duration of the large-aperture injector 1 and the small-aperture injector 2 are the same; The flame floating length of injector 2 is the same; the proportion value in method 3 is special because the injection pressure of the large-aperture injector 1 and the small-aperture injector 2 are the same.

[0095] Taking two single-hole Delphi injectors with 0.14mm and 0.1mm apertures as an example, the injection pre...

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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...

Claims

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Application Information

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IPC IPC(8): F02M61/18F02M61/10F02M65/00
CPCF02M61/10F02M61/18F02M61/1806F02M61/1846F02M65/00
Inventor 李铁赖哲渊周昕毅王斌
Owner SHANGHAI JIAO TONG UNIV
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