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A diesel spray penetration prediction method with variable fuel injection rate

A prediction method, diesel technology, used in engine testing, machine/structural component testing, measuring devices, etc.

Active Publication Date: 2022-08-02
HARBIN ENG UNIV
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Problems solved by technology

[0004] Since the high-pressure micro-injection has a typical triangular fuel injection rate curve, most of the existing classical phenomenological spray models are only suitable for spray penetration prediction under the condition of constant fuel injection rate (rectangular fuel injection rate curve)

Method used

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  • A diesel spray penetration prediction method with variable fuel injection rate
  • A diesel spray penetration prediction method with variable fuel injection rate
  • A diesel spray penetration prediction method with variable fuel injection rate

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Embodiment Construction

[0024] The present invention will be described in more detail below in conjunction with the accompanying drawings:

[0025] combine Figure 1-8 , Most of the existing diesel phenomenological spray models are only suitable for the calculation under the condition of constant fuel injection rate. For the prediction of spray characteristic parameters under the condition of variable fuel injection rate, the applicant proposed the concept of effective injection speed, which will effectively The injection velocity is related to the injection speed, and the spray penetration distance is related to the effective injection speed. The analytical formula for quantitatively calculating the effective injection speed and the penetration distance is derived, and a new phenomenology suitable for the prediction of the penetration distance with variable injection rate is proposed. The calculation method is used to establish a new spray model and apply it to the prediction of penetration distance...

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Abstract

The purpose of the present invention is to provide a variable fuel injection rate diesel spray penetration distance prediction method, which is suitable for variable fuel injection rate diesel spray penetration distance prediction, and belongs to a phenomenological modeling method. The method mainly includes: based on the theory of jet mechanics, establishing an analytical formula for the change of the effective injection velocity with the injection velocity, introducing the effective injection velocity instead of the injection velocity into the spray model suitable for the calculation of the constant injection rate, and obtaining a suitable injection rate for variable injection. The rate of spray model is used for the prediction of penetration distance. The spray model established by the present invention has a reliable theoretical basis, and the modeling method used has strong property description ability, the model is simple, the parameterized research is easy, and the spray penetration distance prediction of variable fuel injection rate can be realized.

Description

technical field [0001] The invention relates to a diesel fuel spray method, specifically a diesel fuel spray prediction method. Background technique [0002] With the application of combustion strategies such as multiple injection and diesel micro-injection to ignite natural gas, diesel high-pressure micro-injection technology has gradually become a research hotspot in this field. High-pressure micro-injection technology is an important technical means to achieve high efficiency and low emissions in the future. Therefore, it is particularly important to study the mixing characteristics of engine in-cylinder spray under the condition of high-pressure micro-injection. [0003] Accurate and rapid prediction of diesel spray mixing characteristics is essential for understanding and quantifying the combustion process of diesel engines. The phenomenological spray model has the advantages of low research cost, short development time, and high experimental independence. Therefore, ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20F02M65/00G06F111/10
CPCF02M65/00
Inventor 刘龙贾伟男彭雁梅齐昊
Owner HARBIN ENG UNIV
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