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Diesel spray penetration distance 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: 2020-08-18
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)

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  • Diesel spray penetration distance prediction method with variable fuel injection rate
  • Diesel spray penetration distance prediction method with variable fuel injection rate
  • Diesel spray penetration distance prediction method with variable fuel injection rate

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Embodiment Construction

[0024] The present invention is described in more detail below in conjunction with accompanying drawing example:

[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 velocity, and will effectively The injection velocity is related to the injection velocity, and the spray penetration distance is related to the effective injection velocity. The analytical formula for quantitatively calculating the effective injection velocity and penetration distance is deduced, and a new phenomenology suitable for the prediction of the penetration distance with variable injection rate is proposed. Computational method, establishing a new spray model and applying it to penetration prediction. All the formula...

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Abstract

The invention aims to provide a diesel spray penetration distance prediction method with a variable fuel injection rate. The method is suitable for predicting the diesel spray penetration distance with the variable fuel injection rate, and belongs to an iconography modeling method. The method mainly comprises the following steps: based on the jet flow mechanics theory, an analytic expression of the change of the effective injection speed along with the injection speed is established, the effective injection speed replaces the injection speed and is introduced into a spray model suitable for constant oil injection rate calculation, and the spray model suitable for the variable oil injection rate is obtained and is used for prediction of the penetration distance. The established spray modelhas a reliable theoretical basis, the modeling method has high attribute description capability, the model is simple, parameterized research is easy, and the spray penetration distance of the variableoil injection rate can be predicted.

Description

technical field [0001] The invention relates to a diesel spray method, in particular to a diesel 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, so it is particularly important to study the spray mixing characteristics in the engine cylinder under high-pressure micro-injection conditions. [0003] Accurate and rapid prediction of diesel spray mixing characteristics is crucial for understanding and quantitatively analyzing the combustion process of diesel engines. The phenomenological spray model has the advantages of low research cost, short development time, and high independence from experiments. Therefore, it h...

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Application Information

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Patent Type & Authority Applications(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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