Quantitative evaluation method for premixed combustion ratio of dual-fuel engine

By constructing an in-cylinder simulation model of the engine, extracting the flame-like volume and calculating the ignition time, the premixed combustion ratio of the dual-fuel engine is quantified, solving the problem of uneven combustion caused by asymmetric arrangement, and realizing accurate combustion mode evaluation and optimization.

CN122333016APending Publication Date: 2026-07-03TIANJIN UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN UNIV
Filing Date
2026-03-16
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In existing dual-fuel engines, the uneven flame distribution caused by the asymmetrical arrangement of zero-carbon fuel injectors and ignition injectors results in significant differences in the ignition timing of different fuel jets. Existing combustion characteristic parameters are difficult to accurately quantify the ratio of premixed combustion to diffusion combustion, resulting in large errors.

Method used

By constructing a simulation model of the engine cylinder working process, and based on the combustion calculation results of the simulation model, the "flame-like volume" change curve of each type of fuel jet is extracted to determine the ignition time. The mass of zero-carbon fuel injected into each type of fuel jet before the ignition time is calculated, and the ratio is summarized to quantify the premixed combustion ratio.

Benefits of technology

It enables precise quantitative evaluation of the premixed combustion ratio of dual-fuel engines, provides key data support, offers a new analytical dimension for optimizing engine combustion modes and reducing emissions, and has clear physical significance and computational stability.

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Abstract

This invention provides a quantitative evaluation method for the premixed combustion ratio of a dual-fuel engine, belonging to the field of internal combustion engine combustion analysis technology. The method includes: constructing a simulation model of the engine's in-cylinder working process; classifying zero-carbon fuel jets based on spatial symmetry; extracting the time-varying curve of the "flame-like volume" within the combustion region corresponding to each type of jet; determining the ignition time of each type of jet based on the curve; calculating the mass of zero-carbon fuel injected before ignition based on the ignition time and injection rate curve; and finally summarizing and calculating the proportion of premixed fuel mass to the total injection mass to obtain the premixed combustion ratio. This invention, employing the aforementioned quantitative evaluation method for the premixed combustion ratio of a dual-fuel engine, achieves for the first time an accurate and quantitative evaluation of the premixed combustion ratio under asymmetric ignition conditions. The evaluation results have clear physical meaning, providing crucial data support for optimizing the combustion mode and performance of dual-fuel engines.
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