Diesel spray combustion simulation method based on multi-component decoupling physical and chemical substitutes

A technology of spray combustion and physical chemistry, which is applied to combustion engines, teaching models, internal combustion piston engines, etc., can solve the problems that the actual diesel spray and combustion characteristics cannot be well reproduced at the same time

Active Publication Date: 2021-06-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diesel substitutes currently commonly used in simulation are single-component substitutes such as n-heptane and n-dodecane. Although the spray form is similar to that of actual diesel, the penetration distance of the spray gas-liquid phase and the ignition delay period are still the same as those of actual diesel. There is a certain gap, and the spray and combustion characteristics of actual diesel cannot be well reproduced at the same time

Method used

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  • Diesel spray combustion simulation method based on multi-component decoupling physical and chemical substitutes
  • Diesel spray combustion simulation method based on multi-component decoupling physical and chemical substitutes
  • Diesel spray combustion simulation method based on multi-component decoupling physical and chemical substitutes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The mass fractions of n-hexadecane, isooctane, decahydronaphthalene, and 1-methylnaphthalene were selected to be 42%, 8%, 23%, and 27%, respectively.

[0047] The simulation and experiment were carried out under the same environmental conditions and injection conditions. The ambient temperature was 850K / 900K, the ambient pressure was 4MPa, the injection pressure was 40Mpa, and the diameter of the nozzle hole was 0.32mm. The experiment was carried out in a visual constant volume incendiary bomb.

[0048] In the simulation, the KH-RT model is selected as the spray breakage model, the Frossling model is selected as the evaporation model, the NTC model is selected as the collision model, and the RNG k-ε model is selected as the turbulence model.

[0049]In the simulation, the basic grid is selected as 2mm, and 3-level local encryption is set near the nozzle, and 3-level adaptive encryption is performed on the speed and temperature, and the minimum grid size is 0.25mm.

[00...

Embodiment 2

[0052] The mass fractions of n-hexadecane, isooctane, decahydronaphthalene, and 1-methylnaphthalene were selected to be 40%, 12%, 21%, and 27%, respectively.

[0053] The rest of the simulation parameters are the same as those in Embodiment 1.

[0054] Comparing the gas-liquid phase penetration distance of the free jet spray at an ambient temperature of 850K between the simulation and the experiment, the two are in good agreement. Under the condition of ambient temperature of 900K, the experimental flame delay period is 1.50ms, and the axial ignition position is 50mm; the simulation result shows a flame delay period of 1.62ms, which has an error of 8% from the experimental result, and the simulated axial ignition position is 58mm , which is larger than the experimental results.

Embodiment 3

[0056] The mass fractions of n-hexadecane, isooctane, decahydronaphthalene, and 1-methylnaphthalene were selected as 44%, 12%, 17%, and 27%, respectively.

[0057] The rest of the simulation parameters are the same as those in Embodiment 1.

[0058] Comparing the gas-liquid phase penetration distance of the free jet spray at an ambient temperature of 850K between the simulation and the experiment, the two are in good agreement. Under the condition of ambient temperature of 900K, the experimental ignition delay period is 1.50ms, and the axial ignition position is 50mm; the ignition delay period obtained from the simulation results is 1.50ms, which is completely consistent with the experimental results, and the simulation axial ignition position is 53mm, which is higher than the experimental results. The result is too large.

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Abstract

The invention discloses a diesel oil spray combustion simulation method based on multi-component decoupling physical and chemical substitutes. The method is used for simulating spray combustion characteristics of -50 # diesel oil in alpine regions. The method comprises the following steps: selecting a physical substitute to characterize the physical characteristics of the -50 # diesel oil, and selecting a chemical substitute to characterize the chemical characteristics of the -50 # diesel oil; when diesel oil is in a liquid state during diesel oil spray combustion simulation, selecting the physical substitute as a diesel oil substitute; and when the diesel oil is evaporated from a liquid state to a gaseous state, selecting the chemical substitute as a diesel oil substitute to replace the physical substitute. According to the invention, spraying and combustion characteristics of actual diesel oil can be well reproduced at the same time.

Description

technical field [0001] The invention relates to the technical field of diesel spray combustion simulation, in particular to a -50# diesel spray combustion simulation method for vehicles in alpine regions. Background technique [0002] Vehicle engines in alpine regions are prone to misfire and intermittent fire during cold start, and even if they catch fire, they tend to burn violently, especially in winter, which seriously affects the performance of the vehicle. Among them, the use of -50# diesel has the greatest tendency to misfire and rough combustion, which is closely related to the physical and chemical properties of the fuel. [0003] Since it is difficult to directly observe the microscopic evolution process of in-cylinder ignition in experiments, simulation methods are usually used in research to explore the microscopic mechanism of misfire and rough combustion during cold start. The diesel substitutes currently commonly used in simulation are single-component substi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09B25/00
CPCG09B25/00Y02T10/40
Inventor 吴晗曹伟仁石智成薄亚卿曹智焜李向荣
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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