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| Simulation of Pilot Flame in Pre-Combustion Chamber of A Low-Speed Dual-Fuel Marine Engine |
| DOI：10.13949/j.cnki.nrjgc.2023.02.005 |
| Key Words:natural gas dual-fuel low-pressure direct injection pre-chamber pilot flame |
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| Abstract:Taking a RT-flex50DF low-speed dual-fuel marine engine as the research object to model and perform simulation calculations， the influence of the flow velocity of the pilot flame and the flame area in the combustion process was analyzed， and the characteristics of combustion process and the pilot flame of the low-pressure injection dual-fuel engine were summarized. By comparing the diameter of the pre-chamber channels， it was found that increasing the channel diameter can increase the ignition area in the cylinder and speed up burning. Reducing channel diameter can achieve the effect of enhancement of the vortex in the cylinder and the flame propagation speed. However， if the channel diameter is too large or too small， it will have an adverse effect on the combustion in the cylinder. The solution to modifying the outlet structure of the pre-combustion chamber can accelerate the combustion in the cylinder by keeping the cross-sectional area of the outlet unchanged and increasing the surface area of the flame jet， and reduce the influence of turbulence and other parameters in the cylinder due to the change of the aperture. Results show that the appropriate hole size in this scheme can increase the peak heat release rate in the cylinder and shorten the combustion duration. |
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