船用低速双燃料发动机预燃室引燃火焰的模拟研究  

Simulation of Pilot Flame in Pre-Combustion Chamber of A Low-SpeedDual-Fuel Marine Engine

作　　者：刘龙[1] 吴錾 谭富升 王洋[1] LIU Long;WU Zan;TAN Fusheng;WANG Yang(College of Power and Energy Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学动力与能源工程学院,哈尔滨150001

出　　处：《内燃机工程》2023年第2期34-42,50,共10页Chinese Internal Combustion Engine Engineering

基　　金：黑龙江省杰出青年基金项目(JQ2020E005)。

摘　　要：以RT-flex50DF船用低速二冲程双燃料发动机为研究对象,通过对模型的仿真计算分析了引燃火焰的流速及火焰面积在燃烧过程中的影响,总结了该低压喷射双燃料发动机引燃火焰的特点及燃烧过程。通过对比预燃室通道直径的方案发现,增大通道直径可以增加缸内的着火面积,加速燃料燃烧;减小通道直径可以达到增强缸内涡流的效果,提高火焰传播速度,但通道直径过大或过小都会对缸内燃烧产生不利影响。预燃室出口结构的方案通过保持出口截面积不变而增大火焰射流的表面积来加快缸内燃烧,避免孔径对缸内的湍流等参数产生影响,结果表明在该方案中合适的小孔尺寸可以提高缸内放热率的峰值,并缩短燃烧持续时间。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.

关 键 词：天然气 双燃料 低压直喷 预燃室 引燃火焰 

分 类 号：TK432[动力工程及工程热物理—动力机械及工程]