李敬瑞, 王解托, 刘海峰, 刘腾, 董晶瑾, 尧命发.天然气后喷对高压直喷天然气船机燃烧和排放的影响研究[J].内燃机工程,2020,41(6):1-10.
天然气后喷对高压直喷天然气船机燃烧和排放的影响研究
Influence of Natural Gas Post Injection Strategies on Combustion and Emissions of High Pressure Direct Injection Marine Natural Gas Engines
DOI：10.13949/j.cnki.nrjgc.2020.06.001
关键词:引燃喷射  高压直喷  天然气  碳烟  后喷
Key Words:pilot injection  high pressure direct injection  natural gas  soot  post injection
基金项目:船用低速机工程（一期）研制（工信部联装函[2017]21号）
作者单位
李敬瑞, 王解托, 刘海峰, 刘腾, 董晶瑾, 尧命发 1.天津大学 内燃机燃烧学国家重点实验室，天津 300072；2.中船动力研究院有限公司，上海 200120 
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摘要:利用流体动力学软件CONVERGE建立了高压直喷天然气船机的三维仿真模型，基于该模型研究了后喷策略对高压直喷天然气船机燃烧和排放的影响。结果表明：随后喷比例增大，最高燃烧压力略升高，燃烧持续期增长；随着喷射间隔的增大，最高燃烧压力不变，但后喷燃烧相位推迟，燃烧持续期增长。与无后喷算例相比，后喷比例增大到10%和20%时，碳烟排放分别降低了7.7%～13.5%和1.5%～11.5%，NOx排放分别升高了12.0%～15.0%和5.0%～7.0%，指示燃油消耗率分别增大了约0.1%和1.0%；而后喷比例为30%时，碳烟排放升高了2.0%～8.0%，NOx排放降低了5.0%～7.7%，指示燃油消耗率增大了约2.3%。
Abstract:Using a new generation of thermal fluid analysis software(CONVERGE), the three dimensional computational fluid dynamics(CFD) model for high pressure direct injection marine natural gas engines was developed to study the effect of natural gas post injection strategies on engine combustion and emissions. Results show that the rise in post injection ratio slightly increases the maximum combustion pressure coupled with the extension of combustion duration. Increasing the interval between the main injection and post injection would delay the post injection combustion phase, and extend the combustion duration, while the maximum combustion pressure remains unchanged. Compared with the operation without natural gas post injection, increasing the proportion of post injection to 10% and 20%, respectively can reduce soot emissions by 7.7%～13.5% and 1.5%～11.5% with an increase of NOx emissions by 12.0%～15.0% and 5.0%～7.0% and an increase of indicated specific fuel consumption by about 0.1% and 1.0%. However, increasing the proportion of post injection to 30% obtains a strong increase of soot emissions by 2.0%～8.0% with a reduction of NOx emissions by 5.0%～7.7% and an increase of indicated specific fuel consumption by approximately 2.3%.
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