农业装备与车辆工程
農業裝備與車輛工程
농업장비여차량공정
Agricultural Equipment & Vehicle Engineering
2015年
9期
13-16
,共4页
天然气发动机%米勒循环%燃烧温度%排放量
天然氣髮動機%米勒循環%燃燒溫度%排放量
천연기발동궤%미륵순배%연소온도%배방량
CNG engine%miller cycle%maximum combustion temperature%emission
用GT-Power建立了某200型天然气发动机工作过程的仿真模型，计算结果表明，仅采用不同的气门升程曲线以获得的不同强度的米勒循环并不能实现米勒循环的各项优点，会导致功率、扭矩、充量系数的严重降低及有效燃气消耗率的升高。采用重新标定的米勒循环后，发动机的最大爆发压力最多可降低5.13 bar，最高燃烧温度可降低98 K，NOx的排放量为最大值的52.5%。
用GT-Power建立瞭某200型天然氣髮動機工作過程的倣真模型，計算結果錶明，僅採用不同的氣門升程麯線以穫得的不同彊度的米勒循環併不能實現米勒循環的各項優點，會導緻功率、扭矩、充量繫數的嚴重降低及有效燃氣消耗率的升高。採用重新標定的米勒循環後，髮動機的最大爆髮壓力最多可降低5.13 bar，最高燃燒溫度可降低98 K，NOx的排放量為最大值的52.5%。
용GT-Power건립료모200형천연기발동궤공작과정적방진모형，계산결과표명，부채용불동적기문승정곡선이획득적불동강도적미륵순배병불능실현미륵순배적각항우점，회도치공솔、뉴구、충량계수적엄중강저급유효연기소모솔적승고。채용중신표정적미륵순배후，발동궤적최대폭발압력최다가강저5.13 bar，최고연소온도가강저98 K，NOx적배방량위최대치적52.5%。
The numerical simulation model of the working process for 200 CNG engine was built based on GT-Power software. Calculation results indicated that: Miller cycles of different strengths obtained by using different valve lift curves can ’t realize the expected advantages. On the contrary, the power output, torque as well as brake specific fuel consumption are markedly deteriorated owing to the reduced volumetric efficiency of intake charge. By adoption of the re-calibrated miller cycles with improved boost pressure, the peak in-cylinder pressure decreases by 5.13 bar, maximum combustion temperature decreases by 98K and emissions of NOx is reduced to 52.5%of the maximum value.
