CAJ | 학술논문

为考察汽油机燃烧过程中的能量转化规律,建立了汽油机燃烧过程的热力学双区模型,考虑了可用能变化及不可逆损失.求解了燃烧期间缸内压力及温度随曲轴转角的变化规律、缸内工质可用能及不可逆损失的变化规律,分析了未燃区和已燃区的可用能以及与放热规律的关系.工质可用能转化包括对外做功、传热转移可用能和可用能损失3部分,燃烧结束时,工质总可用能占燃烧初始总可用能的比例约为47.0%.在整个燃烧阶段,燃烧可用能损失约为18.4%,由于向缸壁传热造成的可用能损失约为12.3%.缩短燃烧持续期和适当推后着火有利于降低燃烧过程可用能不可逆损失.
위고찰기유궤연소과정중적능량전화규률,건립료기유궤연소과정적열역학쌍구모형,고필료가용능변화급불가역손실.구해료연소기간항내압력급온도수곡축전각적변화규률、항내공질가용능급불가역손실적변화규률,분석료미연구화이연구적가용능이급여방열규률적관계.공질가용능전화포괄대외주공、전열전이가용능화가용능손실3부분,연소결속시,공질총가용능점연소초시총가용능적비례약위47.0%.재정개연소계단,연소가용능손실약위18.4%,유우향항벽전열조성적가용능손실약위12.3%.축단연소지속기화괄당추후착화유리우강저연소과정가용능불가역손실.
To investigate the energy conversion principle in the combustion process of a gasoline engine,a two-zone thermodynamic model was developed. The change of availability and loss of irreversibility were taken into account. Cylinder pressure and temperature were calculated as a function of crank angle during the combustion process. Total availability and availability destruction terms were calculated as a function of crank angle. The relationship of availability of unburned zone and burned zone and its relationship with heat release were analyzed. Transfer of charge availability includes work,availability transfer of heat transfer and availability destruction. Charge availability at the end of combustion is about 47.0% of the total availability at the start of combustion. Combustion irreversibility is about 18.4% of the total intial availability,while due to heat transfer,availability destruction is about 12.3% during the whole combustion process. A shorter combustion duration and a properly postponed combustion are both helpful to reduce availability destruction.