1.National Key Laboratory of Automotive Chassis Integration and Bionics,Jilin University,Changchun 130022,China
2.GAC Automotive Research & Development Center,Guangzhou 511434,China
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文章历史+
Received
Published
2024-03-09
2025-09-01
Issue Date
2025-10-30
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摘要
采用试验研究方法在不同负荷和过量空气系数下研究了隔热活塞对汽油机性能的影响。结果表明:采用隔热涂层活塞,小负荷工况下最佳点火时刻提前,着火延迟期和燃烧持续期延长;相反,大负荷工况下,燃烧中心推迟。此外,采用隔热涂层活塞会导致NO x 排放量上升,CO和HC排放量下降;在大负荷空气稀释燃烧和当量比燃烧下,隔热涂层活塞对发动机性能影响相同。
Abstract
An experimental study was conducted to investigate the effects of an insulated piston on gasoline engine performance under different loads and excess air ratios. The results show that the optimal ignition time is advanced at low load, the ignition delay period and the combustion duration are prolonged;conversely, the combustion center is postponed at high load. Additionally the use of thermal insulation coating pistons has led to an increase in NO x emissions and a decrease in CO and HC emissions; the thermal insulation coating pistons has the same effect on engine performance during both and stoichiometric air dilution combustion at high loads combustion.
图8为当量比燃烧下汽油机采用普通活塞和隔热涂层活塞常规排放物对比。与普通活塞相比,隔热涂层活塞会导致NO x 排放量升高。当GIMEP为0.85 MPa时,NO x 排放量升高最为明显,此时隔热涂层活塞的NO x 排放量较普通活塞升高22.78%。高温NO x 是汽油机NO x 排放量主要来源,根据高温NO x 反应机理,生成NO x 的条件是温度、氧浓度和反应时间[22]。相较于普通活塞,隔热涂层活塞会减少燃烧过程中通过活塞顶的散热量,导致缸内温度维持在NO x 生成高温区的曲轴转角范围变长,使得NO x 排放升高。
图14为大负荷空气稀释燃烧下汽油机采用普通活塞和隔热涂层活塞常规排放物对比。在大负荷空气稀释燃烧下,相较于普通活塞,隔热涂层活塞会导致NO x 排放量升高、CO和THC排放量降低。以过量空气系数为1.3为例,隔热涂层活塞相较于普通活塞NO x 排放量升高了25.87%,CO排放量降低了5.56%,THC排放量降低了4.66%,这与大负荷当量比燃烧下得出的结论一致。
(4)当量比燃烧和大负荷空气稀释燃烧下,采用隔热涂层活塞均会使NO x 排放上升、CO和THC排放下降。当量比燃烧下,当GIMEP为0.85 MPa时,隔热涂层活塞相较于普通活塞NO x 排放升高22.78%,CO和THC排放分别降低62.12%和16.61%。大负荷空气稀释燃烧下,当过量空气系数为1.3时,隔热涂层活塞相较于普通活塞NO x 排放升高了25.87%,CO排放降低了5.56%,THC排放降低了4.66%。
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