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首页> 外文期刊>Energy Conversion & Management >Performance and emission characteristics of LPG powered four stroke SI engine under variable stroke length and compression ratio
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Performance and emission characteristics of LPG powered four stroke SI engine under variable stroke length and compression ratio

机译：可变冲程长度和压缩比的LPG动力四冲程SI发动机的性能和排放特性

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A computer simulation of a variable stroke length, LPG fuelled, four stroke, single cylinder, water cooled spark ignition engine was done. The engine capacity was varied by varying the stroke length of the engine, which also changed its compression ratio. The simulation model developed was verified with experimental results from the literature for both constant and variable stroke engines. The performance of the engine was simulated at each stroke length/compression ratio combination. The simulation results clearly indicate the advantages and utility of variable stroke engines in fuel economy and power issues. Using the variable stroke technique has significantly improved the engine's performance and emission characteristics within the range studied. The brake torque and power have registered an increase of about 7-54% at low speed and 7-57% at high speed relative to the original engine design and for all stroke lengths and engine speeds studied. The brake specific fuel consumption has registered variations from a reduction of about 6% to an increase of about 3% at low speed and from a reduction of about 6% to an increase of about 8% at high speed relative to the original engine design and for all stroke lengths and engine speeds studied. On the other hand, an increase of pollutants of about 0.65-2% occurred at low speed. Larger stroke lengths resulted in a reduction of the pollutants level of about 1.5% at higher speeds. At lower stroke lengths, on the other hand, an increase of about 2% occurred. Larger stroke lengths resulted in increased exhaust temperature and, hence, make the exhaust valve work under high temperature.
机译：对可变行程长度，LPG燃料，四冲程，单缸，水冷式火花点火发动机进行了计算机仿真。通过改变发动机的冲程长度来改变发动机容量，这也改变了其压缩比。对于恒定冲程和可变冲程发动机，开发的仿真模型已得到文献的实验结果验证。在每种冲程长度/压缩比组合下模拟发动机的性能。仿真结果清楚地表明了可变冲程发动机在燃油经济性和功率问题上的优势和实用性。在研究范围内，使用可变冲程技术已显着改善了发动机的性能和排放特性。相对于原始发动机设计以及所研究的所有冲程长度和发动机转速，低速时的制动扭矩和功率增加了约7-54％，高速时的制动扭矩和功率增加了约7-57％。相对于原始发动机设计，制动器的特定燃油消耗在低速时从大约6％的减少变化到大约3％的增加，在高速时从大约6％的减少变化到大约8％的变化。适用于所有冲程长度和研究的发动机转速。另一方面，低速时污染物增加了约0.65-2％。较大的行程长度导致在较高速度下污染物水平降低了约1.5％。另一方面，在较短的冲程长度下，发生了大约2％的增加。较大的行程长度导致排气温度升高，因此使排气阀在高温下工作。

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