LN2V22涡流室式柴油机性能提升
发布时间：2018-10-23 07:12
【摘要】：涡流室式柴油机工作性能优良、排放量低、制造成本低廉,在我国农业机械、交通运输、工业等领域获得了快速的发展和广泛的应用。涡流室式柴油机主要用于汽车、农用水泵、拖拉机、收割机、小型工程机械、小型船舶等的动力组件。尽管面临着直喷式柴油机和火花点燃式发动机的激烈竞争,但通过不断的进步,它仍具有很强生命力,尤其在小型、高速、自然吸气式发动机领域内。由于涡流室式柴油机具有低排放、低噪声、高速适应性好等特点,近年来,国内对发动机排放标准更加严格,所以涡流室式柴油机越来越受到了小型农用机械的广泛青睐。因此本文对涡流室式柴油机性能的研究,不仅具有一定的学术意义还具有实用价值。本课题是在与企业合作开发的基础上进行的。以LN2V22涡流室式柴油机为研究样机,以提高动力性和经济性为目标,研究分析涡流室式柴油机性能及结构改进方法。课题首先对原机性能进行摸底分析,研究结果表明:原机进气量严重不足,燃油消耗率过高,缸内压升率高导致工作粗暴,动力性不足,功率无法达到设计要求等问题。通过分析发现,原机气道设计不合理是导致进气量不足的原因。与厂家商定后对原机进、排气道进行优化处理,但通过试验发现,优化进、排气道后,柴油机性能有所改善,但其动力性和经济性仍无法达到设计要求,故在更改气道的基础上对配气机构进行重新设计,优化配气凸轮型线,并在装有新凸轮轴的发动机上进行燃油供给系统的匹配试验,进一步提高该柴油机性能,最终满足设计要求。对LN2V22柴油机原机及优化后发动机进行性能试验,试验结果表明,原机标定功率为13.8k W,燃油消耗率为366.8g/(k W·h),最高压升率1.49MPa/°CA;优化气道后发动机最大功率上升到15.1k W,燃油消耗率下降至320.0g/(k W·h),最高压升率降为0.74MPa/°CA;通过对配气凸轮轴型线的优化,最终柴油机标定功率达到15.8k W,燃油消耗率下降到294.0g/(k W·h),最高压升率0.52MPa/°CA。研究结果表明进气量不足及燃油供给系统与柴油机不匹配是造成LN2V22涡流室式柴油机性能差的主要原因,本文的研究可作为该类涡流室式柴油机性能优化提升的示例。
[Abstract]:The swirl chamber diesel engine has been developed rapidly and widely used in agricultural machinery, transportation, industry and other fields because of its excellent performance, low emission and low manufacturing cost. Swirl chamber diesel engine is mainly used for motor vehicles, agricultural pumps, tractors, harvesters, small construction machinery, small ships and other power components. Despite the fierce competition between direct injection diesel engines and spark ignition engines, it still has strong vitality through continuous progress, especially in the field of small, high speed, naturally aspirated engines. Since swirl chamber diesel engine has the characteristics of low emission, low noise, high speed adaptability and so on, in recent years, the engine emission standard is more and more strict in China, so swirl chamber diesel engine is more and more popular in small farm machinery. Therefore, the research on the performance of swirl chamber diesel engine is not only of academic significance but also of practical value. This subject is carried out on the basis of cooperation with enterprises. Taking the LN2V22 swirl chamber diesel engine as the research prototype, the performance and structure improvement methods of the swirl chamber diesel engine are studied and analyzed in order to improve the power performance and economy. The research results show that the air intake of the original engine is seriously insufficient, the fuel consumption rate is too high, the high in-cylinder pressure rise rate leads to rough work, insufficient power, and the power can not meet the design requirements. Through the analysis, it is found that the unreasonable design of the original air inlet is the cause of the insufficient air intake. After negotiation with the manufacturer, the original intake and exhaust channels were optimized. However, the performance of the diesel engine was improved after the optimization of the intake and exhaust channels, but its power performance and economy could not meet the design requirements. Therefore, on the basis of changing the port, the valve mechanism is redesigned, the valve cam profile is optimized, and the matching test of fuel supply system is carried out on the engine with new camshaft to further improve the performance of the diesel engine. Finally meet the design requirements. The performance tests of LN2V22 diesel engine and optimized engine are carried out. The experimental results show that, The calibration power of the original engine is 13.8 kW, the fuel consumption rate is the 366.8g/ (k W h), maximum high pressure lift rate 1.49MPa/ 掳CA;, the engine maximum power rises to 15.1kW after optimizing the port, and the fuel consumption rate decreases to the 320.0g/ (k W h), maximum high pressure rise rate to 0.74MPa/ 掳CA;. By optimizing the valve camshaft profile, the fuel consumption rate is reduced to 0.74MPa/ 掳CA;. In the end, the calibration power of diesel engine reached 15.8kW, and the fuel consumption rate decreased to 0.52MPa/ 掳CA., the most high pressure rise rate of 294.0g/ (k W h),. The results show that insufficient intake and mismatch between fuel supply system and diesel engine are the main reasons for the poor performance of LN2V22 swirl chamber diesel engine. The research in this paper can be used as an example of performance optimization and promotion of this kind of swirl chamber diesel engine.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK421
本文编号：2288453
[Abstract]:The swirl chamber diesel engine has been developed rapidly and widely used in agricultural machinery, transportation, industry and other fields because of its excellent performance, low emission and low manufacturing cost. Swirl chamber diesel engine is mainly used for motor vehicles, agricultural pumps, tractors, harvesters, small construction machinery, small ships and other power components. Despite the fierce competition between direct injection diesel engines and spark ignition engines, it still has strong vitality through continuous progress, especially in the field of small, high speed, naturally aspirated engines. Since swirl chamber diesel engine has the characteristics of low emission, low noise, high speed adaptability and so on, in recent years, the engine emission standard is more and more strict in China, so swirl chamber diesel engine is more and more popular in small farm machinery. Therefore, the research on the performance of swirl chamber diesel engine is not only of academic significance but also of practical value. This subject is carried out on the basis of cooperation with enterprises. Taking the LN2V22 swirl chamber diesel engine as the research prototype, the performance and structure improvement methods of the swirl chamber diesel engine are studied and analyzed in order to improve the power performance and economy. The research results show that the air intake of the original engine is seriously insufficient, the fuel consumption rate is too high, the high in-cylinder pressure rise rate leads to rough work, insufficient power, and the power can not meet the design requirements. Through the analysis, it is found that the unreasonable design of the original air inlet is the cause of the insufficient air intake. After negotiation with the manufacturer, the original intake and exhaust channels were optimized. However, the performance of the diesel engine was improved after the optimization of the intake and exhaust channels, but its power performance and economy could not meet the design requirements. Therefore, on the basis of changing the port, the valve mechanism is redesigned, the valve cam profile is optimized, and the matching test of fuel supply system is carried out on the engine with new camshaft to further improve the performance of the diesel engine. Finally meet the design requirements. The performance tests of LN2V22 diesel engine and optimized engine are carried out. The experimental results show that, The calibration power of the original engine is 13.8 kW, the fuel consumption rate is the 366.8g/ (k W h), maximum high pressure lift rate 1.49MPa/ 掳CA;, the engine maximum power rises to 15.1kW after optimizing the port, and the fuel consumption rate decreases to the 320.0g/ (k W h), maximum high pressure rise rate to 0.74MPa/ 掳CA;. By optimizing the valve camshaft profile, the fuel consumption rate is reduced to 0.74MPa/ 掳CA;. In the end, the calibration power of diesel engine reached 15.8kW, and the fuel consumption rate decreased to 0.52MPa/ 掳CA., the most high pressure rise rate of 294.0g/ (k W h),. The results show that insufficient intake and mismatch between fuel supply system and diesel engine are the main reasons for the poor performance of LN2V22 swirl chamber diesel engine. The research in this paper can be used as an example of performance optimization and promotion of this kind of swirl chamber diesel engine.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK421
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