LN2V22渦流室式柴油機性能提升
發(fā)布時間：2018-10-23 07:12
【摘要】：渦流室式柴油機工作性能優(yōu)良、排放量低、制造成本低廉,在我國農(nóng)業(yè)機械、交通運輸、工業(yè)等領(lǐng)域獲得了快速的發(fā)展和廣泛的應(yīng)用。渦流室式柴油機主要用于汽車、農(nóng)用水泵、拖拉機、收割機、小型工程機械、小型船舶等的動力組件。盡管面臨著直噴式柴油機和火花點燃式發(fā)動機的激烈競爭,但通過不斷的進步,它仍具有很強生命力,尤其在小型、高速、自然吸氣式發(fā)動機領(lǐng)域內(nèi)。由于渦流室式柴油機具有低排放、低噪聲、高速適應(yīng)性好等特點,近年來,國內(nèi)對發(fā)動機排放標準更加嚴格,所以渦流室式柴油機越來越受到了小型農(nóng)用機械的廣泛青睞。因此本文對渦流室式柴油機性能的研究,不僅具有一定的學術(shù)意義還具有實用價值。本課題是在與企業(yè)合作開發(fā)的基礎(chǔ)上進行的。以LN2V22渦流室式柴油機為研究樣機,以提高動力性和經(jīng)濟性為目標,研究分析渦流室式柴油機性能及結(jié)構(gòu)改進方法。課題首先對原機性能進行摸底分析,研究結(jié)果表明:原機進氣量嚴重不足,燃油消耗率過高,缸內(nèi)壓升率高導(dǎo)致工作粗暴,動力性不足,功率無法達到設(shè)計要求等問題。通過分析發(fā)現(xiàn),原機氣道設(shè)計不合理是導(dǎo)致進氣量不足的原因。與廠家商定后對原機進、排氣道進行優(yōu)化處理,但通過試驗發(fā)現(xiàn),優(yōu)化進、排氣道后,柴油機性能有所改善,但其動力性和經(jīng)濟性仍無法達到設(shè)計要求,故在更改氣道的基礎(chǔ)上對配氣機構(gòu)進行重新設(shè)計,優(yōu)化配氣凸輪型線,并在裝有新凸輪軸的發(fā)動機上進行燃油供給系統(tǒng)的匹配試驗,進一步提高該柴油機性能,最終滿足設(shè)計要求。對LN2V22柴油機原機及優(yōu)化后發(fā)動機進行性能試驗,試驗結(jié)果表明,原機標定功率為13.8k W,燃油消耗率為366.8g/(k W·h),最高壓升率1.49MPa/°CA;優(yōu)化氣道后發(fā)動機最大功率上升到15.1k W,燃油消耗率下降至320.0g/(k W·h),最高壓升率降為0.74MPa/°CA;通過對配氣凸輪軸型線的優(yōu)化,最終柴油機標定功率達到15.8k W,燃油消耗率下降到294.0g/(k W·h),最高壓升率0.52MPa/°CA。研究結(jié)果表明進氣量不足及燃油供給系統(tǒng)與柴油機不匹配是造成LN2V22渦流室式柴油機性能差的主要原因,本文的研究可作為該類渦流室式柴油機性能優(yōu)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/ 擄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/ 擄CA;. By optimizing the valve camshaft profile, the fuel consumption rate is reduced to 0.74MPa/ 擄CA;. In the end, the calibration power of diesel engine reached 15.8kW, and the fuel consumption rate decreased to 0.52MPa/ 擄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.
【學位授予單位】：河南科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TK421
本文編號：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/ 擄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/ 擄CA;. By optimizing the valve camshaft profile, the fuel consumption rate is reduced to 0.74MPa/ 擄CA;. In the end, the calibration power of diesel engine reached 15.8kW, and the fuel consumption rate decreased to 0.52MPa/ 擄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.
【學位授予單位】：河南科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TK421
【參考文獻】
相關(guān)期刊論文 前2條
1 鄭飛,沈宏泉,胡章其;175F型臥式風冷柴油機的開發(fā)[J];拖拉機;1986年02期
2 倪向東;梅衛(wèi)江;;4115TA_1渦流室式柴油機燃燒室節(jié)能改造的試驗研究[J];拖拉機與農(nóng)用運輸車;2010年05期
相關(guān)博士學位論文 前1條
1 魏勝利;直噴式柴油機渦流室燃燒系統(tǒng)的研究[D];大連理工大學;2010年
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