YC4S柴油机热力学仿真分析与试验
发布时间：2019-01-26 14:04
【摘要】：随着柴油机行业的飞速发展,传统的研发流程由于缺少复杂而科学的理论计算依据导致废品率高、试验成本高、研发周期长的弊端,已经无法满足现代柴油机研制及市场更新换代的需求,利用现代CAE仿真技术在发动机图纸阶段对发动机性能进行预测,通过优选方案减少发动机在试验阶段的方案数量显得尤为重要。本文以玉柴新开发的YC4S柴油机作为研究对象,在发动机设计阶段对发动机的动力性、经济性进行了预测。本文主要内容包括:(1)对国内外柴油机研发流程的现状和发展趋势进行了综合概述,同时还还阐述了YC4S柴油机的研发背景。这些都为YC4S柴油机在研发过程中采用CAE技术提供了必要依据。(2)柴油机的动力性、经济性以及排放性是发动机最重要的特性,在图纸设计阶段对它们的预测显得尤为重要。本文采用了Vibe燃烧放热模型和“Woschni1978”放热模型对YC4S柴油机的动力性、经济性和排放性能进行预测。通过研究表明:发动机采用18:1的压缩比,将原增压器基础上将涡轮增大70%,同时将排气门开启角增大10deg CRA、气门重叠角减小10deg CRA,能获得较好的综合性能,标定转速时平均要小压力提高了0.37bar,功率提高了4.3k W,最低比油耗降低了3g/(k W/h)。(3)选取不同的增压器做台架试验,检验计算机仿真分析的准确性,从而确认计算机仿真分析对柴油机研发过程具有准确的指导意义。试验表明,001增压器压端:C246(56)55Trim,0.56A/R,涡端:T232(50)74Trim,0.40A/R参数比较合理,可以得到更好的动力性和经济性。
[Abstract]:With the rapid development of diesel engine industry, the traditional research and development process, due to the lack of complex and scientific theoretical basis of calculation, led to high scrap rate, high test cost, long research and development cycle. It has been unable to meet the needs of modern diesel engine development and market renewal. The engine performance is predicted by modern CAE simulation technology in engine drawing stage. It is very important to reduce the number of engine schemes in the test stage by optimal selection scheme. In this paper, the new YC4S diesel engine developed by Yuchai is taken as the research object, and the engine power and economy are predicted in the engine design stage. The main contents of this paper are as follows: (1) the present situation and development trend of diesel engine R & D process at home and abroad are summarized, and the background of YC4S diesel engine R & D is also expounded. All these provide the necessary basis for the YC4S diesel engine to adopt CAE technology in the research and development process. (2) the engine's power performance, economy and emission are the most important characteristics of the engine, so it is very important to predict them in the drawing design stage. In this paper, Vibe combustion heat release model and "Woschni1978" heat release model are used to predict the power performance, economy and emission performance of YC4S diesel engine. The research shows that the engine can increase the turbine by 70% on the basis of the original turbocharger and increase the opening angle of the exhaust valve by increasing the 10deg CRA, valve overlap angle and reducing the 10deg CRA, by using the compression ratio of 18:1, and the better comprehensive performance can be obtained by increasing the opening angle of the exhaust valve and reducing the overlap angle of the 10deg CRA, valve. At the calibrated speed, the average pressure is increased by 0.37 bar. the power is increased by 4.3kW, and the lowest specific fuel consumption is reduced by 3g/ (k W / h). (3). The accuracy of computer simulation analysis is verified by selecting different turbochargers. It is confirmed that computer simulation analysis has an accurate guiding significance for diesel engine R & D process. The test results show that the pressure end of 001 turbocharger is C246 (56) 55 Trimton 0.56A / R, and the vortex end is T232 (50) 74Trimn 0.40A / R, the parameters are reasonable, and better power performance and economy can be obtained.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TK421
本文编号：2415563
[Abstract]:With the rapid development of diesel engine industry, the traditional research and development process, due to the lack of complex and scientific theoretical basis of calculation, led to high scrap rate, high test cost, long research and development cycle. It has been unable to meet the needs of modern diesel engine development and market renewal. The engine performance is predicted by modern CAE simulation technology in engine drawing stage. It is very important to reduce the number of engine schemes in the test stage by optimal selection scheme. In this paper, the new YC4S diesel engine developed by Yuchai is taken as the research object, and the engine power and economy are predicted in the engine design stage. The main contents of this paper are as follows: (1) the present situation and development trend of diesel engine R & D process at home and abroad are summarized, and the background of YC4S diesel engine R & D is also expounded. All these provide the necessary basis for the YC4S diesel engine to adopt CAE technology in the research and development process. (2) the engine's power performance, economy and emission are the most important characteristics of the engine, so it is very important to predict them in the drawing design stage. In this paper, Vibe combustion heat release model and "Woschni1978" heat release model are used to predict the power performance, economy and emission performance of YC4S diesel engine. The research shows that the engine can increase the turbine by 70% on the basis of the original turbocharger and increase the opening angle of the exhaust valve by increasing the 10deg CRA, valve overlap angle and reducing the 10deg CRA, by using the compression ratio of 18:1, and the better comprehensive performance can be obtained by increasing the opening angle of the exhaust valve and reducing the overlap angle of the 10deg CRA, valve. At the calibrated speed, the average pressure is increased by 0.37 bar. the power is increased by 4.3kW, and the lowest specific fuel consumption is reduced by 3g/ (k W / h). (3). The accuracy of computer simulation analysis is verified by selecting different turbochargers. It is confirmed that computer simulation analysis has an accurate guiding significance for diesel engine R & D process. The test results show that the pressure end of 001 turbocharger is C246 (56) 55 Trimton 0.56A / R, and the vortex end is T232 (50) 74Trimn 0.40A / R, the parameters are reasonable, and better power performance and economy can be obtained.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TK421
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1 原新涛;YC4S柴油机热力学仿真分析与试验[D];湖南大学;2016年
，本文编号：2415563
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