级间中冷作用及关键参数对二级增压系统的影响研究

发布时间：2018-01-03 12:26

本文关键词：级间中冷作用及关键参数对二级增压系统的影响研究　出处：《中北大学》2016年硕士论文　论文类型：学位论文

【摘要】：日益严重的汽车排放问题与环境之间的矛盾在世人的注目之下不断升温,近乎成为了全世界讨论的热点问题。伴随着对发动机性能的追求不断提升,发动机废气涡轮增压技术从根本上得到了进一步的改进和开发利用,废气涡轮增压技术不单单提升了发动机自身的性能指标,更重要的是降低了发动机尾气的排放,呼应了世界“节能、减排”的主题。二级增压系统相比单级增压系统,在发动机动力性和经济性方面有很大的改观,但级间中冷作用及系统总压在高、低压级之间的分配问题对二级增压系统的影响值得去深入研究和探讨。本文采用理论分析的方式探究了二级增压系统的关键参数总压比在两级之间的分配规则、膨胀比在两级之间的分配规则,压比分配对二级增压系统总效率的影响;通过发动机一维仿真模拟软件GT-Power建立独立的带有级间中冷作用的二级增压系统,结合试验值和经验值,设定了高压级涡轮的入口条件、入口参数、低压级压气机的入口参数,并设置多组不同的工况,通过仿真模拟计算的结果,分析探究级间中冷器产生的压降值对二级增压系统关键参数的影响;级间中冷器的温度对二级增压系统关键参数的影响。结果表明:级间中冷器产生的压降对二级增压系统的总压比有直接的影响,中冷器的压降和高压级压气机的入口压力固定时,系统的总压比与高压级压气机的入口温度有关;高压级压气机未进入失速工况前,随着中冷器压降的递增,高压级压气机的效率有最大值;控制系统的总压比固定不变,中冷器出口温度越高,产生的压降越大;控制级间中冷器的出口温度固定不变,二级增压系统的总压比随高压级压气机入口压力的递增而递增;级间中冷器的温度对二级增压系统低压级压气机的效率没有直接影响。以上结论为带有级间中冷作用的二级增压系统的进一步开发奠定了有力的理论基础。
[Abstract]:The increasingly serious problem of automobile emission and the contradiction between the environment and the world are heating up under the attention of the world, which has become a hot issue in the world, and with the pursuit of engine performance continues to improve. Engine exhaust turbocharging technology has been further improved and developed fundamentally. Exhaust gas turbocharging technology not only improves the performance of the engine itself. More important is to reduce engine exhaust emissions, echoing the world's "energy saving, emission reduction" theme. Compared with single-stage supercharging system, the two-stage supercharging system has a great improvement in engine power and economy. But the interstage intercooling and the total pressure of the system are high. The effect of the distribution problem between the low voltage stages on the two-stage supercharging system is worthy of further study and discussion. In this paper, the distribution rules of the key parameters of the two-stage supercharging system between the two stages are discussed by theoretical analysis. The distribution rule of expansion ratio between two stages and the effect of pressure score on the total efficiency of two-stage booster system; An independent two-stage turbocharging system with interstage intercooling effect was established by one-dimensional engine simulation software GT-Power. The inlet conditions of high-pressure stage turbine were set up by combining the experimental and empirical values. The inlet parameters, the inlet parameters of the low pressure stage compressor, and the different working conditions are set up. The effect of the pressure drop produced by the interstage intercooler on the key parameters of the two-stage supercharging system is analyzed through the results of simulation and calculation. The effect of the temperature of the interstage intercooler on the key parameters of the two-stage booster system. The results show that the pressure drop produced by the interstage intercooler has a direct effect on the total pressure ratio of the two-stage booster system. When the pressure drop of the intercooler and the inlet pressure of the high pressure stage compressor are fixed, the total pressure ratio of the system is related to the inlet temperature of the high pressure stage compressor. Before entering stall condition, the efficiency of high pressure stage compressor has the maximum value with the increasing of the pressure drop of the intercooler. The total pressure ratio of the control system is fixed, the higher the outlet temperature of the intercooler is, the greater the pressure drop will be. The outlet temperature of the control stage intercooler is fixed and the total pressure ratio of the two-stage booster system increases with the increase of the inlet pressure of the high-pressure stage compressor. The temperature of the interstage intercooler has no direct effect on the efficiency of the low-pressure stage compressor of the two-stage supercharging system. The above conclusion lays a strong theoretical foundation for the further development of the two-stage supercharging system with interstage intercooling.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U464.135

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