可变截面涡轮增压器与柴油机的匹配研究

发布时间：2018-07-20 10:36

【摘要】：涡轮增压技术是强化柴油机性能的一种有效方法,它能够有效提高柴油机的功率和扭矩。常规涡轮增压柴油机存在低速动力不足,燃油消耗较多的问题。研究表明,采用可变截面涡轮增压器能有效解决上述难题。本文主要研究可变截面涡轮增压器与柴油机的匹配问题。本文运用GT-POWER仿真软件建立了涡轮增压柴油机的仿真模型。通过比较仿真模型的计算结果与发动机的试验数据,发现仿真模型符合精度要求,能够为后续研究提供基础模型。本文运用GT-POWER仿真模型,研究了原机安装的HP50型废气旁通涡轮增压器与柴油机的匹配情况,发现该增压器存着在工作效率低,匹配较差的问题,需要重新进行匹配。本文选用了JK45和JK48两个型号的可变截面涡轮增压器,通过对比JK45和JK48两个型号的可变截面涡轮增压器与柴油机的联合运行曲线,发现JK48型可变截面涡轮增压器与柴油机的匹配效果更好。本文研究了可变喷嘴环开度变化对发动机性能的影响。运用GT-POWER仿真模型,调整可变喷嘴环开度在0~1之间,分析发动机的空气流量、扭矩、有效燃油消耗率随可变喷嘴环开度变化的规律。研究不同负荷时可变喷嘴环开度对发动机性能的影响。通过PID控制,获得最佳的可变喷嘴环开度。本文通过涡轮增压器与柴油机联合运行试验的方法,获得了原机安装的HP50型废气旁通涡轮增压器、JK48型可变截面涡轮增压器与柴油机联合运行的试验数据。通过比较两款涡轮增压柴油机的增压压力、空气流量、扭矩、功率、燃油消耗量、有效燃油消耗率的差异,发现安装了JK48型可变截面涡轮增压器的柴油机的动力性、经济性都优于安装了HP50型废气旁通涡轮增压器的柴油机。因此,JK48型可变截面涡轮增压器与柴油机的匹配效果更好。
[Abstract]:Turbocharging technology is an effective method to enhance diesel engine performance. It can effectively improve the power and torque of diesel engine. Conventional turbocharged diesel engine has the problem of low speed power shortage and more fuel consumption. The study shows that variable section turbocharger can effectively solve the above problem. In this paper, the matching problem between variable section turbocharger and diesel engine is studied. In this paper, the simulation model of turbocharged diesel engine is established by using GT-POWER simulation software. By comparing the calculation results of the simulation model with the experimental data of the engine, it is found that the simulation model meets the requirements of accuracy and can provide the basic model for further research. In this paper, the GT-POWER simulation model is used to study the matching between the HP50 exhaust gas bypass turbocharger and the diesel engine. It is found that the supercharger has the problems of low working efficiency and poor matching, so it needs to be rematched. In this paper, two types of variable section turbocharger, JK45 and JK48, are selected, and the joint operation curves of JK45 and JK48 are compared with the diesel engine. It is found that the matching effect of JK48 variable section turbocharger and diesel engine is better. The effect of variable nozzle ring opening on engine performance is studied in this paper. By using the GT-POWER simulation model, the variable nozzle ring opening is adjusted to 0 ~ 1, and the variation law of the engine air flow, torque and effective fuel consumption rate with the variable nozzle ring opening is analyzed. The effect of variable nozzle ring opening on engine performance at different loads was studied. Through pid control, the best variable nozzle ring opening is obtained. In this paper, by the method of combined operation of turbocharger and diesel engine, the test data of combined operation of HP50 exhaust gas by-pass turbocharger and diesel engine with variable section turbocharger JK48 are obtained. By comparing the difference of supercharged pressure, air flow, torque, power, fuel consumption and effective fuel consumption between two turbocharged diesel engines, it is found that the diesel engine installed with JK48 variable section turbocharger has dynamic performance. The economy is better than the diesel engine with HP50 exhaust gas bypass turbocharger. Therefore, the matching effect of JK 48 variable cross section turbocharger and diesel engine is better.
【学位授予单位】：西安工程大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TK423

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