环境温度对涡轮增压器的影响毕业论文设计.doc

环境温度对涡轮增压器的影响毕业论文设计内容摘要 了解环境温度对涡轮增压器的影响，采取何种措施保证柴油机安全可靠地运行，同时又满足使用要求，这是柴油机研制者及用户历来关心的问题。 本论文对压气机特性参数随环境温度的变化进行了较深入的研究。 首先，本文介绍了船用涡轮增压柴油机压气机特性及其数值计算，并对空冷器进布了了数学建模。 然后，用图解法对压气机特性参数随坏境温度的变化进行了详细地分析，得出了其主要参数和空冷器热负荷随环境温度变化的变化趋势，以MAN BW S80MC型柴油机为实例进行研究，并借助Visul Basic编程语言，编写了“MAN BW型柴油机压气机空气质量流量和空冷器热负荷的计算程序”。接着又以哈尔滨船厂6200GZC柴油机的实验数据进一步验证了结论的正确性，为了更直观地看出各参数随环境温度的变化，本文采用Mat lab对其进行了曲线拟合。本文还提出了性能参数修补的必要性彩用方法，并以“远大湖”主机一些相关参数为例进行了修正计算。 最后文章在计算和查阅相关技术资料的基础上，讨论了实现空冷器变流量冷却的必要性和实现方式，使其在达到冷却目的的前提下，节约泵功，充分发挥其冷却能力。所获结论有助于轮机管理人员对不同温度下涡轮增压柴油机的工作性能正确地认识和理解，以采取相应的管理措施。关键词:船用涡轮增压柴油机；压气机特性参数；环境温度；变流量冷却Abstract The marine diesel makers and users always concem the matter of the influence of ambient temperature on turbocharger，and what measures they should take to ensure the diesel work safely and reliably，to satisfy the requirement of the diesel. The paper analyzes the comPressors parameters，which vary with the ambient te perature. At first，it introduces the Performance and arithmetics analysis ofthe compresor，then builds mathematic model for the air cooler. Secondly，the paper studies the relation between the change of compressors working Point and the change of surrounding temperature by charts，Points out the change trend of its parameters and the air cooler load. It is verified by an example of S80MC.By the means of Visual Basic，the Calculation Program of the flow of the compressor and the load of the air cooler for MAN BW is finished . In order to further verify the veracity of the conclusions，an experiment is done on diesel 6200GZC in the dockyard of Harbin。For directly making out the change of the parameters with the temperatrue，the data are dealt with Matlab.In the end of this chapter，the chapter,the paper Proposes the necessity and methods of the parameters correction, then takes the Cosgreat Lake ship for example. At last, according to the calculation and some related technique data, the paper discusses the necessity and the realization of the air cooler