棱杆式压缩机机组系统设计与试验研究

发布时间：2018-01-03 10:15

本文关键词：棱杆式压缩机机组系统设计与试验研究　出处：《哈尔滨工业大学》2012年硕士论文　论文类型：学位论文

【摘要】：压缩机作为重要的基础技术装备，它被广泛应用在汽车、化工等多种领域。目前市场上应用比较广泛的螺杆压缩机存在转子加工费用高、低转速时工作效率低的缺点。棱杆式压缩机是一种新型的压缩机，工作原理与螺杆式压缩机类似，其独特的转子型线使其具有比螺杆压缩机转子加工成本低、运行转速低、工作效率高的优势。本文对棱杆式压缩机样机的各个部件进行了设计。推导了容积流量、容积效率、轴功率、绝热效率以及喷油量的计算公式，并计算出压缩机在不同转速运转时的实际轴功率与喷油容积流量。分析了棱杆式压缩机机组系统的工作过程，并设计了压缩机机组系统。基于CFD仿真软件Fluent，，本文建立了棱杆式压缩机的二维几何模型，选取合适的计算模型和求解方法，对棱杆式压缩机的工作过程进行模拟，得到了不同瞬时的流场分布情况。建立不同的棱杆式压缩机模型，分析转子中心距和齿顶间隙对排气口压力的影响。针对同一个棱杆式压缩机模型，分析转速对排气压力的影响。仿真结果表明，转子中心距和齿顶间隙越大，排气压力就越低；对同一个压缩机模型，转速越高，排气压力就越高。在完成了对所设计的棱杆式压缩机的机加工和安装调试后，进行了磨合试验和压缩机机组系统的试验，测量了以两种不同转速运行时的排气压力。试验结果表明，棱杆式压缩机在2189r/min的较低转速时即可达到0.7MPa的常用排气压力，由此证明棱杆式压缩机能够满足实际工程应用的需要。将磨合试验结果与机组系统试验结果作对比分析，可知喷油方式对排气压力有影响。将机组系统试验结果与仿真结果作对比分析，可知试验数据与仿真结果基本吻合，验证了用Fluent软件仿真来分析流场、预测试验结果的可行性。
[Abstract]:Compressor as an important basic technology equipment, it is widely used in automotive, chemical and other fields. At present, screw compressor is widely used in the market there is a high cost of rotor processing. The edge compressor is a new type of compressor, its working principle is similar to that of screw compressor, its unique rotor profile makes it have lower machining cost than screw compressor rotor. Low running speed and high working efficiency. In this paper, the various components of the prototype of the prismatic compressor are designed, and the calculation formulas of volumetric flow rate, volumetric efficiency, shaft power, adiabatic efficiency and fuel injection amount are derived. The actual shaft power and the volume flow of oil injection are calculated when the compressor is running at different speeds. The working process of the compressor unit system is analyzed and the compressor unit system is designed. Based on the CFD simulation software Fluent. this paper establishes the two-dimensional geometric model of the prismatic compressor and selects the appropriate calculation model and solution method to simulate the working process of the prismatic compressor. Different instantaneous flow field distribution is obtained. Different edge compressor models are established, and the effects of rotor center distance and tooth top clearance on outlet pressure are analyzed. The simulation results show that the greater the rotor center distance and the tooth top clearance, the lower the exhaust pressure. For the same compressor model, the higher the speed, the higher the exhaust pressure. After finishing the machining and installation of the designed prismatic compressor, the running-in test and the compressor unit system test are carried out. The exhaust pressure at two different speeds is measured. The test results show that the discharge pressure of the prismatic compressor can reach 0.7 MPA at the lower speed of 2189r / min. It is proved that the prismatic compressor can meet the needs of practical engineering application. The result of running-in test is compared with the result of unit system test. It is known that the fuel injection mode has an effect on the exhaust pressure. By comparing the test results with the simulation results, we can see that the experimental data are in good agreement with the simulation results. The feasibility of using Fluent software to analyze the flow field and predict the test results is verified.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH45

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