双螺杆压缩机内部流场特性的分析与研究

发布时间：2018-06-05 14:17

本文选题：双螺杆压缩机 + 内部流场仿真　；参考：《陕西理工大学》2017年硕士论文

【摘要】：空气因其输送方便、无污染的特点被广泛应用于双螺杆压缩机中,双螺杆空气压缩机设备应运而生,成为农业、工业、能源等众多行业的新宠。但由于其内部结构复杂、空间狭小,空气的真实流动难以通过实验测量,于是吸引了许多业内人士对其内部空气流动特性进行研究;此外,现代计算机技术的发展弥补了这一缺陷,通过计算机软件对压缩机内部流场进行数值模拟可有效追踪气体在其内部的真实流动情况。转子副是螺杆压缩机的核心部件,其运动形态主要取决于转子所处的流场环境,反之,流场特性又影响着转子的运动形态。为确保转子系统安全工作,进一步提高螺杆压缩机的工作性能。通过SolidWorks建立转子的三维虚拟模型,采用Fluent对压缩机内部流场进行仿真计算,并得到转子副在流固耦合下的热变形分布,从而为合理设置转子补偿间隙提供了依据。主要内容安排如下:1.建立了双螺杆压缩机内部流场的计算域模型。基于流体流动理论,结合压缩机的实际运行工况,得到压缩机内部流场的计算域模型:进气通道、压缩腔和排气通道。2.双螺杆压缩机内部流场分析。采用Mesh模块对流体模型进行网格划分,在Fluent中进行相应的动网格、边界条件和求解条件设置,最终得到不同时刻气流场压力、速度、温度的分布规律。3.双螺杆转子的流固耦合热力变形分析。基于流固耦合力学分析理论,结合热力学原理对转子建立流固耦合传热模型,得到转子在温度场和力场综合作用下的变形分布。4.压缩机泄漏机理分析。从转子形成原理分析压缩机的间隙分布并建立相应的泄露模型,提出四种间隙补偿方法并结合陕西汉江机床有限公司转子加工实验进行研究。本文基于流体力学、空气动力学理论,结合热力学原理,借助计算机软件对双螺杆压缩机进行建模仿真,实现了对其内部空气流动的有效追踪。分析结果对优化压缩机结构、改善压缩机性能有一定的参考价值。
[Abstract]:Air is widely used in twin-screw compressor because of its convenient transportation and no pollution. The equipment of twin-screw air compressor has emerged as the times require, and has become a new favorite in many industries such as agriculture, industry, energy and so on. However, due to its complex internal structure and narrow space, it is difficult to measure the real flow of air through experiments, so it attracts many people in the industry to study its internal air flow characteristics; in addition, The development of modern computer technology makes up for this defect. Numerical simulation of the internal flow field of compressor can effectively track the real flow of gas in the compressor by computer software. Rotor pair is the core component of screw compressor, and its motion pattern mainly depends on the flow field environment of the rotor. On the contrary, the flow field characteristics affect the rotor motion pattern. In order to ensure the safety of rotor system, the working performance of screw compressor is further improved. The three-dimensional virtual model of rotor is established by SolidWorks, and the flow field of compressor is simulated by fluent, and the thermal deformation distribution of rotor pair under fluid-solid coupling is obtained, which provides the basis for setting rotor compensation clearance reasonably. The main contents are as follows: 1. The calculation domain model of internal flow field of twin screw compressor is established. Based on the fluid flow theory and combined with the actual operating conditions of the compressor, the computational domain models of the internal flow field of the compressor are obtained: intake channel, compression chamber and exhaust channel. Analysis of internal flow field of twin screw compressor. Mesh module is used to mesh the fluid model, and the corresponding moving mesh, boundary condition and solution condition are set in fluent. Finally, the distribution law of pressure, velocity and temperature of air flow field at different time is obtained. Analysis of fluid-solid coupled Thermodynamic deformation of Twin-screw rotor. Based on the theory of fluid-solid coupling mechanics and thermodynamics, the fluid-solid coupling heat transfer model of rotor is established, and the deformation distribution of rotor under the combined action of temperature field and force field is obtained. Mechanism analysis of compressor leakage. According to the principle of rotor formation, the clearance distribution of compressor is analyzed and the corresponding leakage model is established. Four kinds of gap compensation methods are put forward and combined with the rotor machining experiment of Shaanxi Hanjiang Machine tool Co., Ltd. Based on the theory of hydrodynamics and aerodynamics and the principle of thermodynamics, this paper models and simulates the twin screw compressor with the aid of computer software, and realizes the effective tracing of the internal air flow. The analysis results have certain reference value for optimizing compressor structure and improving compressor performance.
【学位授予单位】：陕西理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH45

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