核主泵轴承试验台推力加载装置性能研究

发布时间：2019-01-23 10:05

【摘要】：在某核反应堆冷却循环系统中,主泵轴承作为系统中关键的旋转部件,其承载性能直接关系着冷却循环系统的稳定运行。为对主泵轴承进行全工况轴向加载模拟试验,设计大负载高速双向推力加载试验台,其中轴向加载装置是试验台的核心部件,其承载性能对整个系统正常运行至关重要。由于该装置负载大、尺寸大、转速相对较高,在设备运转过程容易发生油膜失效、磨损,甚至烧瓦等情况,导致系统异常运行或停机。本文以该试验台推力加载装置为研究对象,研究该加载装置内部流场、油膜承载性能及其影响因素,分析热流固耦合变形,并提出结构改进方案,主要研究内容如下:1、基于N-S方程建立三维油膜数值分析模型,研究不同工况下油膜流场压力与速度分布特性,分析转速、入口油压、粘温效应对油膜承载性能的影响。2、建立推力加载装置热流固耦合模型,耦合求解加载装置推力盘的弹性变形、热变形、热弹变形,探讨油膜破裂的影响因素。3、基于油膜承载性能分析与热流固耦合变形分析,对原型加载装置进行结构改进,提出四种改进方案:(1)将环形单油腔改进成扇形三油腔形式;(2)将环形单油腔沿径向内移2mm和6mm;(3)改变油腔深度;(4)改变推力盘厚度。通过数值计算求解,分析上述四种改进方案的可行性。4、结合实际选取最佳改进方案,将环形油腔形式改进成为扇形三油腔形式,对改进后的结构进行加工制造并开展新的加载试验,验证改进方案的可行性和数值计算方法的适用性,为实际核主泵轴承加载装置设计与应用提供重要参考和依据。
[Abstract]:In a nuclear reactor cooling cycle system, the main pump bearing is a key rotating component in the system, and its bearing capacity is directly related to the stable operation of the cooling cycle system. In order to simulate the axial loading of the main pump bearing under all working conditions, a high load and high speed bidirectional thrust loading test-bed is designed, in which the axial loading device is the core part of the test bed, and its bearing capacity is very important to the normal operation of the whole system. Due to the large load, large size and relatively high rotational speed, the equipment is prone to oil film failure, wear and even burning tile, which leads to abnormal operation or shutdown of the system. In this paper, the thrust loading device of the test-bed is taken as the research object, the internal flow field, the oil film bearing capacity and its influencing factors are studied, the heat fluid-solid coupling deformation is analyzed, and the structure improvement scheme is put forward. The main research contents are as follows: 1. Based on N-S equation, a three-dimensional oil film numerical analysis model is established to study the pressure and velocity distribution characteristics of oil film flow field under different operating conditions, and to analyze the effects of rotational speed, inlet oil pressure and viscosity temperature effect on the oil film bearing performance. The thermo-fluid-solid coupling model of the thrust loading device is established to solve the elastic deformation and thermoelastic deformation of the thrust disk, and the factors affecting the oil film rupture are discussed. 3, based on the analysis of the oil film load-bearing performance and the thermofluid-solid coupling deformation analysis, The structure of the prototype loading device is improved and four improvement schemes are proposed: (1) the annular single oil cavity is improved into a sector-shaped three-oil cavity; (2) the annular single oil cavity is moved 2mm and 6mm along the radial direction; (3) the depth of the oil chamber is changed; (4) the thickness of the thrust disc is changed. The feasibility of the above four improved schemes is analyzed by numerical calculation. 4. The annular oil cavity form is improved to the sector three oil cavity form by selecting the best improvement scheme combined with the actual situation. The improved structure is machined and manufactured and a new loading test is carried out to verify the feasibility of the improved scheme and the applicability of the numerical calculation method, which provides an important reference and basis for the design and application of the bearing loading device of the actual nuclear main pump.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM623.4

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