新型高速涡轮冷电并供动力轴系稳定性实验研究

发布时间：2018-06-22 22:11

本文选题：分布式供能系统 + 双透平与四磁盘同轴结构　；参考：《华北电力大学(北京)》2016年硕士论文

【摘要】：分布式供能系统以其高效,清洁作为未来能源发展方向的主体,受到各国的重视。而微小型燃气轮机作为分布式供能系统的核心部分,成为现代学术界研究的方向。本文依托于国家科技支撑计划项目“微型移动式燃气轮机冷热电联供技术及示范”,建立新型高速涡轮冷电并供动力轴系实验台。对基于气体轴承支撑的转子轴系进行实验研究。实验研究了转子轴向间隙、飞升特性等对轴系稳定性的影响。主要内容如下：1.搭建了新型高速涡轮冷电并供动力轴系实验台,结合实验台原理部分从功能和性能的角度介绍了实验台的动力单元、集控单元和主机单元。2.根据实验台动力轴系的结构特性,对其展开实验研究。首先,对双透平转子轴系的整体轴向间隙进行静态实验测量。其次,对轴系两端轴承供以相同的轴承气供气压力,通过测量两端轴承转子轴向间隙的变化,来探究两端轴承的阻力特性。最后,进行止推轴承止推性能静态实验。对两端轴承供给不同的供气压力,测得不同供气压力下的两端轴承轴向间隙,进而判断两端轴承的止推性能,并得出了不同供气压力下轴向间隙数据,以及两端轴承轴向间隙相等时的轴承供气压力组合,为实验过程中轴承供气压力的调节,提供借鉴意义。3.根据轴向静态实验的结果调节两端轴承的供气压力,使两端轴向间隙变化。分别对左端轴承轴向间隙小于右端、左端轴承轴向间隙大于右端、左端轴承轴向间隙等于右端三种情况下进行一系列的轴系动态实验。探究两端轴承供气压力、轴承转子轴向间隙改变时,转子轴系的振动特性,并寻找出静态实验结果对动态实验的指导意义。4.通过运用非线性分析方法对两个透平与四磁盘同轴结构的转子系统升速过程出现的低频特性和飞升特性进行了分析,与汽机中的现象进行对比,探究了其轴系本身的特性,并给出一些实验调节措施。并对对实验室中基于非线性图谱建立的适用于气体轴承轴系的非线性振动测试分析方法的有效性在新型高速涡轮冷电并供动力轴系的振动特性及稳定性实验研究中给予了验证。
[Abstract]:Distributed energy supply system is regarded by many countries as the main body of energy development in the future with its high efficiency and cleanliness. As the core of distributed energy supply system, micro gas turbine has become the research direction of modern academic circles. Based on the national science and technology support project "Micro mobile gas turbine combined cooling and heat supply technology and demonstration", a new high speed turbine cooling and power supply shafting test bench is established in this paper. An experimental study of rotor shafting based on gas bearing support was carried out. The effects of rotor axial clearance and hoisting characteristics on the stability of the shaft system are experimentally studied. The main content is as follows: 1. A new high speed turbo cooling and power supply shafting test bench is built. The power unit, centralized control unit and main engine unit of the test bench are introduced from the point of view of function and performance combined with the principle of the test bench. According to the structural characteristics of the power shafting of the test table, the experimental study is carried out. First, the axial clearance of dual turbine rotor shaft system is measured by static experiments. Secondly, the bearing pressure on the two ends of the shaft system is the same, and the resistance characteristics of the two end bearings are investigated by measuring the change of the axial clearance of the two end bearing rotor. Finally, static test of thrust performance of thrust bearing is carried out. The axial clearance of the two ends bearing under different air supply pressure is measured to judge the thrust performance of the two end bearing, and the axial clearance data under different air supply pressure are obtained. The combination of bearing air supply pressure with equal axial clearance between two ends of bearing provides reference for the adjustment of bearing air supply pressure in the course of experiment. According to the results of axial static experiment, the air supply pressure of the two ends bearing is adjusted to change the axial clearance at both ends. A series of dynamic experiments were carried out under three conditions: the axial clearance of the left bearing is less than the right end, the axial clearance of the left end is greater than the right end, and the axial clearance of the left end of the bearing is equal to the right end. This paper probes into the vibration characteristics of the rotor shaft system when the air supply pressure at both ends of the bearing is changed and the axial clearance of the bearing rotor changes, and finds out the guiding significance of the static experimental results to the dynamic experiment. By using nonlinear analysis method, the low frequency and flying characteristics of two rotor systems with coaxial structure of four disks and two turbines are analyzed. Compared with the phenomena in steam turbine, the characteristics of shafting itself are explored. Some experimental adjustment measures are also given. The validity of the nonlinear vibration test method for gas bearing shafting based on nonlinear spectrum is verified in the experimental study on the vibration characteristics and stability of a new type of high speed turbine cooling and power supply shafting.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM61

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