大型汽輪機(jī)轉(zhuǎn)子—刷式密封系統(tǒng)動力學(xué)特性研究
[Abstract]:Modern thermal power generation technology has promoted the development of high performance turbine mechanical sealing technology because of the higher and higher technical and economic requirements of power plant. Because the advanced brush sealing technology can significantly improve the reliability and working efficiency of large thermal power units, brush sealing has been more and more used in power plants. However, after a long period of operation, it is found that the friction heat between the brush seal and the rotating shaft not only affects the wire brushing, and then affects the sealing characteristics and flow field characteristics, but also affects the natural vibration characteristics of the rotor. Therefore, it is necessary to study the flow field characteristics of brush seal and the fluid-solid coupling vibration characteristics of rotor-brush seal system, which also reflects important scientific value and practical significance. In this paper, the relationship between the geometry and mechanics of a single brush wire and the rotor is studied, and then the expression of the force acting on the rotor by the whole circle brush wire is obtained. Then, by analogy with Thomas eight-parameter model, the rotor-brush seal force is fitted by quadratic multinomial fitting, and the expression of support stiffness coefficient can be obtained according to Taylor formula, and the rotor-brush seal stiffness model is deduced, which is easy to be applied. The simulation is carried out, which provides the model basis for the modal analysis of rotor-brush seal-bearing system in chapter 3 and chapter 5. The finite element analysis method and finite element equation are introduced. at the same time, the corresponding modeling element is briefly introduced, and then the finite element model is established according to the actual 10OOMW unit of a power plant. The natural frequency and vibration mode are solved by modal analysis without thermal stress and centrifugal force. The finite element numerical simulation results are compared with the data provided by the power plant, and it is found that the simulation results are more accurate, which verifies the correctness of the model and lays a foundation for the modal analysis under the action of fluid-solid coupling in the fifth chapter. The flow field characteristics of rotor-brush seal system are studied. The numerical analysis model of porous media is established, and the viscous resistance coefficient and inertia resistance coefficient of brush seal are calculated by using empirical formula, and then the leakage rate of brush seal outlet is solved by using FLUENT module in ANSYS Workbench collaborative platform. Compared with the experimental data in the literature, the rationality and correctness of using this method to calculate the resistance coefficient are indirectly verified. Then the flow field and temperature field of brush seal are analyzed. at the same time, the effects of specific pressure and rotating speed on the temperature field and the effects of pressure difference, rotating speed, interference and friction heat flow on the maximum temperature are studied. The effect of fluid-thermal-structure coupling on the stress and deformation of rotor-brush seal system is studied. On the basis of the flow field analysis in the third chapter, the fluid-thermal-structure unidirectional fluid-solid coupling simulation is carried out by using FLUENT module and Static Structural module, with emphasis on the simultaneous loading of flow field temperature load and centrifugal force load. The influence of rotating speed and interference on the stress and deformation of rotor. The modal analysis of rotor with thermal stress and centrifugal force is carried out by using Moda film block and Mechanical APDI module, and compared with the mode without fluid-solid coupling in chapter 3, the influence of fluid-solid coupling on the natural vibration characteristics of rotor is analyzed.
【學(xué)位授予單位】:東南大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TM621
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