本文選題：汽輪發(fā)電機(jī)組 + 滑動(dòng)軸承　； 參考：《華北電力大學(xué)》2014年碩士論文

【摘要】：汽輪機(jī)發(fā)電機(jī)組是電力工業(yè)的核心設(shè)備。滑動(dòng)軸承作為汽輪發(fā)電機(jī)組的重要部件,其性能直接影響到汽輪機(jī)組的穩(wěn)定運(yùn)行,所以研究滑動(dòng)軸承的油膜特性對(duì)于保證機(jī)組穩(wěn)定運(yùn)行具有重要意義。 本文以大型汽輪發(fā)電機(jī)組滑動(dòng)軸承為研究對(duì)象,利用計(jì)算流體力學(xué)方法,計(jì)算并分析了滑動(dòng)軸承的油膜特性。論文主要進(jìn)行了以下三方面的工作：首先,建立了圓柱軸承、橢圓軸承及可傾瓦軸承的物理模型及數(shù)學(xué)模型,通過(guò)計(jì)算得到三種型式滑動(dòng)軸承油膜的壓力分布。在此基礎(chǔ)上,對(duì)比分析了圓柱軸承、橢圓軸承及可傾瓦軸承各自油膜的壓力特性,得到了關(guān)于三種軸承穩(wěn)定性的結(jié)論。其次,以600MW機(jī)組的橢圓軸承為研究對(duì)象,對(duì)比分析了轉(zhuǎn)速、進(jìn)油壓力、橢圓度等因素對(duì)橢圓滑動(dòng)軸承油膜壓力特性及溫度特性的影響,并得到了確保軸承穩(wěn)定運(yùn)行的最佳橢圓度。最后,對(duì)可傾瓦軸承的油膜進(jìn)行計(jì)算分析,通過(guò)改變轉(zhuǎn)速、瓦數(shù)及承載方式,得到了不同條件下可傾瓦軸承的壓力特性,揭示了這些因素對(duì)軸承承載力及穩(wěn)定性的影響,為大型汽輪發(fā)電機(jī)組轉(zhuǎn)子軸承系統(tǒng)的穩(wěn)定運(yùn)行及軸承設(shè)計(jì)的相關(guān)工作提供了理論支持。
[Abstract]:Turbine generator set is the core equipment of electric power industry. As an important part of turbogenerator, the performance of sliding bearing has a direct impact on the stable operation of steam turbine, so it is very important to study the oil film characteristics of sliding bearing to ensure the stable operation of turbine unit. In this paper, the oil film characteristics of the sliding bearings of large turbogenerator sets are calculated and analyzed by using computational fluid dynamics (CFD) method. The main work of this paper is as follows: firstly, the physical and mathematical models of cylindrical bearing, elliptical bearing and tilting pad bearing are established, and the pressure distribution of oil film of three types of sliding bearings is obtained by calculation. On this basis, the pressure characteristics of oil film of cylindrical bearing, elliptical bearing and tilting pad bearing are compared and analyzed, and the conclusions about the stability of three kinds of bearings are obtained. Secondly, taking the elliptical bearing of 600MW unit as the research object, the effects of rotational speed, oil inlet pressure and ellipticity on the oil film pressure and temperature characteristics of the elliptical sliding bearing are compared and analyzed. The optimum ellipticity to ensure the stable operation of the bearing is obtained. Finally, the oil film of tilting pad bearing is calculated and analyzed. The pressure characteristics of tilting pad bearing under different conditions are obtained by changing the speed, number of tile and bearing mode, and the influence of these factors on bearing capacity and stability is revealed. It provides theoretical support for the stable operation of the rotor bearing system and the design of the bearing.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM311

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本文編號(hào)：2017366