【摘要】：在某核反應(yīng)堆冷卻循環(huán)系統(tǒng)中,主泵軸承作為系統(tǒng)中關(guān)鍵的旋轉(zhuǎn)部件,其承載性能直接關(guān)系著冷卻循環(huán)系統(tǒng)的穩(wěn)定運(yùn)行。為對(duì)主泵軸承進(jìn)行全工況軸向加載模擬試驗(yàn),設(shè)計(jì)大負(fù)載高速雙向推力加載試驗(yàn)臺(tái),其中軸向加載裝置是試驗(yàn)臺(tái)的核心部件,其承載性能對(duì)整個(gè)系統(tǒng)正常運(yùn)行至關(guān)重要。由于該裝置負(fù)載大、尺寸大、轉(zhuǎn)速相對(duì)較高,在設(shè)備運(yùn)轉(zhuǎn)過程容易發(fā)生油膜失效、磨損,甚至燒瓦等情況,導(dǎo)致系統(tǒng)異常運(yùn)行或停機(jī)。本文以該試驗(yàn)臺(tái)推力加載裝置為研究對(duì)象,研究該加載裝置內(nèi)部流場(chǎng)、油膜承載性能及其影響因素,分析熱流固耦合變形,并提出結(jié)構(gòu)改進(jìn)方案,主要研究?jī)?nèi)容如下:1、基于N-S方程建立三維油膜數(shù)值分析模型,研究不同工況下油膜流場(chǎng)壓力與速度分布特性,分析轉(zhuǎn)速、入口油壓、粘溫效應(yīng)對(duì)油膜承載性能的影響。2、建立推力加載裝置熱流固耦合模型,耦合求解加載裝置推力盤的彈性變形、熱變形、熱彈變形,探討油膜破裂的影響因素。3、基于油膜承載性能分析與熱流固耦合變形分析,對(duì)原型加載裝置進(jìn)行結(jié)構(gòu)改進(jìn),提出四種改進(jìn)方案:(1)將環(huán)形單油腔改進(jìn)成扇形三油腔形式;(2)將環(huán)形單油腔沿徑向內(nèi)移2mm和6mm;(3)改變油腔深度;(4)改變推力盤厚度。通過數(shù)值計(jì)算求解,分析上述四種改進(jìn)方案的可行性。4、結(jié)合實(shí)際選取最佳改進(jìn)方案,將環(huán)形油腔形式改進(jìn)成為扇形三油腔形式,對(duì)改進(jìn)后的結(jié)構(gòu)進(jìn)行加工制造并開展新的加載試驗(yàn),驗(yàn)證改進(jìn)方案的可行性和數(shù)值計(jì)算方法的適用性,為實(shí)際核主泵軸承加載裝置設(shè)計(jì)與應(yīng)用提供重要參考和依據(jù)。
[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.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM623.4

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