本文關(guān)鍵詞：滾動(dòng)軸承油氣兩相流潤滑特性研究　出處：《北方工業(yè)大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 油氣潤滑 潤滑噴嘴 深溝球軸承 熱流耦合

【摘要】：滾動(dòng)軸承在機(jī)械設(shè)備中的應(yīng)用非常廣泛,它的潤滑狀態(tài)決定著整個(gè)系統(tǒng)的工作情況。近年來,隨著油氣潤滑技術(shù)的快速發(fā)展,這種新型的氣液兩相冷卻潤滑技術(shù)越來越多的被運(yùn)用于滾動(dòng)軸承中。 隨著計(jì)算流體力學(xué)CFD的高速發(fā)展,各種計(jì)算流體力學(xué)軟件逐漸成熟起來,為多物理場耦合分析提供了可能,滾動(dòng)軸承熱機(jī)耦合、熱流耦合分析也逐漸成為人們研究的熱點(diǎn)問題。 本文基于油氣潤滑在滾動(dòng)軸承中的應(yīng)用,以圓柱形潤滑噴嘴內(nèi)外流場和滾動(dòng)軸承溫度場為研究對象,運(yùn)用計(jì)算流體力學(xué)CFD分析軟件Fluent進(jìn)行模擬仿真分析,探討環(huán)狀流在流經(jīng)噴嘴時(shí)的流動(dòng)狀態(tài)和滾動(dòng)軸承在油氣潤滑工況下的溫度場隨流場的變化規(guī)律,對油氣潤滑技術(shù)的發(fā)展和應(yīng)用具有一定的指導(dǎo)意義。 研究結(jié)果表明： (1)環(huán)狀流在噴嘴內(nèi)外流場的流動(dòng)狀態(tài)與噴嘴的結(jié)構(gòu)參數(shù)有關(guān),噴嘴的收縮角和出口直徑對環(huán)狀流的液膜流動(dòng)較大的影響。 (2)滾動(dòng)軸承的轉(zhuǎn)速和潤滑油粘度對軸承的發(fā)熱量有較大的影響。軸承腔內(nèi)部與空氣的對流換熱系數(shù)與軸承轉(zhuǎn)速和壓縮空氣的流量有關(guān),在噴嘴出口直徑很小的情況下,空氣入口速度對對流換熱系數(shù)的影響較小。 (3)對油氣潤滑條件下的深溝球軸承進(jìn)行熱源分析和生熱計(jì)算,得出了深溝球軸承在不同轉(zhuǎn)速下的發(fā)熱量和對流換熱系數(shù),并運(yùn)用Fluent軟件對軸承的三維模型進(jìn)行熱流耦合計(jì)算,得到了不同工況下的軸承工作溫度。通過與傳統(tǒng)油潤滑狀態(tài)下的軸承溫度場仿真計(jì)算結(jié)果對比分析,得出油氣潤滑下的軸承溫度遠(yuǎn)低于油潤滑狀態(tài)下的軸承工作溫度。
[Abstract]:Rolling bearing is widely used in mechanical equipment, its lubrication state determines the working situation of the whole system. In recent years, with the rapid development of oil and gas lubrication technology. This new gas-liquid two-phase cooling lubrication technology is more and more used in rolling bearings. With the rapid development of computational fluid dynamics (CFD), a variety of computational fluid dynamics software has matured gradually, which provides the possibility for multi-physical field coupling analysis, rolling bearing thermo-mechanical coupling. Heat flux coupling analysis has gradually become a hot issue. Based on the application of oil and gas lubrication in rolling bearing, this paper takes the inner and outer flow field of cylindrical lubricating nozzle and the temperature field of rolling bearing as the research object. The computational fluid dynamics CFD analysis software Fluent is used to simulate and analyze. The study of the flow state of annular flow through the nozzle and the variation of temperature field of rolling bearing with the flow field under the condition of oil and gas lubrication have certain guiding significance for the development and application of oil and gas lubrication technology. The results show that: 1) the flow state of the annular flow inside and outside the nozzle is related to the structure parameters of the nozzle, and the shrinkage angle and the outlet diameter of the nozzle have great influence on the liquid film flow of the annular flow. The speed of rolling bearing and the viscosity of lubricating oil have great influence on the heat of bearing. The convection heat transfer coefficient between bearing chamber and air is related to the speed of bearing and the flow rate of compressed air. When the nozzle outlet diameter is very small, the influence of air inlet velocity on convection heat transfer coefficient is small. 3) the heat source analysis and heat generation calculation of deep groove ball bearing under the condition of oil and gas lubrication are carried out, and the heat and convection heat transfer coefficient of deep groove ball bearing at different rotational speeds are obtained. The Fluent software is used to calculate the heat flux coupling of the three dimensional model of the bearing. The operating temperature of bearing under different working conditions is obtained and compared with the simulation results of bearing temperature field under the condition of traditional oil lubrication. The bearing temperature under oil-gas lubrication is much lower than that under oil-lubricated condition.
【學(xué)位授予單位】：北方工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH133.33

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