【摘要】：油-氣潤滑中,潤滑劑高速空氣的作用下沿著管壁向前移動,并以精細(xì)油滴的形式噴射到潤滑點�，F(xiàn)階段,大多數(shù)研究集中在實際應(yīng)用環(huán)節(jié),所得結(jié)論僅適用于軸承、高速電主軸等具體零部件。本文以線接觸副為研究對象,觀測不同潤滑參數(shù)下,線接觸油氣潤滑流動行為與潤滑特性,并探討兩者之間的關(guān)系。這既可以為后續(xù)開展?jié)櫥瑓?shù)設(shè)計提供參考,也可以為生產(chǎn)實踐提供指導(dǎo)。主要工作內(nèi)容與結(jié)論如下:1)利用數(shù)值模擬觀測線接觸油-氣潤滑流場。將線接觸油-氣潤滑系統(tǒng)簡化為二維模型,通過CFD軟件FLUENT,選擇多相流VOF模型與RNG k-?模型,設(shè)定適當(dāng)?shù)奈锢韰?shù)與邊界條件,采用非穩(wěn)態(tài)模型,開展數(shù)值模擬研究。觀測了線接觸副油-氣潤滑空間流場分布與環(huán)表面油相體積分布,發(fā)現(xiàn)環(huán)表面不同位置處油相體積分?jǐn)?shù)平均值在0.1~1之間,該模擬結(jié)果與事實相符并且與相應(yīng)文獻所得的結(jié)論相符合,驗證了數(shù)值模擬方法研究的合理性。2)利用上述二維模型,研究了不同影響因素下線接觸副油-氣潤滑流動行為。通過分析不同參數(shù)下油-氣兩相流云圖與環(huán)表面油相體積分?jǐn)?shù),得到了不同供油量、供氣速度、轉(zhuǎn)速、表面粗糙度、噴射方位等因素下油-氣兩相流動行為特征。發(fā)現(xiàn)供油量q"g0.8ml/min、供氣速度v"f5m/s均會引起潤滑油在環(huán)表面的累積,表面油相體積分?jǐn)?shù)較大;供油量q"f0.2ml/min、供氣速度v"g20m/s時入口區(qū)潤滑油分布少,油相體積分?jǐn)?shù)低。噴射方位會改變?nèi)肟趨^(qū)壓力分布,影響油-氣兩相流動行為。表面粗糙度的增加、粘度的增加、轉(zhuǎn)速的增大均會提高環(huán)表面油相體積分?jǐn)?shù),其中粘度與轉(zhuǎn)速的影響較小。3)設(shè)計線接觸油-氣潤滑系統(tǒng),開展了不同影響因素下線接觸油-氣潤滑效果的試驗研究。采集不同供油量、供氣速度、噴射方位、轉(zhuǎn)速、載荷下線接觸摩擦系數(shù),聯(lián)系其流動行為,探討了油-氣潤滑特性。發(fā)現(xiàn)供氣速度v=5m/s時,氣流難以帶動潤滑油流動,環(huán)表面油相體積分?jǐn)?shù)大,試驗中潤滑油無法噴射至環(huán)表面,摩擦副干摩擦狀態(tài),摩擦系數(shù)大;供油量q=2ml/min時,環(huán)表面油相體積分?jǐn)?shù)小,呈現(xiàn)乏油狀態(tài),摩擦系數(shù)較大;增大供油量、供氣量,摩擦系數(shù)迅速下降;繼續(xù)增大供應(yīng),摩擦系數(shù)保持穩(wěn)定;試驗參數(shù)范圍內(nèi),增大轉(zhuǎn)速與載荷會降低摩擦系數(shù),其中轉(zhuǎn)速對摩擦系數(shù)影響較大。
[Abstract]:In oil-gas lubrication, the lubricant moves forward along the pipe wall under the action of high speed air and is ejected into the lubrication point in the form of fine oil droplets. At present, most of the research focuses on practical applications, and the conclusions are only applicable to bearings, high-speed motorized spindle and other specific parts. In this paper, the oil / gas lubricating flow behavior and lubrication characteristics of line contact are observed under different lubrication parameters, and the relationship between them is discussed. This can not only provide reference for further development of lubrication parameter design, but also provide guidance for production practice. The main contents and conclusions are as follows: 1) numerical simulation is used to observe the oil-gas lubricated flow field. The linear contact oil-gas lubrication system is simplified into a two-dimensional model. The multiphase flow VOF model and RNG k-model are selected by CFD software FLUENT,. Model, set appropriate physical parameters and boundary conditions, adopt unsteady model, and carry out numerical simulation. The spatial flow field distribution and the oil phase volume distribution on the ring surface are observed. It is found that the average value of the oil phase volume fraction at different positions on the ring surface is between 0.1 and 1. The simulation results are consistent with the facts and the conclusions obtained in the corresponding literatures, which verify the rationality of the numerical simulation method. 2) the oil-gas lubricating flow behavior of the linear contact pairs under different influence factors is studied by using the two-dimensional model mentioned above. By analyzing the oil-gas two-phase flow cloud pattern and the volume fraction of oil phase on the ring surface under different parameters, the characteristics of oil-gas two-phase flow behavior under different oil supply rate, gas supply speed, rotational speed, surface roughness and injection azimuth were obtained. It is found that Q "g0.8ml / min and v" f5m/s can cause the accumulation of lubricating oil on the ring surface, and the volume fraction of the oil phase on the surface is larger. When Q "f 0.2 ml / min and V" g20m/s, the oil distribution in the inlet area is small and the volume fraction of oil phase is low. The injection azimuth will change the pressure distribution in the inlet area and affect the oil-gas two-phase flow behavior. The increase of surface roughness, viscosity and rotational speed will increase the volume fraction of oil phase on the ring surface. An experimental study on the lubricating effect of line contact oil-gas under different influencing factors was carried out. The lubrication characteristics of oil and gas are discussed by collecting the friction coefficient of line contact under different oil supply quantity, gas supply velocity, injection direction, rotation speed and load. It is found that the flow of lubricating oil is difficult to be driven by air flow when the gas supply rate is v=5m/s, the volume fraction of oil phase on the ring surface is large, the lubricating oil can not be injected to the ring surface in the test, the dry friction state of the friction pair and the friction coefficient are large. When the oil supply is q=2ml/min, the volume fraction of the oil phase on the ring surface is small and the friction coefficient is large, the friction coefficient is stable when the oil supply is increased, the gas supply is increased, and the friction coefficient decreases rapidly. In the range of test parameters, the friction coefficient will be reduced by increasing the rotational speed and load, among which the friction coefficient will be greatly affected by the rotational speed.
【學(xué)位授予單位】：安徽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH117.2

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