計(jì)入空化效應(yīng)的水潤滑徑向滑動(dòng)軸承數(shù)值模擬研究
[Abstract]:The research on water lubrication theory and application can provide the theoretical basis and reference basis for the development of various friction pairs with water as the lubricating medium and various environment-friendly machinery. It can solve the problem of ecological environment pollution caused by oil leakage of machinery and equipment, purify and protect the environment on which human beings depend for survival, and serve for the construction of resource-saving and environment-friendly society for sustainable development. The tribological properties of water-lubricated bearings are greatly affected by bearing materials, structures and working conditions. There is no satisfactory method to select and design the material and structure of water lubricated bearing and make it have lower friction coefficient and higher bearing capacity under various working conditions. Compared with oil lubrication, water film thickness of water lubricated bearing is thinner, thermal elastohydrodynamic lubrication numerical calculation is not easy to converge, and water lubricated bearing is easy to enter turbulent state from laminar flow state and produce cavitation phenomenon. In addition, there are many guiding tanks for water lubricated bearings, and the establishment of hydrodynamic models is quite complex. Therefore, no important progress and breakthrough have been made in the study of the lubrication mechanism of water lubricating bearings. Considering the cavitation effect of water, the thermo-elastohydrodynamic lubrication analysis and the dynamic lubrication analysis of the water lubricated radial bearing are carried out in this paper, and the lubricating performance of the water lubricated radial bearing is analyzed. The main contents and conclusions of this paper are as follows: using Reynolds cavitation boundary condition, the basic equations of thermo-elastohydrodynamic lubrication are constructed, and the basic equations of thermo-elastohydrodynamic lubrication are solved by multi-grid algorithm. The influence of the mechanical properties of bearing materials on the lubricating properties of water lubricated bearings. The dimensionless pressure curve, dimensionless film thickness curve, maximum temperature rise and temperature distribution under different elastic modulus, different load and rotational speed are given. The results show that when the load, rotational speed, friction and wear properties are satisfied, the materials with small elastic modulus should be selected, the material with high elastic modulus should be selected when the load is large, the bearing material with high elastic modulus should be selected, and the bearing material with high elastic modulus should be selected. The emphasis of material modification is to increase its self-lubricating property and heat conduction coefficient. Based on FLUENT software package, the numerical simulation of water lubricated radial sliding bearing in turbulent lubrication state was carried out, and the turbulence model, wall function method and cavitation model for water lubricated radial sliding bearing were found out. The flow field and lubricating performance of water lubricated radial sliding bearings with straight guide flume were numerically simulated. The results show that the pressure field calculated by using three k 蔚 turbulence models, Schnerr and Sauer cavitation model or Zwart-Gerber-Belamri cavitation model is the best agreement with the experimental results when the water lubricated bearing is numerically simulated in turbulent state. In the state of full film lubrication, the bearing capacity of water lubricated bearing decreases and the friction coefficient increases after the water lubricating bearing opens the straight guide tank, and the more the guide tank, the greater the friction force and the smaller the bearing capacity. In addition to a vortex near the size of the guided-tank, there are other smaller swirls. There exists a main pressure peak and several small independent pressure peaks in the circumferential pressure curve of the journal on the axisymmetric plane. The cavitation of water-lubricated bearings mainly occurs on the surface of the journal.
【學(xué)位授予單位】:上海交通大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2011
【分類號】:TH133.31
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