项目名称： 轴振与非对称流场耦合作用下船舶尾轴承瞬态润滑机理研究

项目编号： No.51506225

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 能源与动力工程

项目作者： 李强

作者单位： 中国石油大学（华东）

项目金额： 21万元

中文摘要： 尾轴承是深海海洋平台定位动力与抗风暴侧推螺旋桨的关键部件，起着支撑尾轴和螺旋桨的作用。尾轴承润滑好坏不仅直接影响其是否可靠稳定工作，而且也间接关系到平台的正常航行与在强风暴下的生存能力。本项目首先提出一种全新的适用于瞬态流场计算的变流域动网格方法，实现多重流固耦合下轴承变流域动网格的网格畸变控制；其次，考虑多种非线性激励力作用建立螺旋桨轴系运动方程，开展热流固多场耦合作用下尾轴承的低粘度介质液膜润滑性能研究，揭示轴振与非对称流场耦合作用下船舶尾轴承的瞬态润滑机理；最后，设计转子-滑动轴承性能试验装置，验证理论预测结果，揭示尾轴承瞬态流场与螺旋桨轴稳定性之间的内在关系，提出影响尾轴承动力特性的关键因素。项目成果旨在完善水润滑轴承的工程设计理论，为我国深度研制具有自主知识产权的深海钻井平台航行与定位动力系统提供理论支撑。

中文关键词： 船舶尾轴承；瞬态特性；流固耦合；水润滑；多源激励

英文摘要： Stern tube bearing is one of the most key components on the deep sea oil platform. It is important for the oil platform to supply power for positioning platform and resisting storm. And it also plays a significant role in bracing stern shaft and propeller. If lubrication of stern tube bearing is broken, contact wear will occur at the contact portion between journal and bearing. The platform cannot work continuously, stably, reliably. Normal sailing and ability to resist storm will be influenced as well. The project presents an entirely new approach to dynamic mesh that is applicable to the calculation of transient flow field at first, and realizes multiple fluid-structure coupling calculation with transient flow field of bearing to control mesh distortion. In the second place, several kinds of nonlinear excitation will be considered to build the motion equations of shaft system. The performance of low viscosity lubricant film with the effects of multiple fluid-structure coupling will also be researched to find out the transient lubricating mechanism of marine stern tube bearing under the influence of the coupling of axis vibration and asymmetrical flow field. At last, by designing a performance test of rotor bearing system and large experiments and theory calculation, the interior relations between transient flow field of stern tube bearing and stability of propeller axis will be shown, the key point of affecting the dynamic behaviors of stern tube bearing could also be found out. This project aims to consummate the engineering design theory of water lubrication bearing, supplies the theoretic support for the study of the navigation of deep sea drilling platform and the dynamic positioning system with self-owned intellectual property rights by our own country.

英文关键词： marine stern tube bearing ;transient characteristic;fluid-structure interaction;water lubrication;multiple excitations