50MW机组推力轴承的改进及运用

针对现役50MW机组推力轴承瓦温偏高现状,通过分析传统推力轴承结构,找出了轴承偏载及瓦温偏高的原因。从改进结构设计着手,推出了新型的LEG(LeadingEdgeGroove)推力轴承,并对LEG推力轴承和传统推力轴承性能进行了比较分析。通过LEG推力轴承和传统推力轴承的现场应用实例比较,证实了LEG推力轴承性能的优越性。

Theory and application of infrared surveying gas gushing technology in coal-rock roadway

Geological structure and gas expansion when gas pressure was released can affect the distribution of infrared radiation energy or temperature at coal rock surface. From this, the foundation of roadway infrared surveying technical was formed. According to the thermodynamic principle of ideal gas and the law of energy conservation, the relation was established between gas gushing amount from coal rock and air temperature to fall in roadway. At the same time, this paper has analyzed coal rock density change that geological structure aroused and the change exerted influences on infrared radiation power at surface, as well as, has analyzed the infrared radiation feature of gas gushing at geological structure district. Application results show that infrared survey technology can be used to analyze and forecast the change of coal rock gas gushing effectively, and to guide the enforcement of the roadway gas project of prevention and handling economically.

两相流中气泡含量对大型可倾瓦径向轴承性能影响的试验研究

可倾瓦滑动轴承是大型燃气轮机等旋转机械的重要部件,转子与轴瓦间隙内为复杂的油气混合两相流,其特性直接影响轴承性能。为了研究油气两相流对可倾瓦轴承性能的影响,本研究搭建了高速可倾瓦滑动轴承实验台,针对大尺寸定向润滑可倾瓦径向滑动轴承,在多载荷和多转速工况下进行不同气泡率的油气两相流试验。通过试验研究载荷、转速和两相流中气泡率对可倾瓦滑动轴承油膜压力、油膜厚度、瓦面温度和电动机功率的影响。相关试验结果有助于解释和理解空穴和贫油效应,并为优化可倾瓦轴承性能提供依据。