基于热流耦合的齿轮对流换热及温度场分析

发布时间：2018-05-27 12:36

本文选题：齿轮 + 热流耦合　；参考：《重庆大学》2011年硕士论文

【摘要】：齿轮啮合过程中由于轮齿啮合面相对滑动将产生大量热量,若产生的热量不能及时散去则会导致齿轮的温度上升,引起齿轮的承载能力和工作性能的下降,甚至直接导致齿轮失效。齿轮箱的润滑冷却效果是决定齿轮温度的主要原因,而齿轮箱内润滑油的流动特性对其性能有较大的影响。因此,开展基于热流耦合的齿轮对流换热及温度场数值仿真分析,对改善齿轮副传热特性具有重要的理论意义及工程应用价值。本文课题来源于重庆市科技攻关计划项目。基于齿轮啮合原理、流体动力学和传热学理论,运用数值仿真方法,研究油浴润滑的齿轮箱内部流场、齿轮对流换热及齿轮温度场。本文的主要研究工作如下: ①将UG建立的渐开线齿轮副参数化模型导入Gambit中,建立齿轮箱内流体的计算模型;采用动网格及UDF技术,在Fluent中对齿轮箱油浴润滑的内部气液两相流场进行了瞬态特性数值模拟,得出瞬时油液分布、流体压力和速度。 ②对不同齿轮转速和浸油深度的齿轮箱内部流场进行流体动力学仿真,计算其瞬时油液分布以及压力、速度时间历程,对比分析了不同转速和浸油深度对齿轮箱内部流场特性的影响规律。 ③构建了包括流体与固体的齿轮箱三维瞬态传热有限元模型,计算了啮合齿面的平均热流量,利用Fluent软件对齿轮箱的传热模型进行热流耦合仿真分析,得出了齿轮对流换热系数的等值线。 ④对运转过程中齿轮的瞬态温度场进行了流体动力学仿真,得出不同时刻齿轮副的温度等值线以及轮齿啮合区附近节点的温度时间历程,并研究了转速对齿轮温度分布的影响。
[Abstract]:In the process of gear meshing, a large amount of heat will be produced due to the relative sliding of the gear tooth meshing surface. If the generated heat can not be dissipated in time, the temperature of the gear will rise and the bearing capacity and working performance of the gear will decrease. Even causes gear failure directly. The lubricating cooling effect of the gear box is the main reason for determining the gear temperature, and the flow characteristics of the lubricating oil in the gear box have great influence on its performance. Therefore, the numerical simulation analysis of convection heat transfer and temperature field based on heat flux coupling has important theoretical significance and engineering application value in improving the heat transfer characteristics of gear pair. This paper comes from the project of Chongqing Science and Technology Project. Based on the theory of gear meshing, fluid dynamics and heat transfer, the flow field, convection heat transfer and gear temperature field in oil bath lubricated gear box are studied by numerical simulation. The main work of this paper is as follows: 1. The parameterized model of involute gear pair established by UG was introduced into Gambit, and the calculation model of fluid in gear box was established. The transient characteristics of the gas-liquid two-phase flow field in the oil bath lubrication of the gear box are simulated in Fluent. The instantaneous oil distribution, fluid pressure and velocity are obtained. (2) the hydrodynamic simulation of the internal flow field of the gear box with different gear speed and oil immersion depth was carried out to calculate the instantaneous oil distribution and the pressure and velocity time history. The influence of different rotational speed and oil immersion depth on the flow field characteristics of the gearbox was analyzed. 3Three-dimensional transient heat transfer finite element model of gear box including fluid and solid is constructed, the mean heat flux of meshing tooth surface is calculated, and the heat transfer model of gear box is simulated and analyzed by Fluent software. The contour of convection heat transfer coefficient of gear is obtained. (4) the transient temperature field of gear is simulated by hydrodynamics, and the temperature isoline of gear pair at different times and the temperature time history of nodes near gear tooth meshing zone are obtained, and the influence of rotational speed on gear temperature distribution is studied.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH132.41

【引证文献】