液黏传动摩擦副流场特性研究

发布时间：2018-03-27 06:14

本文选题：液黏传动　切入点：纯油膜剪切　出处：《太原理工大学》2017年硕士论文

【摘要】：刮板输送机是煤矿井下综采工作面主要设备之一,因其驱动形式的不同,能耗和性能表现也不同。CST可控启动装置中的技术核心——液黏传动作为一种较为新型的传动形式,具有无级调速、高效节能、启动冲击小等特点,是实现机械传动设备节能降耗的有效技术手段。在CST液黏传动工作过程中,摩擦副的转速差会使其间隙内流体因内摩擦而导致黏性耗散的产生,进而使摩擦副和工作油液的温度升高,输出的转矩降低,最终导致传动的性能降低。通过对摩擦副流场特性的研究可以为离合器的转矩预测提供理论基础以及分析流场温度变化所产生的影响,进而为液黏传动技术的研究和大功率液黏传动设备的研发提供技术支持。本文以刮板输送机的可控启动装置CST中液黏传动的一对双圆弧油槽摩擦副间流场为研究对象,将摩擦片表面的双圆弧油槽和工作油的黏温特性考虑在内,对摩擦副间隙内的流场在纯油膜剪切阶段下的流场特性进行研究。通过建立在绝热边界下流场的简化数学模型,测量摩擦片和对偶钢片的尺寸,分析影响油液黏度变化的因素,试验测定液黏传动不同工作油的黏温特性,然后利用Pro/E软件建立流场的几何模型,使用ICEM CFD软件进行网格划分,接着导入ANSYS CFX软件中对其进行数值计算,获得不同转速差、不同入口流量、不同油膜厚度等工况条件下摩擦副间流场的流场特性和转矩特性,最后对结果进行研究分析。结果表明,在纯油膜剪切阶段,液黏传动流场的整体温升幅度不大,温度沿径向呈递增趋势,油槽区温度低于非油槽区,转速差和入口流量的变化对温度影响较大。流场压力沿径向方向整体呈线性递减趋势,周向压力与阶梯轴承周向压力分布类似整体呈周期性变化,转速差的变化对进出口压差影响较小,入口流量的变化对其影响较大。流场的流体流速沿径向呈周期性变化,但总体呈递增趋势,流体流线轨迹在非油槽区整体呈抛物线。油槽会降低油膜传递的转矩,转矩随动静摩擦副转速差增大而增大,入口流量对转矩影响很小,而油液的黏温特性会影响油膜传递的转矩。
[Abstract]:Scraper conveyor is one of the main equipment in coal mine fully mechanized mining face. Because of its different driving form, energy consumption and performance are different. With the features of stepless speed regulation, high efficiency and low impact, it is an effective technical means to realize energy saving and consumption reduction of mechanical transmission equipment. In the working process of CST fluid viscous transmission, The speed difference of the friction pair will cause viscous dissipation of the fluid in the gap due to internal friction, which will increase the temperature of the friction pair and the working oil, and reduce the output torque. Through the study of the flow field characteristics of the friction pair, it can provide the theoretical basis for the torque prediction of the clutch and analyze the influence of the temperature change of the flow field on the performance of the transmission. Then it provides technical support for the research of fluid viscosity transmission technology and the research and development of high power fluid viscosity transmission equipment. In this paper, the flow field between a pair of double circular arc oil groove friction pairs in CST, a controllable starting device of scraper conveyor, is taken as an object of study. Taking into account the viscosity and temperature characteristics of double arc oil grooves and working oils on the surface of friction plates, the flow field characteristics of friction pairs in the phase of pure oil film shear are studied. A simplified mathematical model of flow field under adiabatic boundary is established. Measuring the size of friction sheet and dual steel sheet, analyzing the factors that affect the viscosity change of oil, testing and measuring the viscosity and temperature characteristics of different working oil in fluid viscosity transmission, then using Pro/E software to establish the geometric model of flow field, and using ICEM CFD software to mesh. Then it is introduced into ANSYS CFX software for numerical calculation, and the flow field characteristics and torque characteristics of friction pairs under different operating conditions, such as different rotational speed difference, different inlet flow rate and different oil film thickness, are obtained. Finally, the results are analyzed. The results show that in the pure oil film shearing stage, the whole temperature rise range of fluid viscosity transmission flow field is not large, the temperature is increasing along radial direction, and the temperature of oil trough area is lower than that of non-oil tank area. The variation of rotational speed difference and inlet flow rate has a great influence on temperature. The pressure of flow field decreases linearly along the radial direction, and the distribution of circumferential pressure is similar to that of step bearing. The variation of rotational speed difference has little effect on the pressure difference between inlet and outlet, and the change of inlet flow rate has a great influence on it. The flow velocity of the flow field changes periodically along the radial direction, but it increases gradually. The flow line trajectory of the fluid is parabola in the non-oil tank area. The oil tank will reduce the torque of oil film transfer, and the torque increases with the increase of the rotational speed difference of the static and static friction pairs, and the inlet flow rate has little effect on the torque. The viscosity and temperature characteristics of oil affect the torque of oil film transfer.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD528.3

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