航空弧齿锥齿轮风阻功率损失预测模型研究

Research on the Prediction Model of Wind Resistance Power Loss of Aerospace Spiral Bevel Gears

摘要:

随着航空弧齿锥齿轮的转速越来越高,由流体动力学行为引起的载荷无关风阻功率损失对传动效率影响越来越大,为了从理论上分析和预测风阻,从而更好的实现降阻目的；基于流体动力学基本原理,在流动边界条件和几何结构上做出相应假设,建立简化的弧齿锥齿轮风阻功率损失预测模型,过程中先建立圆盘的风阻损失预测模型,分别考虑层流流动和湍流流动以及圆盘圆周面流体流动产生的功率损失,再以此为基础建立旋转锥体的风阻损失预测模型,在一定的假设条件下讨论轮齿周围流体在齿轮旋转过程中的流动特性,最后建立弧齿锥齿轮风阻功率损失预测模型,经实例验证表明：该预测模型效果较好。

Abstract:

With the increasing rotational speed of aerospace spiral bevel gears, the load-independent wind resistance power loss caused by hydrodynamic behavior has an increasingly greater impact on the transmission efficiency. In order to theoretically analyze and predict the wind resistance, and thus better achieve the goal of reducing resistance, based on the basic principles of fluid dynamics, corresponding assumptions are made regarding the flow boundary conditions and geometric structure, and a simplified prediction model for the wind resistance power loss of spiral bevel gears is established. In the process, a prediction model for the wind resistance loss of a disk is first established. The power losses caused by laminar flow, turbulent flow, and the fluid flow on the circumferential surface of the disk are respectively considered. Then, based on this, a prediction model for the wind resistance loss of a rotating cone is established. Under certain assumptions, the flow characteristics of the fluid around the gear teeth during the rotation of the gear are discussed. Finally, a prediction model for the wind resistance power loss of spiral bevel gears is established, The verification through practical examples shows that the prediction model has a good effect.