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翼型厚度对水动力特性影响的数值模拟分析

19    2020-05-27

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作者:李淑江, 张育辉, 窦如宏

作者单位:青岛科技大学机电工程学院, 山东 青岛 266061


关键词:水动力特性;翼型厚度;数值模拟;CFD


摘要:

为探索水力机械不同厚度非对称翼型水动力特性的变化规律,通过CFD软件基于RNG k-ε湍流模型以NACA 65-206、NACA 65-210两种非对称翼型为研究对象进行水动力特性数值模拟计算,对比分析两种翼型在来流速度为2 m/s的工况以及翼型攻角(攻角定义为来流速度方向与翼型弦线之间的夹角)介于-10°~35°范围内的流动特性变化,通过计算得到翼型的阻力、升力,并绘制升阻比值曲线图,结合速度等值线图和压力云图分析翼型厚度对升力特性、阻力特性、升阻比特性以及翼型失速等水动力性能与攻角变化的关系。对比得出,增大翼型厚度有助于扩宽升阻比所对应的攻角范围,并且两翼型的升阻比特性与翼型的绕流特性具有明显差异。结果有益于了解水力机械叶片翼型的水动力特性,可为水力机械叶轮叶片翼型的设计提供理论依据。


Numerical simulation analysis of influence for airfoilthickness on hydrodynamic characteristics
LI Shujiang, ZHANG Yuhui, DOU Ruhong
School of Mechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
Abstract: In order to explore the variation of hydrodynamic characteristics of asymmetric airfoils with different thicknesses in hydromechanical machines. Based on the RNG k-ε turbulence model by CFD software, numerical simulation calculations of hydrodynamic characteristics are performed using two types of asymmetric airfoils NACA 65-206 and NACA 65-210. The flow characteristics of the two airfoils under the condition of the inlet velocity of 2 m/s and the angle of attack (the angle of attack is defined as the angle between the direction of velocity and the airfoil string) of the airfoils between -10° and 35° are compared and analyzed. The drag and lift force of the airfoil were calculated, and the lift and drag ratio curve was drawn. The relationship between the aerodynamic characteristics of airfoil thickness and the change of the angle of attack, such as lift characteristic, drag characteristic, lift-to-drag ratio characteristic, airfoil stall speed and so on, is analyzed by combining the velocity contour diagram and pressure cloud diagram. The comparison shows that increasing the thickness of the airfoil is helpful to widen the range of attack angles corresponding to the lift-to-drag ratio, and the lift-drag characteristic of the two airfoils is significantly different from the airflow around the airfoil. The results are helpful for understanding the hydrodynamic characteristics of hydromechanical blade airfoil, and it can provide a theoretical basis for the design of hydromechanical blade airfoil.
Keywords: hydrodynamic characteristics;airfoil thickness;numerical simulation;CFD
2020, 46(5):148-153  收稿日期: 2019-07-21;收到修改稿日期: 2019-08-27
基金项目:
作者简介: 李淑江(1976-),男,山东临沂市人,副教授,博士,主要从事游艇设计及人机交互研究
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