二维翼型节能减阻效果的研究

Two-dimensional Airfoils Drag Reduction Energy-saving Effect Research

就现阶段国内外研究成果分析,肋片具有减小摩擦阻力及增加流动扰动等特点。平板上采用肋片减阻的效果及肋片参数对减阻的影响已相对清晰,而二维翼型上采用加装肋片后减阻效果如何变化还未可知。文章选取二维翼型S825并使用计算流体力学软件Fluent进行气动性能计算及性能分析,初步发现翼型的表面减阻效果的影响规律,得到升、阻力系数随攻角的变化关系。并用该软件计算带肋片的二维翼型的气动性能,与无肋片的翼型气动性能进行对比分析。结果显示:肋片结构在翼型表面可以产生一定的减阻效果;总阻力的计算公式为压差阻力与粘性阻力之和。由于二维翼型上加装了肋片,改变了压差阻力和粘性阻力,继而改变了总阻力的数值,产生了很好的减阻效果。

It is known that fin has the characters of reducing friction and increasing disturbance of flow. The effect of using fins to reduce friction and the influence of fin Parameters on reducing friction have been rela- tively clear, while the use of 2D airfoil＇ s effect has been unknown. The possibility of using fins on airfoil will be discussed in this article through Flow field simulation of 2D airfoil with fins. To the given 2D airfoil s825, Using the computational fluid dynamics software Fluent, calculation of aerodynamic performance and Perfor- mance Analysis has been performed. The law of surface drag reduction effects has initially been found and the variation of lift and drag coefficient with angle of attack has been achieved. In addition, using the soft- ware to calculate the aerodynamic performance of 2D airfoil, and taking a comparative analysis with the aero- dynamic performance of airfoil without fins. Ultimately it can be concluded： Fin structure in the airfoil sur- face can produce some drag reduction effect. The formula for calculating the total drag is the sum of pressure drag and viscous drag. Since the installation of fms on a two-dimensional airfoil, the pressure drag and vis- cous drag are changed, then changing the value of the total drag. The f＇mial effect is to produce a good drag re- duction