Research on Numerical Calculation for Aerodynamic Characteristics Analysis of Ducted Fan

涵道风扇气动特性影响因素数值计算研究

¹ School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China
² School of Astronautics and Aeronautics, Tsinghua University, Beijing 100084, China
³ Chinese Aeronautical Ratio and Electronics Research Institute, Shanghai 200233, China

Received: 20 January 2018

Abstract

By taking a typical ducted fan system model as the research object, the unsteady aerodynamics calculation method is established based on slide dynamic mesh technology. After the experimental validation of calculation method, the influence factors of viscous effect, tip clearance and propeller disk location are analyzed based on numerical calculation. The research results show that, the viscous effect embodies the boundary layer interactions between propeller tip and duct, and the calculation accuracy can be improved by considering viscous effect; the tip clearance determines the influence effect of propeller, and the decreasing of tip clearance leads to the increasing of duct thrust; the propeller disk location determines the flow quality and tip clearance, a reasonable location must bring the optimal fairing effect and ensures the tip clearance meeting the design requirements.

摘要

以某涵道风扇系统模型为研究对象，基于滑移动网格技术，建立了非定常气动力计算方法，并用风洞试验对其进行了验证分析。并在此基础上计算分析了影响涵道风扇系统气动特性的黏性效应、桨-涵道间隙以及桨盘位置等因素。结果表明，黏性效应代表了桨尖和涵道之间附面层干扰的大小，考虑黏性效应能够提高气动力计算的准确性；桨-涵道间隙决定了螺旋桨影响涵道的效果，间隙越小，影响越大，在涵道产生的附加拉力越大；桨盘位置则决定了进入螺旋桨的流场品质和桨-涵道间隙，合理的位置应保证涵道截面对气流的整流效果最佳且间隙符合设计要求。