基于离散协同射流的翼型增升减阻方法

协同射流是一种近壁面流动的高效、低能耗主动控制技术。重点开展了一种应用离散协同射流的二维翼型增升减阻效应的数值模拟研究,分析了离散协同射流的堵塞度和喷口密集度等关键参数对流场结构、气动特性、功率消耗及能量利用率的影响效应与作用规律。在施加离散协同射流措施后,能够使翼型近壁面空间流场更有效地产生较强的相干涡结构,使得射流与主流及边界层充分混合,可显著提高同等迎角下的升力系数、明显减小阻力系数,最大升力系数提高近150%,失速攻角推迟约5°。研究表明:离散协同射流是一种显著提高翼型性能的高效流动控制方法。

Discrete Co-Flow Jet Technology for Airfoil Lift Enhancement and Drag Reduction

Co-Flow Jet（ CFJ） is an efficient and low energy consumption technology of flow control used near wall .The work deals mainly with lift enhancement and drag reduction of airfoil using discrete CFJ （ DCFJ） by numerical simulation .Simulations for key parameters ,such as obstruction and number of jets , are carried out for the flow structure ,aerodynamic performance, power consumption ,energy efficiency .Re-sults indicate that a DCFJ airfoil will generate both streamwise and spanwise vortex structures to mix the high speed jet with main flow and boundary layer thoroughly .Airfoil using DCFJ can increase lift at the same angle of attack ,reduce aerodynamic drag significantly ,achieve up to a 150%increase of maximum lift and delay about 5 °of the angle of stall .The study indicates that DCFJ is a very effective and low ener-gy expenditure flow control technology for airfoil performance enhancement .