Correction: High Efficiency Tandem Propeller-CoFlow Jet Airfoil System in Cruise
Correction: High Efficiency Tandem Propeller-CoFlow Jet Airfoil System in Cruise
复制标题
修正：巡航中的高效串联螺旋桨-CoFlow 喷射翼型系统
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Gecheng Zha
中科院分区：
文献类型：
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作者：
Yan Ren;Yang Wang;Gecheng Zha
本文对二维串联式螺旋桨- coflow Jet （CFJ）主动流控翼型在巡航飞行中的气动性能进行了数值研究。串联螺旋桨-CFJ翼型系统是上游和下游CFJ翼型的集成系统，每个都有一个螺旋桨安装在翼型吸力面以上。模拟采用Spalart-Allmaras （S-A）湍流模型的三维RANS求解器，非粘流采用三阶WENO格式，粘流项采用二阶中心差分格式。对不同下游翼型位置和迎角的串联翼系统的气动性能、能量消耗和流场进行了比较。结果表明，巡航效率对下游翼型迎角敏感。此外，通过将最佳串列螺旋桨- cfj翼型系统与仅上游翼型和下游翼型（无相互作用）进行比较，研究了翼-翼相互作用对气动性能的影响。观察到翼翼相互作用由于螺旋桨的激流而显著提高了巡航效率。前螺旋桨有一个“推动”的效果，加速流向下游翼型。下游的螺旋桨有“拉动”作用，加速上游的流动。下游翼型与较高的迎角也诱导了一个上冲和较高的循环到上游翼型。在这篇论文中观察到的最佳串联翼型相互作用的好处似乎是归因于两个翼型的接近，这是只有一个弦离水平与后方翼型0.1弦低于前面一个。本文的研究对串联式机翼的螺旋桨相互作用具有一定的指导意义。然而，它没有考虑到三维串联翼系统的尖端涡和下洗的重要影响。
In this paper, the aerodynamic performance of 2D tandem propeller-CoFlow Jet (CFJ) active flow control airfoils in cruise flight is numerically studied. The tandem propeller-CFJ airfoil system is an integrated system with upstream and downstream CFJ airfoils, each has a propeller mounted above the airfoil suction surface. The simulations employ 3D RANS solver with Spalart-Allmaras (S-A) turbulence model, 3rd order WENO scheme for the inviscid fluxes, and 2nd order central differencing for the viscous terms. The aerodynamic performance, energy expenditure, and flow field are compared between tandem wing systems with different downstream airfoil locations and angle of attack. The results show that the cruise efficiency is sensitive to the downstream airfoil angle of attack. Moreover, The wing-wing interaction effect on the aerodynamic performance is studied by comparing the optimum tandem propeller-CFJ airfoil system to the upstream airfoil and downstream airfoil only (without interaction) cases. It is observed that the wing-wing interaction increases the cruise efficiency significantly due to the energized flow of the propellers. The front propeller has a ”pushing” effect accelerating the flow to the downstream airfoil. The downstream propeller has a ”pulling” effect to accelerate the upstream flow. The downstream airfoil with higher angle of attack also induces an upwash and a higher circulation to the upstream airfoil. The optimal tandem airfoil interaction benefit observed in this paper appears to be attributed the proximity of the two airfoils, which are only one chord away horizontally with the rear airfoil 0.1 chord below the front one. This study may provide some guidance on the propeller interaction of a tandem wing. However, it does not include the important effect of the tip vortices and downwash of a 3D tandem wing system.