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首页> 外文期刊>Journal of Mechanical Science and Technology >Effects of SJA boundary conditions on predicting the aerodynamic behavior of NACA 0015 airfoil in separated condition
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Effects of SJA boundary conditions on predicting the aerodynamic behavior of NACA 0015 airfoil in separated condition

机译：SJA边界条件对分离条件下NACA 0015机翼空气动力学行为的预测的影响

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摘要

Synthetic jet actuators (SJAs) are popular active-flow control devices. Hence, they have been widely investigated through computational fluid dynamics (CFD) simulations and experiments. Although such simulations are faster, cheaper, and more popular than experiments, the simulation results of similar geometries often differ from one another. A reason for the differences between CFD results is the simplification of CFD models. To determine the influence level of SJA simplifications on the aerodynamics of an airfoil under a separated condition, this study compares the most complicated assumption for SJA simulation with the simplest one. A NACA 0015 airfoil is simulated at an angle of attack of 16.6 degrees and a Reynolds number of 896000. Two different methods are applied to simulate SJA, namely, morphing mesh (MM) technique for piston movement and oscillatory inlet velocity (OIV) at the jet-exit location. Results reveal that the mean lift value of the MM case is only 3% less than that of the OIV case. However, the drag forces of MM case are approximately 15% higher than those of the OIV case. In addition, the vortex structures in the OIV case are smaller than those in the MM case. Finally, the cycle-averaged streamlines of the two models are similar near the trailing edge, but they differ in the vicinity of the SJA exit location.
机译：合成射流执行器（SJA）是流行的主动流量控制设备。因此，它们已通过计算流体动力学（CFD）模拟和实验得到了广泛研究。尽管这种仿真比实验更快，更便宜并且更受欢迎，但是相似几何结构的仿真结果常常彼此不同。 CFD结果之间差异的原因是CFD模型的简化。为了确定SJA简化对分离条件下机翼空气动力学的影响程度，本研究将最复杂的SJA假设与最简单的假设进行了比较。模拟NACA 0015机翼的迎角为16.6度，雷诺数为896000。采用两种不同的方法来模拟SJA，即用于活塞运动的变形网格（MM）技术和在进气口处的振荡进气速度（OIV）。飞机出口位置。结果显示，MM案例的平均提升值仅比OIV案例低3％。但是，MM情况的阻力比OIV情况的阻力高约15％。另外，OIV情况下的涡流结构比MM情况下的涡流结构小。最后，两个模型的周期平均流线在后缘附近相似，但在SJA出口位置附近不同。

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