Numerical investigation of aerodynamic characteristics of a flying wing aircraft controlled by reverse dual synthetic jets
Numerical investigation of aerodynamic characteristics of a flying wing aircraft controlled by reverse dual synthetic jets
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DOI：
10.1063/5.0141784
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发表时间：
2023-05
影响因子：
4.6
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中科院分区：
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为了探索反向双合成射流（RDSJs）在飞翼飞机（FWA）中的控制潜力，将反向双合成射流作动器（RDSJAs）集成到具有滚柱和拖缆混合流动模式的FWA中。利用数值模拟方法研究了气动特性和控制机理。结果表明，气动载荷随攻角的增大呈非线性变化，整个过程可分为三个阶段。在第一级（AOA = 0° ~ 8 °），RDSJ可以改善反向压力梯度，形成交替回流区甚至大面积分离区。压力在出口前升高，出口后福尔斯降低，导致Cd升高，CL降低。前缘吸力和压力包线面积的减小导致随着AOA的增大而进一步增大，从而导致ΔCL减小和ΔCd改善。在第二阶段（AOA = 8° ~ 24 °），RDSJs的能量很低，不足以在背风面形成强扰动，而下垫面沿着有利的气压梯度的促进会削弱RDSJAs的控制作用，使气压包线变窄。随着Cd的下降，前缘涡减弱，ΔCL增大。在第三级（AOA = 24°-32°），RDSJ与较大的分离区相互作用，能够加速机翼上的流动，通过增稳提高LEV的纵向速度，改善LEV的强度和稳定性。加速流在RDSJA后面产生负压，导致压力包络面积的递减进一步减小。在上述因素的影响下，CL和Cd均出现增强。
In this work, to explore the control potential of reverse dual synthetic jets (RDSJs) in a flying wing aircraft (FWA), reverse dual synthetic jet actuators (RDSJAs) are integrated into a FWA with a hybrid flow mode of rollers and streamers. The aerodynamic characteristics and control mechanism are investigated using numerical simulations. The results show that the aerodynamic loads follow a nonlinear trend, and the overall process can be divided into three stages with an increasing angle of attack (AOA). In the first stage (AOA = 0°–8°), the RDSJs can improve the reverse pressure gradients and form alternate recirculation zones or even a large-area separation. The pressure rises before and falls after the exits, causing an increase in Cd and a drop in CL. The decrease in the leading-edge suction and the pressure envelope area results in a further increase with the increasing AOA, resulting in a reduction in ΔCL and an improvement in ΔCd. In the second stage (AOA = 8°–24°), the energy of the RDSJs is too low to form a strong disturbance over the leeward surface, and the promotion of favorable pressure gradients along the lower surface can weaken the control effects of the RDSJAs, causing a decrease in the narrowing degree of the pressure envelope. The leading-edge vortex (LEV) is weakened, and ΔCL increases as Cd experiences a drop. In the third stage (AOA = 24°–32°), the RDSJs interact with the larger separation and are capable of accelerating the flow over the wing section, elevating the longitudinal velocity of the LEV through entrainments and improving the strength and stability of the LEV. The accelerated flow creates negative pressures behind RDSJAs, causing a further reduction in the decrement of the pressure envelope area. An enhancement of CL and Cd appears under the influence of the above factors.