多级环量控制技术增升机理及能效分析

Abstract

Abstract:

Aiming at the weaknesses of low aerodynamic efficiency and high energy consumption of single-stage circulation control， we design a multistage circulation lift wing. Through the force measurement experiment， the control effect of the multistage circulation control in the aspect of lift increase is comparatively studied， and the influence of the blow coefficient on the aerodynamic performance of the wing is examined based on the multistage circulation control. The flow control mechanism before and after the critical blowing coefficient is studied by a Particle Image Velocimetry （PIV） experiment. The force measurement results show that the maximum lift-to-drag ratio of three slot blowing （multistage circulation control） is improved by 95.3% compared with that of non-circulation control with the input flow Q=9.84 m³/h. With the increase of the blowing coefficient， the circulation control undergoes two stages： separation control and super circulation control. In the separation control stage， the lift coefficient increases significantly with the increase of the blowing coefficient， while the drag coefficient decreases first and then increases. In the super circulation control stage， the increase of the blowing coefficient leads to the weakening of the lifting effect of the lift coefficient， while the drag coefficient gradually increases and finally flattens out. The PIV results show that， in the separation control stage， with the increase of the blowing coefficient， the jet separation point moves down along the back edge of the arc， increasing the velocity circulation to improve the lift， and the wake area decreases and the velocity increases to reduce the drag. In the super circulation control stage， the high-speed jet causes the trailing edge streamlines to produce large deflection curvature， functioning as a pneumatic flap， exhibiting the effect of controlling flow separation at high angles of attack. In addition， the concept of effective lift-to-drag ratio is introduced to evaluate the aerodynamic efficiency of the multistage circulation control wing. It is found that the power coefficient of the multistage circulation control wing is small， the effective lift-to-drag ratio is the largest， and the aerodynamic efficiency the highest in the separation control stage.

Key words: circulation control, lift enhancement, Coanda effect, wind tunnel experiments, Particle Image Velocimetry (PIV)

CLC Number:

V211.4

Hai DU, Lejie YANG, Zheng LI, Yue XU, Jingyang SUN, Yuhang WANG. Lifting mechanism and energy efficiency analysis of multistage circulation control technology[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(S2): 54-66.

Figures/Tables 15

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References 24

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参数	设计载荷	精确度/%	准确度/%
X	5/kg	0.18	0.48
Y	2/kg	0.2	0.31
Z	5/kg	0.2	0.5
M_X	1/（kg·m）	0.1	0.27
M_Y	1/（kg·m）	0.085	0.30
M_Z	1/（kg·m）	0.19	0.42

试验条件	喷口	总流量/ （m³·h^-1）	各喷口流量/ （m³·h^-1）
单喷口吹气试验	Slot1	9.84	9.84
	Slot2
	Slot3
双喷口吹气试验	Slot1	9.84	4.92
	Slot2		4.92
	Slot3
三喷口吹气试验	Slot1	9.84	3.28
	Slot2		3.28
	Slot3		3.28

总流量Q/（m³·h ^-¹）	Q_Slot1=Q_Slot2=Q_Slot3	C_μ-_Slot1=C_μ-_Slot2=C_μ-_Slot3
0	0	0
14.76	4.92	0.01
20.85	6.95	0.02
25.56	8.52	0.03
29.52	9.84	0.04
33.01	11.01	0.05
41.73	13.92	0.08
46.68	15.56	0.1

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Lifting mechanism and energy efficiency analysis of multistage circulation control technology

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