小展弦比飞翼标模非定常流动及自由摇滚特性

doi:10.7527/S1000-6893.2021.26449

Abstract

Abstract:

The low aspect ratio flying-wing layout is one of the options of new fighter aircraft， and its dynamic characteristics are particularly important. Aiming at the unsteady flow and wing rock of the low aspect ratio flying-wing standard model at a large angle of attack， we employ the Delay Detached Eddy Simulation （DDES） method and the Dynamic Modal Decomposition （DMD） method to study the unsteady flow， fluctuating pressure and wing rock characteristics of flying-wings. The instability mechanism is analyzed and the method of instability motion control is explored. The results show that the unsteady flow characteristics （Ma=0.6）of the flying-wing model at a large angle of attack are mainly reflected in the concentrated vortex， vortex breakdown， and spiral wave. The vortex breakdown point oscillates along the vortex axis at the frequency of St=0.12-0.23， and the spiral wave frequency is within the range of St=1.16-2.33. The wing rock characteristics of the flying-wing model obtained through numerical simulation are in good agreement with those of the wind tunnel test. The wing rock phenomenon appears at the angle of attack of 24.5°-26°， and the roll angle balance position is 28°. It is found that the balance between concentrated vortex flow on the leeward side and separated flow on the windward side is the physical mechanism for the occurrence and maintenance of wing rock. When the upper spoiler is opened for 30°， the control effect of wing rock is not obvious. When the outer aileron is deflected for 30° downward， the wing rock phenomenon can be well restrained.

Key words: flying-wing, unsteady flow, wing rock, instability of control, subsonic, Delay Detached Eddy Simulation (DDES)

CLC Number:

V211.3

Fangjian WANG, Ke XIE, Jin LIU, Yuhui SONG, Han QIN, Lan CHEN. Unsteady flow and wing rock characteristics of low aspect ratio flying-wing[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(4): 126449-126449.

Figures/Tables 36

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网格量/10⁴	C_L	C_D	C_m
750	1.11	0.485	0.096
1 500	1.04	0.470	0.080
3 000	1.03	0.465	0.084

方法	阶数	a	b	c	d	e
FDF1	1	1	0	0	1	0
BDF1	1	1	0	1	0	0
FDF2	2	1	0	0	3/2	-1/2
BDF2	2	4/3	-1/3	2/3	0	0
C-N	2	1	0	1/2	1/2	0
A-M3	3	1	0	5/12	8/12	-1/12

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Unsteady flow and wing rock characteristics of low aspect ratio flying-wing

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