中等展弦比飞翼布局无人机后缘射流滚转控制

doi:10.7572/S1000-6893.2022.27437

Abstract

Abstract:

With jet active flow control technologies， the flying-wing aircraft are expected to achieve flapless flight which can improve the stealth characteristics. However， little research has been done on the tactical flying-wing platforms with a medium aspect ratio （3-4）. We design a Circulation Control Effector （CCE） to replace the ailerons of a medium-aspect-ratio flying-wing UCAV. Numerical simulations and flight tests of the demonstrator are conducted to investigate the roll control effectiveness of the trailing-edge circulation control jet. In numerical simulations， the pressure inlet boundary is adopted， and the contribution of the jet momentum is also considered in the aerodynamic force calculation. Then， the coupling simulation of the inner flow in the CCE and the outer flow over the flying-wing UCAV is realized， and the aerodynamic characteristics of the demonstrator are predicted. The simulation results show that with the increase of the jet momentum coefficient， the roll control capability increases almost linearly， with no obvious coupling yaw moment or pitch moment. The flight test results indicate that remarkable roll control effectiveness is achieved by the CCE， with the mean roll rate being 25.5-26.7 （°）/s， the maximum roll rate 40.1 （°）/s， and the maximum roll angle 83.9°.

Key words: active flow control, circulation control, flying-wing aircraft, roll control, flight test

CLC Number:

V212.1

Shuai SHAO, Zheng GUO, Gaowei JIA, Qingyang CHEN, Zhongxi HOU, Laiping ZHANG. Roll control of medium-aspect-ratio flying-wing UCAV based on trailing-edge jet[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(10): 127437.

Figures/Tables 20

Fig. 1

Table 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Table 2

Jet velocity uj of CCE vs PWM value of centrifugal fan control signal

PWM/ms	$u j$ /（m·s^-1）
1.19	11.90
1.27	29.47
1.35	47.88
1.442	62.49
1.48	70.77

Table 2

Fig. 7

Table 3

NPRand Cμ at specific jet velocities uj

$u j$ /（m·s^-1）	NPR	$C μ$
11.90	1.002	5.43×10^-5
29.47	1.010 7	3.19×10^-4
47.88	1.03	9.79×10^-4
62.49	1.04	1.33×10^-3
70.77	1.045	1.51×10^-3

Table 3

Fig. 8

Fig. 9

Fig. 10

Fig. 11

Fig. 12

Fig. 13

Fig. 14

Fig. 15

Table 4

Table 5

References 24

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参数	粗网格	中等网格	密网格
第1层网格厚度/m	1×10^-5	5×10^-6	2×10^-6
加密区平均尺度/m	0.08	0.05	0.04
单元数量	3.28×10⁶	8.87×10⁶	1.86×10⁷
C_L	-1.02×10^-2	-1.01×10^-2	-1.02×10^-2
C_D	8.14×10^-3	7.64×10^-3	7.57×10^-3
C_m	4.06×10^-3	4.13×10^-3	4.17×10^-3

参数	Jet-1	Jet-2	Jet-3
时间窗口/s	149.0~150.1	171.1~173.6	197.6~199.8
平均滚转角速率/（（°）·s^-1）	25.5	26.7	26.7
最大滚转角速率/（（°）·s^-1）	38.4	35	40.1
最大滚转角/（°）	59.5	83.9	69.1

算例	布局	后掠角/（°）	展弦比	最大滚转角速率/（（°）·s^-1）
Ref-1^［9］	平直翼	0	6.3	27.2
Ref-2^［24］	平直翼	4.1	7.9	15.62
Ref-3^［12］	飞翼	30	5.3	49.6
本文	飞翼	53	3.1	40.1

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Roll control of medium-aspect-ratio flying-wing UCAV based on trailing-edge jet

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