Abstract
The Roe format and LU-SGS method are used to discretize the NS equation, and the second-order precision unilateral differential discrete rigid body dynamic equations are coupled to solve the NS equation and the rigid body dynamics equations at Ma=0.2, and numerically simulate the 80°swept delta wing. In the rock history under different leading edge shapes, the influence of the leading edge shape on the rock characteristics of the delta wing is studied. The calculation model consists of three different leading edge shape delta wings with a lower sharpened, a sharpened tip and a double-sided sharpened tip. The results show that the shape of the leading edge significantly affects the bifurcation and amplitude characteristics of the delta wing rock. The taper angle of attack of the lower sharpened leading edge delta wing is the largest, and the splitting angle of the upper sharpened leading edge delta wing is the smallest. When the angle of attack is 25°, all three wings form equal-amplitude oscillations in the form of limit cycles. The amplitude of the lower sharpening leading edge delta wing is the smallest, and the amplitude of the upper sharpening leading edge delta wing is the largest; when the angle of attack increases At 30°, the three wings eventually form a constant-amplitude oscillation in the form of a limit ring, but the double-sided sharpened, upper-curved leading edge delta wing will flip and the other side will swing in equal amplitude.
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