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采用二阶正格式方法对超声速轴对称喷流流动进行数值模拟。将二维守恒方程的正格式方法发展到轴对称Euler方程组的求解,并对导弹尾部超声速伴随射流进行了数值计算。数值结果与实验照片所反映的流动特征吻合较好,与三阶精度间断有限元方法计算结果吻合,相比于二阶高分辨率TVD格式的计算结果,正格式方法的计算结果在间断点处具有较大的梯度变化。这表明该方法对激波具有较强的捕捉能力,在间断处不会出现数值振荡,对弹尾声音速伴随射流的数值模拟真实、有效。
The second order positive format method is used to simulate the supersonic axial symmetrical jet flow. The positive method of two-dimensional conservation equation was developed to the solution of the axially symmetric Euler equations, and the supersonic supersonic jets in the tail of the missile were numerically calculated. The numerical results are in good agreement with the flow characteristics reflected in the experimental photographs, which are in good agreement with the third-order discontinuity finite element method. Comparing with the second-order high resolution TVD method, Has a large gradient changes. It shows that this method has a strong ability to capture shock waves and does not oscillate numerically at break. The numerical simulation of the velocity of the projectile accompanying jet is real and effective.