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在两种双锥罩的基础上,设计4种变壁厚和等壁厚相结合的复合双锥药型罩。应用LS-DYNA3D有限元程序,采用ALE方法对复合药型罩的小锥角聚能装药,在5种不同上下罩高比例的情况下射流形成过程进行数值模拟。结果表明:采用罩壁外母线为直线、上锥罩为等壁厚和下锥罩为变壁厚相结合的复合药型罩,射流速度梯度高于两种双锥罩和其他3种复合药型罩,且当上下罩高比例为5/5时,射流头部速度达到最大,为7 174 m/s;4种复合药型罩在上下罩高比例为7/3时,均出现射流较短并且射流中段较早发生失稳断裂的情况。
Based on the two kinds of double-cone covers, four kinds of double-cone coverings with different wall thickness and wall thickness are designed. The LS-DYNA3D finite element program was used to simulate the formation of jet with five different upper and lower hoods with ALE method. The results show that the outer wall of the cover is a straight line, the upper cone cover is a compound type cover with a combination of wall thickness and variable thickness of the lower cone cover, and the jet velocity gradient is higher than that of the two double cone covers and the other three compound drug types When the ratio of upper and lower hoods was 5/5, the jet head velocity reached the maximum, which was 7 174 m / s. When the four kinds of composite medicine hoods had a high ratio of upper and lower hoods of 7/3, the jet jets were short And the middle section of the jet instability fracture occurred earlier.