CAJ | 학술논문

为更加精确地描述宽范围内均匀自由场中球形装药爆炸过程的特性，采用球形非等温爆炸模型，考虑装药爆炸近区高温高压条件下真实空气的特殊性质，引入真实空气量纲一拟合状态方程和J WL爆轰产物状态方程，建立拉格朗日球形坐标系下完备的量纲一流体动力学方程组；采用对点源强爆炸自模拟数值解的结果进行样条插值作为初始条件，将人工黏性法与激波装配法相结合，采用显式中心差分格式进行数值求解。通过算例计算，得到冲击波不同时刻的波形曲线和主激波峰值超压衰减曲线，通过拟合得到宽范围内的主激波峰值超压计算公式，计算值与有关文献以及实验较为吻合，验证了公式的准确性。结果表明，采用真实空气状态方程得到的结果适用于描述装药空中爆炸近区和远区流场特性。
위경가정학지묘술관범위내균균자유장중구형장약폭작과정적특성，채용구형비등온폭작모형，고필장약폭작근구고온고압조건하진실공기적특수성질，인입진실공기량강일의합상태방정화J WL폭굉산물상태방정，건립랍격랑일구형좌표계하완비적량강일류체동역학방정조；채용대점원강폭작자모의수치해적결과진행양조삽치작위초시조건，장인공점성법여격파장배법상결합，채용현식중심차분격식진행수치구해。통과산례계산，득도충격파불동시각적파형곡선화주격파봉치초압쇠감곡선，통과의합득도관범위내적주격파봉치초압계산공식，계산치여유관문헌이급실험교위문합，험증료공식적준학성。결과표명，채용진실공기상태방정득도적결과괄용우묘술장약공중폭작근구화원구류장특성。
A spherical non-isothermal blasting model was used to describe the characteristics of spherical charge blasting in uniform free field in wide range more accurately.Considering the special characteristics of real air in the near field of charge blasting under high temperature and high pressure,the fitted dimen-sionless equation of state of real air and the JWL(Jones-Wilkins-Lee)equation were used to construct the complete dimensionless hydrodynamic equations in Lagrangian spherical coordinate system.The interpola-tion calculation of the results of numerical solutions of intense explosions was used as the initial conditions. Combined the artificial viscosity technique with the fitting technique,the explicit scheme was used to solve the particle difference equations.By calculating,the wave profiles at different time and the attenuation curve of peak overpressure for TNT charge blasting in air were presented.A fitting equation for calculating the peak overpressure of mail shock wave within a wide distance range of charge blasting was obtained,and the results were compared with other available data to verify the validity of the presented equation.The applicabili-ty of the presented method in describing the near and far fields of charge blasting in air is demonstrated.