采用多介质弹塑性流体动力学计算方法,研制了适用于复杂加载的Lagrange计算程序MLEP,对劳伦斯利弗莫尔国家实验室(Lawrence Livermore National Laboratory,LLNL)19层和冲击波物理与爆轰物理国防科技重点实验室(Laboratory of Shock Wav...采用多介质弹塑性流体动力学计算方法,研制了适用于复杂加载的Lagrange计算程序MLEP,对劳伦斯利弗莫尔国家实验室(Lawrence Livermore National Laboratory,LLNL)19层和冲击波物理与爆轰物理国防科技重点实验室(Laboratory of Shock Wave andDetonation Physics,LSD)设计的29层Mg-Cu体系Pillow密度梯度飞片气炮加载实验过程进行了数值模拟和比较,获得的速度剖面计算结果与实验测试结果吻合一致,验证了流体动力学计算方法、不同材料体系混合模型以及计算程序的有效性和实用性,为进一步开展可控路径的复杂加载实验研究奠定了基础。展开更多
Air cannon is a kind of de-clogging device which produces impulse force by instantly releasing the compressed air deposited in a pressure vessel. Air cannons are widely used in the transport pipes of warehouses, docks...Air cannon is a kind of de-clogging device which produces impulse force by instantly releasing the compressed air deposited in a pressure vessel. Air cannons are widely used in the transport pipes of warehouses, docks, furnaces and coal mines. In this paper, the theoretical analysis with isentropic flow hypothesis is firstly conducted on a simplified mode/ to deduce the theo- retical maximum of impulse force. And numerical study is carried out to predict the steady and unsteady impulse forces via simulating the whole exhausting process of the air cannon. The results demonstrate that the impulse force can be improved via increasing the piston sleeve inlet length and increasing the nozzle diameter. Laval nozzle can also increase the impulse force of the air without increasing the air mass flow. The optimization of the air cannon is then conducted on the basis of the theoretical and numerical analyses. Experimental measurements indicate that the computations well simulate the working process of the air cannon and the impulse force of the optimized design is 50% higher than the original model. For the cases with working pressure of 0.8 MPa, the optimized design is 60% higher than the original one.展开更多
文摘采用多介质弹塑性流体动力学计算方法,研制了适用于复杂加载的Lagrange计算程序MLEP,对劳伦斯利弗莫尔国家实验室(Lawrence Livermore National Laboratory,LLNL)19层和冲击波物理与爆轰物理国防科技重点实验室(Laboratory of Shock Wave andDetonation Physics,LSD)设计的29层Mg-Cu体系Pillow密度梯度飞片气炮加载实验过程进行了数值模拟和比较,获得的速度剖面计算结果与实验测试结果吻合一致,验证了流体动力学计算方法、不同材料体系混合模型以及计算程序的有效性和实用性,为进一步开展可控路径的复杂加载实验研究奠定了基础。
基金supported by the National Nature Science Foundation of China(Grant No.50906079)the 100 Talents Program of Chinese Academy of Sciences
文摘Air cannon is a kind of de-clogging device which produces impulse force by instantly releasing the compressed air deposited in a pressure vessel. Air cannons are widely used in the transport pipes of warehouses, docks, furnaces and coal mines. In this paper, the theoretical analysis with isentropic flow hypothesis is firstly conducted on a simplified mode/ to deduce the theo- retical maximum of impulse force. And numerical study is carried out to predict the steady and unsteady impulse forces via simulating the whole exhausting process of the air cannon. The results demonstrate that the impulse force can be improved via increasing the piston sleeve inlet length and increasing the nozzle diameter. Laval nozzle can also increase the impulse force of the air without increasing the air mass flow. The optimization of the air cannon is then conducted on the basis of the theoretical and numerical analyses. Experimental measurements indicate that the computations well simulate the working process of the air cannon and the impulse force of the optimized design is 50% higher than the original model. For the cases with working pressure of 0.8 MPa, the optimized design is 60% higher than the original one.
