实体膨胀管数值模拟及膨胀锥锥角优化设计

选择了一种实体膨胀管,对其不同锥角时的膨胀过程进行了详细的数值模拟,研究了膨胀锥锥角与膨胀压力、压力波动、膨胀后半径及轴向缩短量的关系,以期为膨胀锥的优化设计提供理论参考。建模时采用非线性有限元分析软件ABAQUS,膨胀锥为主面,膨胀管内壁为从面。结果表明,随着锥角的增大,膨胀压力和启动压力都逐渐增大,轴向缩短量随着锥角的增大而减小,锥角为15°时膨胀管轴向缩短量约为总膨胀长度的1.7%,综合膨胀压力、膨胀后半径及压力波动,比较理想的膨胀锥锥角为15～17°以及22°。

Numerical simulation of the solid expansion pipe and optimized design of the expansion cone angle

A kind of solid expansion pipe was chosen, its expansion process under different cone angles was numerically simulated in detail, and the relationship between the expansion cone angle and the expansion pressure, pressure fluctuation, after-expansion radius and axial shortening amount is investigated, in the hope of providing a theoretical reference to the optimized design of expansion cone. In modeling, the nonlinear finite element software named ABAQUS was adopted, with the expansion cone as the main plane and the inner wall of the cone as the slave surface. The result shows that with the increase of the cone angle, both the expansion pressure and start-up pressure increase gradually while the axial shortening amount decreases with the increase of the cone angle. When the cone angle is 15°, the axial shortening amount of the expansion pipe is approximately 1.7% of the total expansion length. Considering the expansion pressure, after-expansion radius and pressure fluctuation, the relatively ideal expansion cone angle is 15～17°and 22°.