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为研究复合材料定向管热弹性问题,采用求解轴对称流动Euler方程组的正格式方法对管内火箭燃气射流场进行数值模拟,得到了管内流场热力载荷。运用非线性有限元方法,建立了复合材料定向管非线性热弹性有限元模型,将定向管模态计算结果与模态试验结果作比较,验证了有限元模型的有效性,计算了复合材料定向管分别在火箭燃气动压载荷、非定常温度场和耦合状态下的动力学响应。结果表明:由非定常温度场热冲击引起的定向管内壁面热应力响应呈现脉冲形状,轴向应力对复合材料定向管定位部间管段的应力响应影响较径向应力和周向应力明显,热冲击引起的热应力在复合材料定向管的热弹性应力响应中占主导作用。
In order to study the thermoelasticity of the oriented tube, the positive gas flow of the rocket gas jet in the tube was numerically simulated by the positive method to solve the axially symmetric Euler equations. The thermal load on the flow field in the tube was obtained. The nonlinear finite element method is used to establish the nonlinear thermo-elastic finite element model of the oriented tube of composite material. Comparing the result of the modal test of the directional tube with the result of the modal test, the validity of the finite element model is verified and the composite material orientation The dynamic response of the tube under the dynamic pressure of rocket gas, the unsteady temperature field and the coupling state respectively. The results show that the thermal stress response of the inner wall of the directional tube caused by the unsteady temperature field has a pulse shape. The axial stress exerts a greater influence on the stress response of the section of the composite tube than the radial and circumferential stresses. The resulting thermal stress dominates the thermo-elastic stress response of the composite oriented tube.