大口径过滤器骨架结构稳定性计算与试验研究

Calculation and Test of the Structural Stability of the Skeletonof a Large Caliber Filter

用于500吨级液氧煤油发动机的推进剂入口过滤器具有结构跨度大、迎流安装等特点。在网面压力载荷作用下,作为主要承力结构的过滤器骨架存在失稳风险。对此,在完成过滤器工作载荷分析基础上,通过有限元方法对过滤器骨架结构稳定性进行了计算,获得了结构强度及稳定性余量;其次,进一步设计并开展了过滤器骨架的结构稳定性静力试验。结果表明,过滤器结构方案强度和稳定性余量充足,满足设计要求;结果同时表明,计算结果与试验结果具有较高的一致性,从而验证了计算方法的有效性。

The caliber filter in the inlet propellant of the 500-ton LOX/kerosene rocket engine has a large structural span and inflow installed, which makes the skeleton of the caliber filter, as the primary force-taking structure, facing a risk of destabilization when under the pressure of the filter screen. For this, for the first, based on the work of working load analysis of the caliber filter, the structural stability of the skeleton is calculationed by finite element method and both of the strength margin and the stability margin of the sturcture are obtained. For the second, the static test of the structural stability of the skeleton is designed and implemented. The results show that the strength margin and the stability margin of the sturcture are enough and the designing requirement is satisfied. The results also show that the results of calculation are well consistent with that obtained in the test, thus the effectiveness of the calculation is validitied.