航空管路接头密封特性及流体温度影响

对多尺度有限元模拟开展管路接头密封特性研究。基于管接头各部件粗糙表面的实测数据,建立具有粗糙表面的管路接头密封区域多尺度模型,通过接头拧紧过程的模拟计算获得了接头密封状态和密封性能。研究结果表明:多尺寸模型可以真实反映出管路接头拧紧过程中的密封状态和特性变化规律,从而提高管路接头装配方法计算精度;另外,在接头拧紧过程中,管路与卡套结合处高应力区是通过两个高应力区域向四周扩散的,管路接头密封性能变化呈现线性变化,并且管路接头最佳装配状态需要达到特定装配位置,合理可靠的装配对管路接头使用尤为重要;同时,流体温度在允许范围内,对管路接头的密封特性有一定影响。 

Sealing characteristics of aviation pipeline fittings and influence of fluid temperature

The multi-scale finite element simulation method was used to study the sealing characteristics of pipeline fittings. Based on the measured data of rough surfaces, the multi-scale model of pipeline fittings was modelled, sealing state and sealing performance of fittings were obtained by simulating the tightening process of fittings. The results showed that the calculation results based on the multi-scale model could really present seal characteristics of pipeline fittings, and improve the calculation accuracy of pipeline fittings assembly method. In addition, during the process of fittings tightening, thehigh stress zone between pipeline fittings and ferrule diffused to all sides through two high stress zones, and the change of sealing performance of pipeline fittings presented linear change. When the displacement of ferrule reached certain position, the pipeline fittings achieved the optimal assembly state, making it particularly important for the application of pipeline fittings. Besides, the fluid temperature in the allowable range had certain influence on the sealing characteristics of pipeline fittings.