Abstract
As a special type of aviation hydraulic pipe joint, a beam seal comprises two annular sealing areas. This paper presented a leakage model for an annular sealing area based on a developed three-dimensional percolation grid model and the porous medium theory. Both average contact pressure and true contact width of the beam seal were simulated using the finite element method. An experimental study of beam seal verified the accuracy of the numerical results. Considering that the two sealing areas and the groove in the beam seal form an isolated sealing system, a leakage model of the beam seal is proposed based on the leakage model for annular sealing area. We evaluated the effects of the roughness of the surface, preload and fluid pressure on the leak rate of the beam seal. Furthermore, the geometry of the beam seal was modified to improve its sealing performance. This study provides an evaluation method for optimizing the design and improving the sealing performance of the beam seal.
Highlights
Aviation hydraulic pipe joints are basic hydraulic accessories that combine hydraulic pumps, valves, cylinders, and other hydraulic components through pipes to form a hydraulic system
We aimed to develop a leakage model to evaluate the sealing performance of a beam seal with two annular sealing areas and to modify the geometry of the beam seal
The proposed leakage model can be used to evaluate the effects of the surface, preload and fluid pressure in the pipe on the leakage performance of the beam seal
Summary
Aviation hydraulic pipe joints are basic hydraulic accessories that combine hydraulic pumps, valves, cylinders, and other hydraulic components through pipes to form a hydraulic system. Pipe joints are widely distributed in aircraft hydraulic systems, and any leakage of pipe joints will cause the aircraft hydraulic system to malfunction. Among these pipe joints, the beam seal, as a new type of seal, can form two annular sealing areas during the assembly. A beam seal can be assembled and disassembled more than 25 times without leakage [1,2]. Owing to these advantages, the beam seal is expected to replace the pipe joints currently used
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