The Shape-curve Optimization Research By Active Control In Finger Seals

The research of the new-type seal technology has been the frontier of the development in the next generation aero-engine with high performance after 1980's~[1]. The finger seal is a new innovative seal after labyrinth seal and brush seal. The purpose of this project is to get the appropriate shape-curve of finger seal for the special work-conditions' seal demand and establish the base for farther research.With summarized a great deal of datum in home and overseas, based on the finger seal's hysteresis and stiffness, the paper will discuss the optimized selection of shape-curve in finger seals.Firstly the shape-curve of finger seal is optimized aiming at farthest lowering hysteresis effect with optimization theory. Base on results, the hysteresis effect of finger seal with optimized shape-curve is analyzed with FEM (Finite Element Method), and is compared with hysteresis effect of finger seal with logarithen spiral I shape-curve. The research indicates that compared with finger seal with logarithen spiral I shape-curve, the finger seal with optimized shape-curve is put forward for improvements of hysteresis effect. Furthermore, considering the purpose of reasonable finger seal construction, we present the active control optimization method across the shape-curve optimization design research. The results obtained by FEM show that active control optimization method is reasonable. Finally, according to the morbidity of design objective lead to difficult to get the finger shape-curve of lower hysteresis with the active control optimization method, we bring forward the corresponding design method to achieve the active control optimization of finger shape-curve of lower hysteresis. This make the shape-curve optimization design method by active control in finger seals have more uses.