Research On Flexible Skin Techniques For Adaptive Bump Inlet

In order to obtain good engine performance,adaptive bump inlet has the ability to adjust the intake volume of air flow according to the different flight environment.In this paper,an adaptive bump inlet approach is proposed.An adaptive bump based on flexible skin is used to adjust the intake air flow.Targeting the deformation demand of the adaptive bump,a composite flexible skin reinforced by shape memory alloy fibers is designed.The main research contents and contributions are as follows:(1)Targeting the different requirements of intake at different speeds of the supersonic inlet,an adaptive bump inlet approach is proposed.The design ideas and implementation process of the approach are expounded.According to the design requirements of the inlet of a certain fighter,the shape parameters and the pressurization program of the adaptive bump are designed.The research on the strain and modulus requirements of flexible skin are carried on by simulation method.(2)Targeting the deformation demand of the bump,a shape memory alloy reinforced fiber is studied.The constitutive model of the memory alloy is established through thermodynamic methods,and is finite-elementized through the UMAT subroutine function of the ABAQUS software.The super elastic and shape memory effects of the model are verified by simulation.(3)Targeting the design demand of the adaptive bump,a memory alloy fiber reinforced composite flexible skin is designed.The mechanical model of the skin is established and the influencing factors of its mechanical properties are analyzed.Through the optimization of fiber and matrix parameters,the composite flexible skin that meets the requirements of adaptive bump is designed.