Numerical Simulation Analysis Of Composite Lattice Sandwich Structure

With the development of aerospace industry,the demand for hypersonic aircraft is getting higher and higher.While developing and researching faster and lighter aircraft,it also brings huge challenges to the structure of the aircraft.The environment faced by the aircraft during service is more severe and complex,and the overall safety performance of the aircraft needs to be improved urgently.The thermal protection design of the high-temperature structure of hypersonic aircraft has always been a key concern when designing and developing aircraft.When designing the surface heat dissipation structure of the aircraft,it is required not only to ensure that the structure is not corroded and sintered under high-temperature service conditions,but also to ensure that it has a good In order to achieve the effect of cooling and cooling,while ensuring sufficient rigidity and strength to meet the load-bearing function and resist the impact of airflow.This article mainly proposes two new types of composite lattice sandwich structures,which integrate porous materials into the lattice structure panel,so that the overall heat transfer structure can not only exert the lightweight,high specific rigidity and high specific strength of the lattice structure.Advantages,it can also use the sweat cooling function of porous materials to meet the requirements of heat exchange and cooling.Mainly carry out the following researches on it:First,use catia to establish two different lattice structures,and combine the porous plate structure with uniformly distributed surface pores and the lattice structure.The finite element software workbench is used to numerically simulate the two lattice heat transfer structures.Using the same cooling medium,compare the overall heat transfer and pressure distribution of the two lattice structures at different flow rates,obtain the temperature field and pressure field distribution cloud diagram of the cooling medium,and compare the heat transfer performance of the two;The field results are imported into the lattice structure,and the temperature field and pressure field of the structure are solved through thermo-fluid-solid coupling,and the stress and strain distribution of the structure as a whole when the two structures are single acting on the flow field are explored.Secondly,re-grid,load the temperature result calculated by the fluid as a boundary condition on the surface of the structure,and apply different static pressures to the upper surface of the structure to calculate the stress field of the lattice structure when the structure is subjected to two loads at the same time.And the overall deformation distribution,by comparing the stress distribution result data,compare the bearing capacity of different lattice structures.Finally,the thermal and mechanical coupling calculations are performed on the two structures.Apply a high temperature load on the surface of the lattice structure and apply different pressures respectively,calculate the overall stress and strain distribution of the structure under the high temperature load and the main failure location,compare the loadbearing performance of the two lattice structures,and select the appropriate one for the lattice structure design material.