| Compared with the previous engine,the hydrogen-oxygen engine has been improved greatly in thrust and various performance parameters,while its working condition is more severe.In order to get a deep understanding of engine’s details and mechanism,it is necessary to seek the transformation from traditional development mode to digital development mode.As an important part of digitization,virtual verification,needs to be carried out widely.As an important component of the thrust chamber of an engine,the nozzle’s structural reliability affects the performance of the engine.while the force and thermal environment of the nozzle are complex,it is of great significance and value to carry out the virtual verification of the structural strength characteristics of the nozzle.This paper deconstructs the concept of virtual verification from four aspects: definition,category and hierarchy,support framework and general workflow.The virtual verification is defined as a comprehensive technique to simulate the performance of physical products by means of simulation.The virtual verification is divided into two levels: engineering simulation and virtual test.In the logical structure,the virtual verification is divided into four levels: basic tool layer,service layer,core layer and application layer,and the general workflow of virtual verification is established.On the basis of defining the concept of virtual verification,this paper studies the virtual verification system of nozzle,summarizes the virtual verification project of nozzle with different structure levels in the whole life cycle to form the virtual verification project system of nozzle.The function that the nozzle virtual verification system needs to satisfy is to manage the scattered simulation items under a unified framework,to form a standardized simulation template and to reduce the repetitive work in the simulation process.The module composition,work flow and interface of the nozzle virtual verification system are given,and the characteristics of different simulation tools are compared in detail.Finally,the construction of the nozzle virtual verification system is preliminarily realized with the software of skyship COMAN.The logical and physical architecture of the nozzle is defined in the software,and the process of tool encapsulation and process integration is demonstrated.In this paper,according to the characteristics of the nozzle structure,the finite element model of the nozzle regenerative cooling section and the single-wall radiation section is established and the quality of the finite element model is verified.The feasibility of the finite element method is verified by the calculation of 25 MPa hydraulic test strength,and the structural strength of the nozzle under steady state operation is simulated by the finite element method.The results show that the structural strength of the nozzle meets the engineering design requirements.After engineering simulation of structural strength characteristics of nozzle,virtual test of structural strength characteristics under steady-state operation of nozzle is carried out in order to get a deeper understanding of nozzle.Firstly,the single-wall radiation section is taken as the research object to verify the coupling effect of the single-wall radiation on the pressure field during steady-state operation.Then the whole structure of the nozzle is calculated,and the results are compared with those of the engineering simulation,which proves the reliability of the engineering simulation.Finally,a single cooling channel is calculated,the calculation results show that the cooling channel is shifted to the outer wall due to the gas pressure in the steady state and the maximum Mises stress is 295MPa。... |
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