Numerical Simulation Of SRM Grain Regression And Flow Field Based On Immersed Boundary Method

The solid rocket motor has the advantages of simple structure,strong maneuverability and high reliability,and has great application prospect in the field of tactical or strategic missiles.The solid rocket motor internal flow field parameter is an important reference for judging the combustion performance of the engine charge and engine shape design and other factors,which have attracted wide attention from domestic and foreign scholars.At present,the simulation of the flow field in the engine combustion chamber is mostly in the quasi-steady state.During the working process of the engine,the burning surface regression,which will affect the internal flow field of the solid rocket motor.The numerical simulation of rocket engine internal flow field will make the calculation result more close to the actual situation.This paper reviews the development process of interface capture and immersed boundary,selects CLSVOF method as the implementation method of interface capture,and selects discrete immersed boundary method as interface flow field processing method.In this paper,OpenFOAM is used as a computing platform,and the classic backstepping model is used to verify the applicability of the incompressible discrete immersed boundary method in the OpenFOAM platform and lay a foundation for algorithm improvement.In this paper,we modify the solver to improve the incompressible discrete immersed boundary,and improve the algorithm to compressible discrete immersed boundary method.The CLSVOF method is coupled with the compressible discrete immersed boundary method,and the fvOptions framework is used to realize the commonality of submerged boundary source terms on the computational platform.By using the example of classical cylinder flow,the feasibility of the improved algorithm is verified.By revising the solver to realize the movement of the submerged boundary and creating the bounding of the boundary,the internal flow field of the internal combustion engine and the complex flow field of the internal combustion charge are numerically simulated.The transient internal flow field results,Pressure time curve.Compare the literature results to verify the applicability of the algorithm.By calculating the flow field in the segmented charge engine,the dynamic internal flow field of different charge sections is obtained,and the coupling analysis is validated to verify the universality of the coupling algorithm.The results of this paper broaden the application field of domestic immersed boundary and lay a good foundation for the integrated calculation of flow field in the engine.