The calculation of the asymmetrical three-dimensional flow of the combustion products in a compact size SRM

Abstract

The article is devoted to the problem of calculating the complex flow of combustion products in the solid propellant combustion chamber. The paper presents a calculation of the combustion products flow for three instants of time using the example of an engine for removing of the rocket head fairing. Due to the fact that the nozzle block of the engine is divided into four nozzles, one of which has a larger diameter of the critical section, the gas flow along the internal free volume of the engine is asymmetrical. ANSYS (CFX) software package is used to solve this problem.The article gives a brief description of the engine design and the charge of solid fuel for which calculations are performed. To get out calculations, 3D models of internal free volumes created in Autodesk Inventor are used. Grid is generated in the standard ANSYS ICEM CFD package, which is integrated into the ANSYS (CFX) working environment. Calculation results are given after describing the boundary conditions. The results are presented as a velocity distribution in two mutually perpendicular planes.The proposed methodology for the gas-dynamic calculation of SRM allowed obtaining calculations of higher accuracy in comparison with engineering methods. The approach to the solution of the problem proposed in this article can be widely used not only in the design of drive engines, but other SRMs for various purposes.A