A Method for Analyzing the Characteristics of the Swinging High-speed Jet Flow of the Nozzle of an Underwater Engine

Abstract

The invention discloses an analysis method for the swinging high-speed jet flow characteristics of the underwater engine nozzle. By establishing the geometric model of the underwater solid rocket motor nozzle, the fluid calculation domain is established, and the interface between the two fluid calculation domains is geometrically optimized. Interfaces are set between domains for data transfer to realize the simulation of nozzle swing conditions, grid division is performed on the water domain in blocks, and grid independence verification is performed to obtain the optimal number of grids; the final grid file will be obtained Import it into the FLUENT solver, set the boundary conditions, the calculation model and calculation method used, and solve the problem; through the numerical simulation analysis and post-processing of the numerical calculation results, the flow characteristics of the high-speed jet flow of the rocket engine nozzle swing can be accurately simulated and analyzed. It helps to reveal the law and mechanism of nozzle swing high-speed jet flow, provides a theoretical basis for the design of engine nozzle structure for underwater powered missile launch, and solves the actual engineering application problems of underwater powered missile launch.

Description

technical field [0001] The invention belongs to the field of fluid mechanical engineering, and relates to an underwater solid rocket motor nozzle swing high-speed jet flow field structure and thrust characteristic analysis method, in particular to an underwater solid rocket motor nozzle swing high-speed jet based on secondary development of CFD software Analysis method of jet flow field structure and thrust characteristics. Background technique [0002] The launch of submarine-launched missiles can be divided into unpowered and powered launches. The use of powered missile launch technology can actively control the body of submarine-launched missiles, which can greatly improve its combat effectiveness. As the most convenient power source for underwater propulsion technology, solid rocket motors are currently the most effective power source for various strike-type submarine-launched weapons. preferred driving force. [0003] The high density ratio, high back pressure, and co...

AI Technical Summary

Problems solved by technology

At the same time, in order to enable the missile to adjust its flight attitude and obtain more flexible maneuverability when navigating underwater, a thrust vector control device is essential, among which the swinging nozzle has been widely used as a high-efficiency thrust vector control method, and The swing of the nozzle will also greatly increase the complexity of the underwater high-speed jet of the nozzle

At present, there is no relatively accurate analysis method and numerical calculation method for the external flow field structure and thrust characteristics of the underwater nozzle swinging high-speed jet. It is necessary to study a numerical calculation method that can accurately simulate the flow characteristics of the nozzle swinging high-speed jet. Understand the principle of interaction between the water environment and gas when the engine works underwater, master the influence of the expansion ratio and water depth on the engine's operating characteristics, so as to provide a theoretical basis for reasonably predicting the engine's operating characteristics such as thrust value and noise

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