The Fluid-thermal Coupling Simulation Research On High-pressure Gas System Of Rocket Engine

Non-metallic products sutably being used on normal temperature environment is usually used in gas-controlling system valves or gas-flowing system valve of Liquid Rocket Engine.The function of them are preventing out-leak,producing damp or separating fluids.The performance and stability of non-matallic products have great influence on the performance of the valve,the function of the system and the working condition of the engine.And the performance and stability of non-metallic products are often affected by external factors,such as temperature,stress state,the media type of their storage time,etc.In this paper,on the background of the development of one of the national key types of liquid rocket engine,to the high pressure gas path system as the reseach object,according to the digital modeling theory and flow thermal coupling simulation,using gambit software to simplify the modeling of the object of study,using the fluent analysis software of the of flow thermal coupling simulation analysis is the flow and the heat are solved,respectively,iterative coupling of common boundaries in the fluid region and solid region,to obtain direct contact and non metal solid wall temperature distribution,so as to carry out effective evaluation of the gas system in a non metal working state.The whole simulation analysis process captures the focus of system modeling,namely pressure reducer valve movement dynamic mesh modeling and parameter update settings,because the regulator outlet pressure stabilizing effect on the whole system of fluid thermal coupling simulation calculationg convergence very important role to play.The main research contents are as follows:a)Study the high pressure gas path system modeling method,through the familiar with the internal components of the structure,to distinguish between internal component parts to research the accuracy of primary and secondary,appropriate,effective and feasible structure of the componets was simplified.According to the simplified structure of finite element modeling.b)The regulator valve core structure of dynamic grid area establishment,moving the grid mesh and boundary conditions and continuous regional setting and separate the reducer internal flow thermal coupling simulationg,the comparison of the calculationg results,the knowledge dynamic moving mesh surface actual travel distance similarly on the fitted values are basically consistent,precalculated outlet pressure value is very stable,temperature distribution is also in line with expectations to verify the pressure reducer dynamic mesh modeling and fluid thermal coupling calculation method is correct.c)Using flow thermal coupling simulation analysis method to study the workflow engine high pressure gas path system profile and their dynamic internal structure of solid temperature field,pressure field and velocity field distribution,the non-metal contact solid wall temperature change trend and non metal working temperature limit that high pressure gas path system medium temperature change,and solid heat transfer of non metal normal use had no effect.d)Finally set up the real high pressure gas path system blowing except for the simulation test study.The research results show that through flow thermal coupling simulation analysis method to obtain the automatic device internal non-metal contact solid wall temperature change trend and real test results are in good agreement,the variation of absolute deviation is small and the calculation precision is high,which can be applied in the engine system.