Numerical Simulation Of Supercritical-pressure Fluid Flow Heat Transfer Based On OpenFOAM

With the rapid development of the research technology of hypersonic vehicles in recent years,the engine,which is the hypersonic vehicle core power composition,cooling problem is also concerned.Because of its fast flight speed,the combustion efficiency and cooling effect of the engine fuel must be very high.At present,endothermic hydrocarbon fuel is the main research object of active cooling of engine due to its unique performance.And its supercritical state in the engine cooling pipe has become a research hotspot.In order to accurately describe the dramatic change of physical properties of supercritical fluid near the critical area,the thermodynamic parameters are calculated based on the Helmholtz free energy,and the transport variables,such as viscosity and thermal conductivity,are calculated according to the relevant transport equations.In this paper,these parameters will be used as physical data of supercritical flow heat transfer numerical simulation.In order to study the flow and heat transfer of supercritical fluid,OpenFOAM is selected as the research tool.Since OpenFOAM itself does not have the physical model of supercritical fluid flow heat transfer analysis,this paper makes a detailed study of its thermal physics model framework to understand its organizational structure.And based on the analysis of the organizational structure,the thermophysical physical model of supercritical fluid flow heat transfer is proposed,which are the look-up table and multi-stage polynomial fitting.In addition,due to the special nature of supercritical fluid flow and heat transfer,OpenFOAM’s existing solver does not meet our requirements.Therefore,this paper develops the solver of supercritical fluid flow heat transfer analysis to ensure the results of solving such special problems correctness.Finally,three examples of supercritical fluid verification were used to demonstrate the effectiveness of the thermophysical parameters,the thermophysical model and the developed solver.And the thermal model and the solver were used to simulate the model of kerosene under supercritical pressure.The numerical simulation was carried out under different working conditions.