Simulation Of The Combustion Process Of The Helicopter Platform

Security issues of helicopter landing platform under fire have been always one of the major issues to be considered when the helicopter is used for the emergency rescue.Fire makes helicopter platform structures withstand high temperatures. The focus which needs to be considered in design, manufacturing and safety profile is whether materials and structures of the platform will withstand such heat shock. The testing experiment's measuring result shows the temperature of everywhere on the platform surface changes dramatically in a short time and the structure of the platform will have a greater thermal stress because of the restriction. Therefor, the research which is about the correlation of the fuel temperature distribution of the fuel flow and heat transfer is of the great significance for the security of helicopter platform.This paper uses CFD analysis software to investigate preliminarily the fuel flow, heat and mass transformation of the helicopter platform surface in fuel combustion.Firstly, the paper have analysed temperature test data of the helicopter platform under fire and found out the variation of peak temperature in fuel combustion. Then, the paper assumed that temperature of the platform surface is consistent with the fuel reservoir thickness in fuel combustion and speculated that the distribution and variation of fuel from the platform surface. According to that basis, the model is built with Gambit. Because the mass flow as boundary conditions is changing over time, this paper uses self-defined function (UDF) to consider such a process. According to the relationship of the surface temperature changing and the variation of fuel mass flow, the maximum mass flow of fuel under initial conditions is speculated. Then the function of fuel mass flow over time is obtained. After that, component combustion and heat transformation solver is used for analysis. Lastly, the actual measured results is compared with numerical simulation results, thus validating the accuracy of numerical analysis. It explains that using the analysis method of component combustion and heat transformation in Fluent is feasible to speculate the liquid fuel flow, distribution and transformation process when the helicopter platform is under fire. The predictions are of great significance about analyzing quantitatively the security of helicopter platform under fire and design and manufacture and design and layout of safety facilities.