Simulation Of Pressure Regulating System Of Aircraft Cabin

High-performance aircraft is bound to be equipped with a set of state-of-the-art cabin pressureregulating system. Comfortable cabin environment can ensure air crew work efficiently. However,research for the system can not reach the requirement at present; especially domestic research is stillinsufficient.A combination research of theoretical analysis and simulation study for exhaust valve of cabinpressure regulating system has been completed in this paper. Research status at home and abroad,characteristics of aircraft flight environment, cabin altitude, cabin pressure differential, pressurechange speed and pressure regime that should be met in the flight are analyzed.The valve’s opening degree and overall size have been obtained through establishing themathematical model of the cabin and exhaust valve. Three-dimensional physical model of valve isbuilt by CATIA. The tetrahedron-based unstructured grid is divided, the mesh quality is checked andboundary conditions are set using GAMBIT. The UDFs of valve imports, export and moving wallhave been complied by using C++and macro functions and used for corresponding boundaries.Dynamic meshes for moving wall, deformation boundaries, and deformation zones have been set inFLUENT.The relationships of valve flux, opening degree with height and exhaust valve internal pressureand velocity distribution have been obtained through simulating and analyzed then. Finally, thepressure regulating system of MA700is simulated using the simulation principle to verify thepracticability of this simulation.The work in this paper provides a reference for research of cabin pressure regulating system infuture and has a certain useful value.