Review of Vent Systems of Space Vehicle, Spacecraft and Aircraft

Abstract

The main focus of the review article is to present the vent system of space vehicle and spacecraft. Quasi-one dimensional, quasi-steady and isentropic analytical and computational fluid dynamics equations are employed to compute differential pressure inside the compartment. Discharge characteristics of vent system depend on geometry, location of vent and external environment. An inverse analysis is performed to estimate the discharge coefficient using measured and computed compartment differential pressure time history. The reconstructed differential pressures of the compartment are compared with pre- and post-flight data. The differential pressure and the rate of pressure drop in the compartments are analysed via isentropic equations. A numerical scheme based on compressible gas dynamics relation is discussed for pressurization of aircraft cabin. The vent valve with a spring loaded butterfly valve can be evaluated using the isentropic relations.