![]() ![]() ![]() Both supercritical and subcritical decompressions are considered, and the attention focuses on intercompartment venting systems. Air flows between two compartments and between the damaged compartment and external ambient are modeled by assuming an adiabatic, reversible transformation. In this paper, a zero-dimensional mathematical formulation for rapid and explosive decompression analyses of pressurized aircraft is developed. The testing results also show a consistent trend which is 583 ms, 450 ms, and 384 ms, respectively, to reach the equilibrium state. The simulation results show that the effect of the opening on the decompression process is very obvious and the decompression time corresponding to 50%, 75%, and 100% opening is 479.1 ms, 320.7 ms, and 290.1 ms, respectively. The CFD simulation and the verification system are established for the airflow in the rapid decompression process under different opening degrees. The mathematical formulation is also developed, and the comparisons with the results from the literature demonstrate its validity. A new reusable quick opening mechanism which can be opened in millisecond is designed to meet the testing requirement of ground simulator for extremely rapid decompression, and the testing results show that the quick opening mechanism can be opened within 0.1 s. The research of rapid decompression with its effect assessment and protection technology is the problem that must be faced by the future exploration projects such as near space exploration, deep space exploration, and long-term lunar or Mars base. This work provides a new engineering method for structure strength design and decompression load analysis with high accuracy and low resource consumption. The relative deviation between the results of the correlation equation fit and the results of the one-dimensional simulation is less than 3%. The non-dimensional decompression time and the non-dimensional decompression load are developed to evaluate the decompression characteristics, and the correlation equations are established. Then, the 1-D model is applied to study the influence of cabin and cockpit volume, windshield and decompression panel area, compartments, and environment pressure on the decompression load. The accuracy of these models is presented by comparing them with experiments and 3-D CFD simulations. A 0-D isentropic model and a 1-D model based on the characteristic line are developed to simulate the rapid decompression process of the cockpit-cabin model due to a cracked windshield. To prevent the possible accident of a large passenger plane due to rapid decompression, transient load analysis is of vital importance in the assessment of structure strength and also an important clause of airworthiness standard. In addition, this puts the crew in danger due to explosive decompression on the time scale of 100 ms and increases the possibility of the security door being blown out of the frame. The resulting pressure differential between the cockpit and the cabin can create instantaneous forces in excess of 80 kN on the cockpit security door. The recently required cockpit doors may be hazardous for flight crew in the case cockpit depressurizes first and other venting and blowout panels malfunction or are too slow to respond. The case in which the cockpit depressurizes first and its effect on the cabin decompression and on the security door integrity has been extensively studied. The simulations for typical corporate and large-transport-category airplanes with different cabin geometries, discharge coefficients, rupture cross-sectional areas, pressure altitudes, and cabin altitudes have been obtained. New analytical estimates for the total decompression time and the pressure half-time were derived. A comprehensive isentropic and isothermal theoretical analysis is presented with many closed-form and asymptotic solutions. The hinged panels in the security door were modeled to account for the pressure-equalization dynamics in the case of cockpit decompression. # Gravitee.IO Cockpit Management API - Configuration # This file is the general configuration of Gravitee.IO Cockpit Management API: # - Properties (and respective default values) in comment are provided for information.A zero-dimensional model of cockpit and cabin decompression with cockpit security door is presented. ![]()
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