A CFD Analysis of Sudden Cockpit Decompression

Breard, Cyrillle; Lednicer, David; Lachendro, Nate; Murvine, Everett

doi:10.2514/6.2004-54

Cited by 7 publications

(5 citation statements)

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“…However, no aircraft emergency descent performance, multiple compartments, venting system dynamics, and security door were included. The only paper dealing with the problems of cockpit security door that we could find was by Bréard et al [36]. The authors used commercial 3-D computational fluid dynamics (CFD) code to calculate the external velocity and pressure distribution around the cockpit of a cruising airplane and the internal flight-deck pressure distribution caused by side-window failure.…”

Section: Daidzic and Simonesmentioning

confidence: 99%

Aircraft Decompression with Installed Cockpit Security Door

Daidzic

Simones

2010

Journal of Aircraft

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A zero-dimensional model of cockpit and cabin decompression with cockpit security door is presented. The hinged panels in the security door were modeled to account for the pressure-equalization dynamics in the case of cockpit decompression. A comprehensive isentropic and isothermal theoretical analysis is presented with many closed-form and asymptotic solutions. New analytical estimates for the total decompression time and the pressure half-time were derived. 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. 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 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 resulting pressure differential between the cockpit and the cabin can create instantaneous forces in excess of 80 kN on the cockpit security door. 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.

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Section: Daidzic and Simonesmentioning

confidence: 99%

Aircraft Decompression with Installed Cockpit Security Door

Daidzic

Simones

2010

Journal of Aircraft

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“…In fact, represents the ratio between the actual diabatic flow rate and the approximate isentropic flow rate (Holman 1980). The discharge coefficient can be evaluated trough measurements, complex CFD analyses (Bréard et al 2004) or via sensitivity analyses (Daidzic and Simones 2010). In the case in which , the mass flow rate will depend on the conditions of both chambers and ; i.e.…”

Section: Isentropic Model Of the Fuselage Decompressionmentioning

confidence: 99%

Gasdynamics of rapid and explosive decompressions of pressurized aircraft including active venting

Pagani¹,

Carrera²

2016

Advances in aircraft and spacecraft science

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In this paper, a zero-dimensional mathematical formulation for rapid and explosive decompression analyses of pressurized aircraft is developed. Air flows between two compartments and between the damaged compartment and external ambient are modeled by assuming an adiabatic, reversible transformation. Both supercritical and subcritical decompressions are considered, and the attention focuses on intercompartment venting systems. In particular, passive and active vents are addressed, and mathematical models of both swinging and translational blowout panels are provided. A numerical procedure based on an explicit Euler integration scheme is also discussed for multi-compartment aircraft analysis. Various numerical solutions are presented, which highlight the importance of considering the opening dynamics of blowout panels. The comparisons with the results from the literature demonstrate the validity of the proposed methodology, which can be also applied, with no lack of accuracy, to the decompression analysis of spacecraft.

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“…The 3-D simulation of the rapid decompression process is one of the most direct and accurate methods for decompression load analysis. Breard et al [6] used commercial 3-D CFD code to simulate the decompression process for an aircraft with the cockpit windshield off. Bai et al [7] investigated the influence of throttling and cabin volume on the explosive decompression process by 3-D numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Decompression Load Analysis in Large Passenger Planes with Windshield Cracked

et al. 2022

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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. 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. The accuracy of these models is presented by comparing them with experiments and 3-D CFD simulations. 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 non-dimensional decompression time and the non-dimensional decompression load are developed to evaluate the decompression characteristics, and the correlation equations are established. The relative deviation between the results of the correlation equation fit and the results of the one-dimensional simulation is less than 3%. This work provides a new engineering method for structure strength design and decompression load analysis with high accuracy and low resource consumption.

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A CFD Analysis of Sudden Cockpit Decompression

Cited by 7 publications

References 0 publications

Aircraft Decompression with Installed Cockpit Security Door

Aircraft Decompression with Installed Cockpit Security Door

Gasdynamics of rapid and explosive decompressions of pressurized aircraft including active venting

Decompression Load Analysis in Large Passenger Planes with Windshield Cracked

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