Rapid decompression of pressurized aircraft fuselages

Pratt, John D.

doi:10.1361/154770206x156268

Cited by 8 publications

(14 citation statements)

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“…However, little insight has been given about their model limitations and capabilities. Recently, Pratt [25] considered the dynamics of passive and active venting blowout panels and hinged doors between different pressurized airplane compartments in case of rapid decompression. Mass and the moment of inertia of the panels were considered, but otherwise the model seems to be too simplistic.…”

Section: Daidzic and Simonesmentioning

confidence: 99%

“…Title 14 of the Code of Federal Regulations (CFRs), commonly known as Federal Aviation Regulations, restricts maximum CA to 8000 ft (CFR Sec. 25.841 [14]). At 10,000 ft the CA cockpit warning is issued, and at a CA of 14,000 ft, the passenger oxygen mask will deploy.…”

mentioning

confidence: 99%

“…Passive and active venting between various pressurized chambers, swing panels, and blowout panels in the security door are supposed to minimize these risks [23][24][25]. But it is not clear that the existing airplanes in service, now retrofitted with the intrusion-proof flightdeck doors, have enough fast bypass-venting capacity to timely reduce the peak forces on the door.…”

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confidence: 99%

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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%

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confidence: 99%

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Aircraft Decompression with Installed Cockpit Security Door

Daidzic

Simones

2010

Journal of Aircraft

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“…In order to minimize the risks due to rapid decompression, passive and active venting between compartments are usually used in modern pressurized aircraft (Langley 1971, Pratt 2006. The aim of those vents, in fact, is to provide sufficiently fast air discharge to timely avoid pressure picks on primary and secondary structures during a decompression.…”

Section: Active Ventingmentioning

confidence: 99%

“…These devices allow to facilitate the flow of air and the re-equalization of pressure, thus limiting pressure forces on the structures. Pratt (2006) recently modeled swinging and translational blowout panels in the analysis of aircraft decompression. He developed an isentropic model and highlighted the importance of considering panels weight in the estimation of pressure differentials between compartments.…”

Section: Introductionmentioning

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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Decompression Analysis for Maximum Effective Flow Area in Emergency Descent

Liu

Lin

2019

Lecture Notes in Electrical Engineering

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Rapid decompression of pressurized aircraft fuselages

Cited by 8 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 Analysis for Maximum Effective Flow Area in Emergency Descent

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