U.S. Air Force combat psychiatry.

Jones, David R.

doi:10.1037/e421012004-001

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…Engine exhaust plumes have been an important topic of research to the aerospace community for at least the past 50 years. Before the advent of gas turbine engines, the wake generated by propeller-driven planes during taxi and take-off—commonly called “prop-wash”—was never a substantial threat to life or property but, as commercial and military aviation transitioned to jet-engine-powered craft, the high-velocity, turbulent exhaust plumes produced by these jets quickly signaled a need to address safety issues and implement damage mitigation measures on airfields, in relation to structure frangibility and other non-fixed structures such as noise mitigation panels and specific pavement repairs ( 5 ). In the case of airfield matting systems, the probable controlling limit state because of exhaust plume interaction is that of anchor pull-out failure as a consequence of matting uplift.…”

Section: Aerodynamic Loading Mechanismsmentioning

confidence: 99%

Modeling Exhaust-Generated Aerodynamic Pressure Loads on Airfield Matting Repair Systems

Rittelmeyer

Roueche

Bianchini

et al. 2023

Transportation Research Record: Journal of the Transportation R

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Airfield matting systems are commonly used for rapid repair of damaged runways to facilitate continuity of critical operations. Under normal service conditions, matting repair systems are subject not only to wheel loads exerted by airfield traffic but also to aerodynamic pressure loads resulting from high-speed, turbulent exhaust plumes produced by jets during taxi and take-off. Matting systems employed by the U.S. Air Force have been tested with respect to wheel loads, but probabilities of failure because of pressure loads produced by jet exhaust have not yet been established. This study presents a numerical approach for preliminary estimation of worst-case matting anchor forces resulting from exhaust-generated pressure loads. Using a two-dimensional computational fluid dynamics model, system behavior is evaluated by means of a parametric study of six system variables, of which the most significant are: (1) distance between engine and matting, (2) depth of cavity openings at matting edges, and (3) engine exhaust velocity. The results demonstrate that matting systems are likely to experience net uplift in typical service scenarios, driven by the combined effects of flow separation and cavity pressurization. Worst-case anchor pull-out forces, computed according to a tributary-area approach, are estimated to fall in the range of 130 lb (581 N) to 979 lb (4,350 N), depending on assumed load-sharing behavior among anchors and the size of the repair site. Field testing of instrumented matting systems during jet taxi and take-off sequences is recommended as the best next step toward understanding system behavior.

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Section: Aerodynamic Loading Mechanismsmentioning

confidence: 99%