Results 1 to 10 of about 16,753 (215)
Model-based stagnation pressure control in a supersonic wind tunnel [PDF]
FME Transaction, 2016 The flow parameters control in wind tunnels is an area of intense research in recent years, with the aim of improving quality and efficiency of the wind tunnel operation. In this paper, an attempt is made to contribute to a better understanding of the stagnation pressure control in supersonic blowdown-type facilities.
Biljana Ilić +3 more
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Nonlinear L1 adaptive control of stagnation pressure in a cryogenic wind tunnel [PDF]
Advances in Aerodynamics, 2020 AbstractCryogenic wind tunnel is a sophisticated aerodynamics ground test facility, which operates in cryogenic temperature with injection of liquid nitrogen. The multi-variable, nonlinear and coupled dynamics existing between the temperature, pressure and Mach number in the tunnel, poses great challenges for the effective control of the tunnel.
Rusong Zhu +4 more
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Moving Model Test of High-Speed Train Aerodynamic Drag Based on Stagnation Pressure Measurements. [PDF]
PLoS One, 2017 A moving model test method based on stagnation pressure measurements is proposed to measure the train aerodynamic drag coefficient. Because the front tip of a high-speed train has a high pressure area and because a stagnation point occurs in the center ...
Yang M, Du J, Li Z, Huang S, Zhou D.
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Increase in stagnation pressure and enthalpy in shock tunnels [PDF]
31st Aerospace Sciences Meeting, 1993 A new technique based on the insertion of a converging section in the driven tube is described which is capable of producing substantial increases in both reservoir pressure and enthalpy. A 1D inviscid full kinetics code is used to study a number of different locations and shapes for the converging driven tube section.
DAVID BOGDANOFF, JEAN-LUC CAMBIER
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Micrometer-sized droplets from liquid helium jets at low stagnation pressures [PDF]
Physics of Fluids, 2022 Droplets and droplet beams produced from the breakup of micrometer-sized liquid helium jets in vacuum were studied in this work, advancing into previously unexplored regimes of low stagnation pressures. Using a 5 μm orifice, the droplet beam shows surprisingly diverse characteristics at increasing nozzle pressures from 0.6 to 100 bar: a well-collimated
Katharina Kolatzki +5 more
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Definition of vortex boundary using stagnation pressure
Physical Review FluidsA novel method is proposed to identify vortex boundary and center of rotation based on tubular surfaces of constant stagnation pressure and minimum of the stagnation pressure gradient. The method is derived from Crocco's theorem, which ensures that the gradient of stagnation pressure is orthogonal to both the velocity and vorticity vectors.
Marc Plasseraud, Krishnan Mahesh
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Normal pressure hydrocephalus (NPH): ischaemia, CSF stagnation or both [PDF]
Brain, 2004 Normal pressure hydrocephalus (NPH) is a clinical and radiographic syndrome first described by Hakim and Adams in 1965 (Hakim and Adams, 1965) and characterized clinically by gait apraxia (‘magnetic gait’), incontinence and dementia, and diagnosed predominantly among people over the age of 60 years. Only a minority of patients present with the complete
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Interaction of two vortices in a flued with lower stagnation pressure [PDF]
Quarterly of Applied Mathematics, 1977 The flow field induced by two point vortices of strength Γ \Gamma at a distance 2 h 2h apart in a quiescent field with lower stagnation pressure is investigated. The flow field around the vortices is bounded by a free streamline with constant velocity U U determined by the ...
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Mechanism and numerical simulation of pressure stagnation during water jetting perforation [PDF]
Petroleum Science, 2008 When perforating with an abrasive water jet, it is possible that the pressure in the hole (perforation) will be higher than that in the annulus because of water jet blasting against the hole wall, which also is the theoretical basis for the technology of hydro-jet fracturing.
Zhongwei Huang +4 more
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Fish balances flow resistance and high pressure in stagnation area
Journal of Aero Aqua Bio-mechanisms, 2023 Go Eguchi +3 more
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