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Isentropic air flows at high stagnation pressures
Fluid Dynamics, 1974Calculations of the gasdynamic parameters of air using different equations of state for a real gas in one-dimensional formulation were carried out in [1-3]. The results from these papers are of a limited nature, as the equation of state of a real gas, which occurs in the system of starting equations, is valid for a quite narrow range of total pressures
L. M. Davydov, V. M. Zhiravov
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Accuracy in Computational Aerodynamics Part 1: Stagnation Pressure
SAE Technical Paper Series, 1998<div class="htmlview paragraph">For the computation of the flow around a car there is typically an overprediction of stagnation and base pressure coefficient by 0.02 and 0.07 respectively causing an underprediction of total drag by about 0.01 - 0.02.</div> <div class="htmlview paragraph">To determine the cause of the error in ...
Niklas Axelsson +2 more
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A stagnation pressure probe for droplet-laden air flow
Journal of Propulsion and Power, 1985It is often of interest in a droplet-laden gas flow to obtain the stagnation pressure of both the gas phase and the mixture. A flow-decelerating probe (TPF), with separate, purged ports for the gas phase and the mixture and with a bleed for accumulating liquid at the closed end, has been developed.
S. MURTHY, M. LEONARDO, C. EHRESMAN
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Recursive identification of stagnation pressure in wind tunnel system
2016 35th Chinese Control Conference (CCC), 2016Identifying an accurate model of the stagnation pressure on-line will benefit the design of the controller and improve the quality of the wind tunnel experiments. This paper focuses on the recursive identification of the stagnation pressure in the wind tunnel system.
Feng Yu, Ping Yuan, Zhizhong Mao
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The Effect of Nonuniform Viscosity on Stagnation Point Pressure
Journal of Fluids Engineering, 2011For high Reynolds number flows the total pressure remains constant along stream lines. At low Reynolds numbers the total pressure decreases in a global sense due to the actions of viscosity, but it may increase locally in regions such as stagnation points. Previous studies have considered the case of constant viscosity flow.
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A Pneumatic Probe for Measuring Spatial Derivatives of Stagnation Pressure
Volume 6: Ceramics; Controls, Diagnostics, and Instrumentation; Education; Manufacturing Materials and Metallurgy, 2019Abstract This paper introduces a pneumatic 9-hole probe which can measure flow angles, stagnation and static pressures, and spatial derivatives of stagnation pressure. It does this through direct measurement at a single location, rather than empirical corrections using measurements at multiple points.
C. J. Clark, S. D. Grimshaw
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A Stagnation Pressure Probe for Supersonic and Subsonic Flows
Aeronautical Quarterly, 1974SummaryThe usefulness of a probe which can sense the absolute value of the stagnation pressure in supersonic flow has long been recognised. In the past such a probe has not been available and therefore it has been necessary to infer this fundamentally important flow property from measurements of other properties.
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Stagnation pressure effect on Prandtl Meyer function for air
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 2016When the stagnation pressure of a perfect gas increases, the specific heat and their ratio do not remain constant anymore and start to vary with this pressure. The gas does not stay perfect. Its state equation change and it becomes for a real gas. In this case, the effects of molecular size and intermolecular attraction forces intervene to correct the ...
Merouane Salhi +2 more
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Randomised, controlled pilot to compare collagen and foam in stagnating pressure ulcers
Journal of Wound Care, 2012Objective: To compare the clinical efficacy of a collagen dressing covered with a foam dressing with the same foam used as a primary dressing in stagnating granulating pressure ulcer patients. Method: Patients were randomised to receive either a foam dressing (Suprasorb P; Lohmann & Rauscher) as a primary dressing (group A), or a combination of a ...
A, Piatkowski +5 more
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Microprocessor control of high-speed wind tunnel stagnation pressure
15th Aerodynamic Testing Conference, 1988The development and implementation of a control algorithm for the microprocessor-based stagnation pressure control system of the Penn State Supersonic Wind Tunnel Facility is reported. The gas dynamics and the controlvalve characteristics of this blowdown-type facility are nonlinearly related. A mathematical model was developed for the open-loop system
Y.-T. FUNG, G. SETTLES, A. RAY
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