Results 251 to 260 of about 16,237 (300)

Microprocessor control of high-speed wind tunnel stagnation pressure

15th Aerodynamic Testing Conference, 1988
The 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
openaire   +1 more source

Rotating detonation waves in annular gap with variable stagnation pressure

Shock Waves, 2021
We consider a three-dimensional unsteady flow with one, two, or four rotating detonation waves arising in an annular gap of an axially symmetric device between two parallel planes perpendicular to its symmetry axis. The corresponding problem is formulated and studied.
V. A. Levin, I. S. Manuylovich, V. V. Markov   +2 more
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A stagnation pressure probe for droplet-laden air flow

Journal of Propulsion and Power, 1985
It 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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Stagnation pressure effect on Prandtl Meyer function for air

Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 2016
When 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, Toufik Zebbiche, Abderrahmane Mehalem   +2 more
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Recursive identification of stagnation pressure in wind tunnel system

2016 35th Chinese Control Conference (CCC), 2016
Identifying 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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A Stagnation Pressure Probe for Supersonic and Subsonic Flows

Aeronautical Quarterly, 1974
SummaryThe 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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A Pneumatic Probe for Measuring Spatial Derivatives of Stagnation Pressure

Volume 6: Ceramics; Controls, Diagnostics, and Instrumentation; Education; Manufacturing Materials and Metallurgy, 2019
Abstract 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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An empirical model for stagnation pressure gain in rotating detonation combustors

Proceedings of the Combustion Institute, 2021
Abstract This work investigates the stagnation pressure gain in rotating detonation combustors (RDC) and its dependency on the geometry and mass flux of the combustor. Using a Kiel probe to directly measure stagnation pressure in the high-enthalpy exhaust stream, results are presented for a systematic variation of these parameters.
Eric Bach, C.O. Paschereit, Panagiotis Stathopoulos, Myles D. Bohon   +3 more
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The Effect of Nonuniform Viscosity on Stagnation Point Pressure

Journal of Fluids Engineering, 2011
For 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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Prediction of inviscid stagnation pressure losses in supersonic inlet flows

AIAA Journal, 1990
An effort is made to quantify the stagnation pressure losses associated with shock-wave systems that may be present in such high Mach number flows as those of scramjet hypersonic diffusers. If the shock-related contribution turns out to be much larger than that attributable to viscous effects, a designer could introduce methods for the minimization of ...
David J. Azevedo, Ching Shi Liu, William J. Rae   +2 more
openaire   +1 more source