Topic
Total pressure
About: Total pressure is a research topic. Over the lifetime, 5199 publications have been published within this topic receiving 66658 citations.
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Patent•
16 Mar 1988
TL;DR: In this paper, a transverse wall is used to measure total temperature and pressure at a common point on an aircraft, where the leading end chamber contains a total pressure sensor and the trailing end chamber is a total temperature sensor assembly.
Abstract: Air data measurement apparatus for use on an aircraft, comprises a housing (1) open at both ends (2, 3) and divided into two chambers (8, 9) by a transverse wall (7). The leading end chamber (8) contains a total pressure sensor (11) and the trailing end chamber (9) contains a total temperature sensor assembly (15) whereby the apparatus functions to measure total temperature and pressure at a common point on an aircraft.
23 citations
TL;DR: In this paper, near-infrared absorption cross-sections of oxygen and nitrogen gas mixtures were determined from laboratory measurements using Fourier transform spectroscopy and a long path-length absorption cell.
23 citations
Patent•
17 May 1988TL;DR: In this article, an apparatus is described for monitoring the temperature of the propulsion gas at the inlet to a turbine wheel in a turbine in which a compressor fuels air into a chamber where it is heated and the heated products exiting the chamber form propulsion gas.
Abstract: An apparatus is disclosed for monitoring the temperature of the propulsion gas at the inlet to a turbine wheel in a turbine in which a compressor fuels air into a chamber where it is heated and the heated products exiting the chamber form the propulsion gas. The temperature of the heated products exiting the chamber is a function of the inlet static and total pressure, the total inlet temperature, the static pressure of the heated products and the static pressure drop across the chamber.
23 citations
Patent•
22 Nov 1971
Abstract: A fan capacity measuring station wherein the fan discharge is first conditioned for accurate flow rate measurement by fixed mixing vanes that break up stratification and negative pressure pockets and by subsequent straightening means that eliminate turbulence and produce substantially laminar air flow through a measuring section of known cross-sectional area. Then in the measuring section total pressure sensors, manifolded in a traverse, average the total pressure and manifolded static pressure sensors average the static pressure. The difference between the average total and static pressure of the conditioned discharge is a direct and accurate measurement of flow rate within + OR - 1 percent.
23 citations
TL;DR: In this paper, the authors investigated the loss generation mechanisms induced by laminar separation bubble and transition process in the UL turbine blade profiles, which induces the formation of a L2L separation bubble, and calculated normal and shear contributions of both viscous and turbulent deformation works.
Abstract: The present paper reports the results of a detailed experimental study, carried out by means of a two-component Laser Doppler Velocimeter, aimed at investigating the loss generation mechanisms induced by laminar separation bubble and transition process. Measurements have been performed along a flat plate installed within a double contoured test section, designed to produce an adverse pressure gradient typical of Ultra-High-Lift turbine blade profiles, which induces the formation of a laminar separation bubble. Results were detailed enough to allow calculating laminar and turbulent deformation works in the separated flow region. Normal and shear contributions of both viscous and turbulent deformation works have been analyzed and employed to explain the generation of total pressure losses in the separated flow region, where the generation and amplification of Kelvin–Helmholtz instability induces the separated shear layer roll-up, thus the bubble reattachment. Results obtained for different Reynolds number conditions have been employed for the formulation of a loss scaling procedure involving the separated shear layer thickness, which is directly correlated to the dynamics of Kelvin–Helmholtz roll-up vortices.
23 citations