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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TL;DR: In 1970, water pressure was measured in several moulins on the White Glacier as discussed by the authors, and it was shown that total pressure variations were sometimes greater than this, even at depths of less than 50 m below the surface.
Abstract: In 1970 water pressure was measured in several moulins on the White Glacier. Pressure variations in some moulin channels extended over the full measuring range of the instruments (0–1 and 0–2 bar above atmospheric pressure), even at depths of less than 50 m below the surface. Measurements at different depths showed that total pressure variations were sometimes greater than this. The pressure data are compared with variations in the surface velocity of the glacier.
56 citations
TL;DR: In this paper, a 3mm-diam, dual hot-wire aspiring probe is described which can simultaneously measure total temperature and total pressure in an unsteady high-speed gas flow.
Abstract: A 3‐mm‐diam, dual hot‐wire aspiring probe is described which can simultaneously measure total temperature and total pressure in an unsteady high‐speed gas flow. The probe consists of two coplanar constant temperature hot wires at different overheat ratios operated in a 1.5‐mm‐diam channel with a choked exit. Thus, the constant Mach number flow by the wires is influenced only by free‐stream total temperature and pressure. The probe design is a compromise between the conflicting requirements of spatial resolution, frequency response, and angular sensitivity. The dc temperature accuracy of the probe is about 1% while the resolution is 0.3%. Frequency response of the present design is dc to 20 kHz.
56 citations
TL;DR: In this article, the results from non-accelerating flow experiments conducted with a riser tube of bore 192 mm and height 16.2 m using spherical glass beads of average diameter 64 μm are presented.
56 citations
TL;DR: In this paper, a laser-excited fluorescence was used to detect gas phase silicon atoms during chemical vapor deposition from silane, and relative Si densities were measured as a function of height above the susceptor, susceptor temperature, amount of H2 added to the He carrier gas, and total pressure.
Abstract: Laser‐excited fluorescence was used to detect gas‐phase silicon atoms during chemical vapor deposition from silane. Relative Si densities were measured as a function of height above the susceptor, susceptor temperature, amount of H2 added to the He carrier gas, and total pressure. The Si atom density decreased both upon addition of H2 and as the total pressure was lowered below ∼100 Torr. Comparisons of these measurements with the model developed by Coltrin, Kee, and Miller [J. Electrochem. Soc. 131, 425 (1984)] show that the model predicts the qualitative behavior of the experimental Si atom profiles over a wide range of experimental conditions. Addition of a mechanism for particulate nucleation to the model may resolve some of the discrepancies between model and experiment.
56 citations
TL;DR: In this article, the effects of circumferential distortions in inlet total pressure on the flow field in a low-aspect ratio, high-speed, high pressure-ratio, transonic compressor rotor are investigated.
Abstract: The effects of circumferential distortions in inlet total pressure on the flow field in a low-aspect-ratio, high-speed, high-pressure-ratio, transonic compressor rotor are investigated in this paper. The flow field was studied experimentally and numerically with and without inlet total pressure distortion. Total pressure distortion was created by screens mounted upstream from the rotor inlet. Circumferential distortions of eight periods per revolution were investigated at two different rotor speeds. The unsteady blade surface pressures were measured with miniature pressure transducers mounted in the blade. The flow fields with and without inlet total pressure distortion were analyzed numerically by solving steady and unsteady forms of the Reynolds-averaged Navier-Stokes equations. Steady three-dimensional viscous flow calculations were performed for the flow without inlet distortion while unsteady three-dimensional viscous flow calculations were used for the flow with inlet distortion. For the time-accurate calculation, circumferential and radial variations of the inlet total pressure were used as a time-dependent inflow boundary condition. A second-order implicit scheme was used for the time integration. The experimental measurements and the numerical analysis are highly complementary for this study because of the extreme complexity of the flow field. The current investigation shows that inlet flow distortions travel through the rotor blademore » passage and are convected into the following stator. At a high rotor speed where the flow is transonic, the passage shock was found to oscillate by as much as 20% of the blade chord, and very strong interactions between the unsteady passage shock and the blade boundary layer were observed. This interaction increases the effective blockage of the passage, resulting in an increased aerodynamic loss and a reduced stall margin.« less
56 citations