Experimental Investigation of Magneto-Fluid-Dynamic Interaction in Cylindrical Inlet

2007 ◽  
Author(s):  
Joseph Shang ◽  
James Menart ◽  
Roger Kimmel ◽  
James Hayes
Keyword(s):  
Experimental Investigation ◽  
Fluid Dynamic ◽  
Dynamic Interaction

scholarly journals Experimental investigation of the seismic effects during blasting works

2020 ◽  
Vol 313 ◽  
pp. 00019 ◽  
Author(s):  
Daniel Papán ◽  
Zuzana Papánová
Keyword(s):  
Experimental Investigation ◽  
Dynamic Analysis ◽  
Dynamic Load ◽  
Soil Structure ◽  
Seismic Waves ◽  
Experimental Studies ◽  
Dynamic Interaction ◽  
Seismic Effects ◽  
Structure Dynamic ◽  
Structural Failures

The interested part of dynamic analysis is the blasting work effects propagation through soil. This type of the dynamic load can be significant when the soil structure dynamic interaction hasn´t favourable conditions. It can cause structural failures on buildings. The main aim of the paper is to investigate how we can estimate the magnitudes of the seismic waves during blasting works. The results are based on experimental studies.

Experimental Investigation of an Ultra-High Bypass Ratio Embedded Boundary Layer Ingesting Propulsor for Subsonic Cruise Aircraft

2020 ◽  
Author(s):  
David J. Arend ◽  
John D. Wolter ◽  
Stefanie M. Hirt ◽  
John A. Gazzaniga ◽  
William T. Cousins ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Experimental Investigation ◽  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Stability Margin ◽  
Peak Time ◽  
Peak Efficiency ◽  
Speed Test ◽  
Test Conditions ◽  
Bypass Ratio

Abstract An experimental investigation has been completed of the performance and operability of a first of its kind 0.289 scale boundary layer ingesting propulsor within the new 6.5ft × 6ft transonic embedded propulsor testbed of NASA’s 8ft × 6ft Supersonic Wind Tunnel. This propulsor consisted of a coupled inlet and distortion-tolerant fan stage design embedded in a simulated upper aft hybrid wing body aircraft installation. The boundary layer ingesting inlet had a length-to-diameter ratio of 0.67. The distortion tolerant fan was 22 inches in diameter and had a stage pressure ratio of 1.34 and a bypass ratio of 16. The embedded propulsor was evaluated at its Mach 0.78 local freestream conditions. At peak efficiency 100% design speed test conditions, it provided a mass flow weighted inlet total pressure recovery of 96.5% and an adiabatic fan stage efficiency of 87.9%. These values differed meaningfully from the pre-test computational fluid dynamic analysis based design intent. At this operating condition, the effects of inlet-fan coupling extended approximately 0.45 fan diameters upstream into the inlet. The inlet was measured to have a stability margin of approximately 28% and was pre-entry boundary layer separation limited. The fan had approximately 12% of stability margin at 100% corrected speed at which conditions it was flutter limited. It exhibited otherwise flutter free operation over its entire aircraft cruise operating map. Consistently increasing levels of fan stability margin were demonstrated at successively lower fan speeds to in excess of approximately 24% at 80% corrected speed. At each of these reduced speeds, fan stability margin was full annulus stall limited. Inlet airflow distortion remained one-per-rev throughout all tested conditions. At peak efficiency 100% speed test conditions, the boundary layer ingesting inlet airflow had steady state radial and circumferential ARP1420 distortion intensities of 1.2 and 7.2%, respectively. Peak time-variant distortion intensities of 2.3% radial and 8.9% circumferential were also recorded. Comparisons to pre-test computational fluid dynamic predictions are also provided.

A Numerical and Experimental Investigation on Impinging Round Jets in Channel Partially Filled With Porous Media

2017 ◽  
Author(s):  
Bernardo Buonomo ◽  
Luca Cirillo ◽  
Oronzio Manca ◽  
Sergio Nardini
Keyword(s):  
Experimental Investigation ◽  
Porous Media ◽  
Metal Foam ◽  
Fluid Dynamic ◽  
Heated Surface ◽  
Impinging Jets ◽  
Solid Matrix ◽  
Uniform Heat Flux ◽  
Round Jets ◽  
Nusselt Numbers

In this paper a numerical and experimental investigation on impinging jets with metal foam is carried out. The channel is partially filled with porous media. The physical model and geometry has been made considering that the lower impinging surface is heated at uniform heat flux, qw, and the upper surface is adiabatic. The flow is 2D, unsteady, laminar, and incompressible. The distance between the upper confining surface and the lower heated surface is H (40 mm). Fully developed fluid dynamic and thermal flow is assumed at the outlet sections and the fluid is air. The porous material is considered as homogeneous and isotropic. All the thermophysical properties of the fluid and the solid matrix of the porous medium are assumed constant except for the variation in density with the temperature giving rise to the buoyancy forces. Metal foam of 10 PPI is considered. It was investigated many configuration taking into account the ratio s/H and Dj/H. The values of ratio s/H ranging from 0 to 1 while values of the ratio Dj/H raging from 0.3–1.2. Results in terms of wall temperature profiles, local and average Nusselt numbers are presented for different Reynolds values. For the considered parameters, it is obtained that Nusselt number has a weak dependence of Dj/H, in fact, for the ratio equal to 0.3, it is noted that Nu is higher than the ratio equal to 0.6.

scholarly journals Fluid dynamic interaction between train and noise barriers on High-Speed-Lines

2017 ◽  
Vol 199 ◽  
pp. 290-295 ◽  
Author(s):  
Angelo Vittozzi ◽  
Gianluca Silvestri ◽  
Luisa Genca ◽  
Michela Basili
Keyword(s):  
High Speed ◽  
Fluid Dynamic ◽  
Dynamic Interaction ◽  
Noise Barriers

Experimental Investigations on a Hypersonic Nitrogen Flow for Magneto Fluid Dynamic Interaction around a Blunt Body

2011 ◽  
Author(s):  
Andrea Cristofolini ◽  
Carlo Borghi ◽  
Gabriele Neretti ◽  
Federico De Filippis ◽  
Fabio Roveda ◽  
...  
Keyword(s):  
Blunt Body ◽  
Fluid Dynamic ◽  
Dynamic Interaction ◽  
Experimental Investigations ◽  
Nitrogen Flow

scholarly journals Experimental investigation of fluid dynamic instability in a transonic cavity flow

2007 ◽  
Vol 31 (4) ◽  
pp. 333-347 ◽  
Author(s):  
Hiroyuki Hirahara ◽  
Masaaki Kawahashi ◽  
Maksud Uddin Khan ◽  
Kerry Hourigan
Keyword(s):  
Experimental Investigation ◽  
Dynamic Instability ◽  
Fluid Dynamic ◽  
Cavity Flow
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