Results 31 to 40 of about 117 (97)

Numerical Investigation of a Supersonic Wind Tunnel Diffuser Optimization

Aerospace
The objective of this study is to enhance the methodology for the design of a supersonic wind tunnel, improving the process with advanced computational techniques.
Riccardo Nicoletti, Francesco Margani, Luca Armani, Antonella Ingenito, Chihiro Fujio, Hideaki Ogawa, Seoeum Han, Bok Jik Lee   +7 more
doaj   +1 more source

Testing of calibration models in order to certify the overall reliability of the trisonic blowdown wind tunnel of VTI [PDF]

FME Transactions, 2010
It is strongly recommended that wind tunnel calibrations become a regular part of the operational cycle for any wind tunnel. They facilitate tunnel-totunnel data comparisons. Standard calibration model, representing a generic winged missile configuration,
Damljanović Dijana, Rašuo Boško
doaj  

Tree demographics and soil charcoal evidence of fire disturbances in an inaccessible forest atop the Mount Lico inselberg, Mozambique

PLANTS, PEOPLE, PLANET, Volume 7, Issue 1, Page 229-244, January 2025.
Highland forests of Mozambique have been strongly modified by human activities for millennia. Some highlands have sheer rock cliffs and are highly inaccessible to people and appear relatively undisturbed. Evidence from the forest and soils of inaccessible Mount Lico show that the fire regime has changed over the recent millennia.
Colin J. Courtney Mustaphi, Philip J. Platts, Simon Willcock, Jonathan R. Timberlake, Jo Osborne, Hermenegildo Matimele, Hanniah S. Osgood, Veronica M. Muiruri, Maria Gehrels, Julian Bayliss, Rob Marchant   +10 more
wiley   +1 more source

Aerodynamic Losses in Turbines with and without Film Cooling, as Influenced by Mainstream Turbulence, Surface Roughness, Airfoil Shape, and Mach Number

International Journal of Rotating Machinery, Volume 2012, Issue 1, 2012., 2012
The influences of a variety of different physical phenomena are described as they affect the aerodynamic performance of turbine airfoils in compressible, high‐speed flows with either subsonic or transonic Mach number distributions. The presented experimental and numerically predicted results are from a series of investigations which have taken place ...
Phil Ligrani, Ting Wang
wiley   +1 more source

Comparative Natural Gas Venting Pipe Damage Stress Prediction Study Based on Multiple Machine Learning Methods

Advances in Civil Engineering, Volume 2025, Issue 1, 2025.
Stress damage in operational natural gas venting pipes is a complex issue that requires pipeline designs tailored to specific operational conditions. This study aims to accurately predict operational stress during the blow‐off process by leveraging design and operational parameters to assess potential pipeline damage. Five machine learning (ML) methods—
Zhenning Fan, Yuetong Zhang, Wanli Li, ShiLi Shang, Hui He, JianWei Bi, Yuhang Zhang, Hongkun Guo, Yanchao Yue, Monica Santamaria-Ariza   +9 more
wiley   +1 more source

Soil water percolation and nutrient fluxes as a function of topographical, seasonal and soil texture variation in Central Amazonia, Brazil

Hydrological Processes, Volume 38, Issue 4, April 2024.
We collected soil water percolation and nutrient flux at 60 cm depth to understand variability across topographic, soil texture and seasonal gradients within the remote Central Amazon region of Brazil. Main findings indicate percolation volume and solute concentration generally increase with decreasing elevation and clay content.
Jardel Ramos Rodrigues, Kurt C. Solander, Stephen Cropper, Brent D. Newman, Adam D. Collins, Jeffrey M. Warren, Robinson Negron‐Juarez, Bruno O. Gimenez, Gustavo Carvalho Spanner, Valdiek da Silva Menezes, Eduardo Antonio Ríos‐Villamizar, Regison Costa de Oliveira, Sávio José Filgueiras Ferreira, Niro Higuchi   +13 more
wiley   +1 more source

Prediction of total pressure characteristics in the settling chamber of a supersonic blowdown wind tunnel [PDF]

The Aeronautical Journal, 2011
AbstractOccurrence of transient starting and stopping loads during tests at high Mach numbers is one of the major problems in intermittent blowdown wind tunnels. It is believed that in order to overcome this problem, the wind tunnel could be started at a low Mach number and low stagnation pressure; the desired high Mach number condition could be ...
G. K. Suryanarayana, S. R. Bhoi
openaire   +1 more source

Spectral Energy of High-Speed Over-Expanded Nozzle Flows at Different Pressure Ratios

Energies
This paper addresses the long-standing question of understanding the origin and evolution of low-frequency unsteadiness interactions associated with shock waves impinging on a turbulent boundary layer in transonic flow (Mach: 1.1 to 1.3).
Manish Tripathi, Sławomir Dykas, Mirosław Majkut, Krystian Smołka, Kamil Skoczylas, Andrzej Boguslawski   +5 more
doaj   +1 more source

CONTROL OF REYNOLDS NUMBER IN A HIGH SPEED WIND TUNNEL. doi: 10.5028/jatm.2009.01016977

Journal of Aerospace Technology and Management, 2011
A conceptual control model for the Reynolds number test based on isentropic relations was established for the supersonic wind tunnel. Comparison of the system response of the model simulation and the actual wind tunnel test data was made to design the ...
Maurício G. Silva, Vitor O.R. Gamarra, Vitor Koldaev   +2 more
doaj  

Shock loss measurements in non-ideal supersonic flows of organic vapors. [PDF]

Exp Fluids, 2022
Conti CC, Fusetti A, Spinelli A, Guardone A.   +3 more
europepmc   +1 more source