Computational study of high-speed plasma flow impinging on an enthalpy probe

1996 ◽  
Vol 16 (1) ◽  
pp. 17-38 ◽  
Author(s):  
C. H. Chang ◽  
J. D. Ramshaw
Keyword(s):  
Plasma Flow ◽  
High Speed ◽  
Computational Study ◽  
Enthalpy Probe

scholarly journals Experimental and Computational Study of Trapped Vortex Combustor Sector Rig with High-Speed Diffuser Flow

2001 ◽  
Vol 7 (6) ◽  
pp. 375-385 ◽  
Author(s):  
R. C. Hendricks ◽  
D. T. Shouse ◽  
W. M. Roquemore ◽  
D. L. Burrus ◽  
B. S. Duncan ◽  
...  
Keyword(s):  
Gas Turbine ◽  
High Speed ◽  
Fuel Injection ◽  
Computational Study ◽  
Combustion Efficiency ◽  
Flame Stabilization ◽  
Performance Data ◽  
Pollutant Emissions ◽  
Choked Flow ◽  
Trapped Vortex

The Trapped Vortex Combustor (TVC) potentially offers numerous operational advantages over current production gas turbine engine combustors. These include lower weight, lower pollutant emissions, effective flame stabilization, high combustion efficiency, excellent high altitude relight capability, and operation in the lean burn or RQL modes of combustion. The present work describes the operational principles of the TVC, and extends diffuser velocities toward choked flow and provides system performance data. Performance data include EINOx results for various fuel-air ratios and combustor residence times, combustion efficiency as a function of combustor residence time, and combustor lean blow-out (LBO) performance. Computational fluid dynamics (CFD) simulations using liquid spray droplet evaporation and combustion modeling are performed and related to flow structures observed in photographs of the combustor. The CFD results are used to understand the aerodynamics and combustion features under different fueling conditions. Performance data acquired to date are favorable compared to conventional gas turbine combustors. Further testing over a wider range of fuel-air ratios, fuel flow splits, and pressure ratios is in progress to explore the TVC performance. In addition, alternate configurations for the upstream pressure feed, including bi-pass diffusion schemes, as well as variations on the fuel injection patterns, are currently in test and evaluation phases.

An Experimental and Analytical Study of the Dynamic Response of a Linkage Fabricated from a Unidirectional Fiber-Reinforced Composite Laminate

1983 ◽  
Vol 105 (3) ◽  
pp. 526-533 ◽  
Author(s):  
B. S. Thompson ◽  
D. Zuccaro ◽  
D. Gamache ◽  
M. V. Gandhi
Keyword(s):  
High Speed ◽  
Computational Study ◽  
Continuum Theory ◽  
Elastic Solid ◽  
Fiber Reinforced ◽  
Element Analysis ◽  
High Productivity ◽  
Orthotropic Properties ◽  
Fiber Reinforced Material ◽  
Four Bar Linkage

A large class of industrial machinery and commercial equipment is operated at high speed to satisfy the demands for high productivity. In order to further improve performance, it is proposed herein that the designer should consider fabricating the mechanism components in one of the commercially available composite materials because they offer many desirable characteristics with the promise of even higher speeds of operation. This paper presents an experimental and computational study of a flexible planar four-bar linkage fabricated from one of these composites. This fiber-reinforced material is modeled as an elastic solid by using a continuum theory which accommodates laminae with orthotropic properties, and differing densities, thicknesses, and elastic moduli. The theory is embodied in a variational theorem which serves as the basis for a finite element analysis of the mechanism.

scholarly journals High-speed Plasma Flow in a Cusped Magnetic Field

1966 ◽  
Vol 18 (1) ◽  
pp. 1-18
Author(s):  
Masatoshi Tanaka
Keyword(s):  
Magnetic Field ◽  
Plasma Flow ◽  
High Speed

scholarly journals Experimental analysis on the characteristics of enthalpy probe immersed in arc plasma flow

2010 ◽  
Vol 38 (12) ◽  
pp. 1240-1246
Author(s):  
Jun-Ho Seo ◽  
Jun-Seok Nam ◽  
Seong-Man Choi ◽  
Bong-Gun Hong ◽  
Sang-Hee Hong
Keyword(s):  
Plasma Flow ◽  
Experimental Analysis ◽  
Arc Plasma ◽  
Enthalpy Probe

scholarly journals Impact and Ricochet of a High Speed Projectile from a Plate

2021 ◽  
Vol 71 (6) ◽  
pp. 737-747
Author(s):  
Hussein Bassindowa ◽  
Bakhtier Farouk ◽  
Steven B. Segletes
Keyword(s):  
Titanium Alloy ◽  
High Speed ◽  
Computational Study ◽  
Incident Angle ◽  
Finite Thickness ◽  
Impact Angle ◽  
Projectile Velocity ◽  
Alloy Plate ◽  
Impact Angles ◽  
The Impact

A computational study of a projectile (either 2024 aluminum or TiAl6V4 titanium alloy) impacting a plate (either titanium alloy or aluminum) is presented in this paper. Projectile velocity (ranging from 250 m/s to 1500 m/s) with varying impact angles are considered. The presence of ricochet (if any) is identified over the ranges of the projectile velocity and impact angle considered. For the cases where ricochet is identified, the ricochet angle and velocity are predicted as functions of the incident angle and the incident velocity. The numerical results are compared with an analytical solution of the ricochet problem. The analytical solutions are from a model developed to predict the ballistic ricochet of a projectile (projectile) penetrator. The dynamics and the deformation of an aluminum (or a titanium alloy) projectile impacting on a finite thickness titanium alloy (or aluminum) plate are simulated. The current work is interesting in that it looks in the field of ballistics of different material combinations than are traditionally studied. The present simulations based on detailed material models for the aluminum and the titanium alloy and the impact physics modelling features in the LS-DYNA code provide interesting details regarding the projectile/plate deformations and post-impact projectile shape and geometry. The present results indicate that for no cases (for specified incoming velocities and impact angles considered) can an aluminum projectile penetrate a titanium alloy plate. The ricochet ‘mode predictions ‘obtained from the present simulations agree well with the ricochet ‘mode predictions’ given in an analytical model.

High-speed helmeted head impacts in motorcycling: A computational study

2020 ◽  
Vol 134 ◽  
pp. 105297
Author(s):  
Shiyang Meng ◽  
Alessandro Cernicchi ◽  
Svein Kleiven ◽  
Peter Halldin
Keyword(s):  
High Speed ◽  
Computational Study ◽  
Head Impacts

A Computational Study on Structural Barrier to Vertical Spread of Window Spill Plume along Building Exterior Façade under External Wind

2014 ◽  
Vol 501-504 ◽  
pp. 2392-2398
Author(s):  
Nan Zhao ◽  
Jing Yan Zhang ◽  
Xue Fei Xing
Keyword(s):  
High Speed ◽  
Computational Study ◽  
Fire Simulation ◽  
Simulation Experiments ◽  
Low Speed ◽  
High Rise ◽  
Numerical Fitting ◽  
Structural Barrier ◽  
Different Dimensions ◽  
Major Factors

External wind is one of the major factors that influence the spread of fire along building exterior facade in high-rise buildings. Fire simulation experiments are conducted .First, under two circumstances of low-speed and high-speed side-blown wind, observing barrier of window spill plume along building exterior facade under different dimensions of windows, windowsill walls and balconies. Then the correlation between smoke temperature near the exterior facade and dimensions of window, windowsill wall and balcony is obtained by numerical fitting and dimensional analyses. The correlation indicates that, on low-speed side-blown wind, spill plume spreading diagonal up downwind, balcony width plays a leading barrier; on high-speed side-blown wind, spill plume horizontal spreading downwind, balcony extension plays a leading barrier.

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