Peripheral Jets in Proximity of the Ground

1966 ◽  
Vol 33 (4) ◽  
pp. 721-727
Author(s):  
M. J. Cohen
Keyword(s):  
High Speed ◽  
Geometric Transformation ◽  
Overall Design ◽  
Design Considerations ◽  
Basic Parameters ◽  
Jet Nozzle ◽  
Compressibility Effects ◽  
Theoretical Standpoint ◽  
Design Guidance ◽  
Jet Curtain

The problem of the performance of a two-dimensional lifting unit with peripheral jet distribution in proximity of the ground is considered fully from a theoretical standpoint but with design considerations in view. The parametral dependence of the lift augmentation characteristic of the unit on a set of three basic parameters—namely, jet thickness, height from the ground, and jet curtain inclination—is examined fully. The effect of raking the jet nozzle exit line on lift is also considered. Compressibility effects in the case of a high-speed jet are briefly commented upon, and overall design guidance lines are suggested. The extension of this analysis to the problem of the peripheral jet with axial symmetry can be performed easily by means of the geometric transformation first suggested by H. R. Chaplin.

Test System for Mechanical Property of Geotextile Material Based on PCI-1714

2012 ◽  
Vol 455-456 ◽  
pp. 217-221
Author(s):  
Zhi Gang Liu ◽  
Qi Xiao Sun
Keyword(s):  
Mechanical Property ◽  
Data Acquisition ◽  
High Speed ◽  
Test System ◽  
Overall Design ◽  
Data Acquisition Software ◽  
Mechanics Performance ◽  
Data Acquisition Card ◽  
High Speed Data Acquisition ◽  
High Speed Data

A solution of intelligent test system for mechanical property of geotextile material which based on high speed data acquisition card PCI-1714 is introduced in this paper. Microprocessor and drive card PCI-1240 are also used to control and drive the test equipment. The article discussed in detail the system’s overall design, the hardware structure, software design, and process of data acquisition. Software is designed by Visual Basic 6.0. This paper research and implement on accurate measurement of mechanics performance of geotextile material.

Cloud Computing Economics

2016 ◽  
pp. 88-111
Author(s):  
Stamatia Bibi ◽  
Dimitrios Katsaros ◽  
Panayiotis Bozanis
Keyword(s):  
Information Technology ◽  
Cloud Computing ◽  
Distributed Computing ◽  
Decision Problem ◽  
High Speed ◽  
Business Case ◽  
Cloud Services ◽  
It Systems ◽  
Basic Parameters ◽  
User Demand

Cloud services and technologies are currently receiving increased attention from the industry mostly due to business-driven promises and expectations. Significant innovations in virtualization and distributed computing, as well as improved access to high-speed Internet and a weak economy, have accelerated interest in cloud computing. However, is the migration to the Cloud the most profitable option for every business? Enterprise adoption of cloud computing often requires a significant transformation of existing Information Technology (IT) systems and processes. To justify such a change, a viable business case must be made based on the economics of transformation. This chapter presents a study of the basic parameters for estimating the potential infrastructure and software costs deriving from building and deploying applications on cloud and on-premise assets. Estimated user demand and desired quality attributes related to an application are also addressed in this chapter as they are aspects of the decision problem that also influence the choice between cloud and in-house solutions.

All-Speed Time-Accurate Underwater Projectile Calculations Using a Preconditioning Algorithm

2005 ◽  
Vol 128 (2) ◽  
pp. 284-296 ◽  
Author(s):  
Michael Dean Neaves ◽  
Jack R. Edwards
Keyword(s):  
High Speed ◽  
Compressible Flows ◽  
Time Derivative ◽  
Water Entry ◽  
Ideal Gas ◽  
Projectile Motion ◽  
Imaging Results ◽  
Underwater Projectile ◽  
Phase Water ◽  
Compressibility Effects

An algorithm based on the combination of time-derivative preconditioning strategies with low-diffusion upwinding methods is developed and applied to multiphase, compressible flows characteristic of underwater projectile motion. Multiphase compressible flows are assumed to be in kinematic and thermodynamic equilibrium and are modeled using a homogeneous mixture formulation. Compressibility effects in liquid-phase water are modeled using a temperature-adjusted Tait equation, and gaseous phases (water vapor and air) are treated as an ideal gas. The algorithm is applied to subsonic and supersonic projectiles in water, general multiphase shock tubes, and a high-speed water entry problem. Low-speed solutions are presented and compared to experimental results for validation. Solutions for high-subsonic and transonic projectile flows are compared to experimental imaging results and theoretical results. Results are also presented for several multiphase shock tube calculations. Finally, calculations are presented for a high-speed axisymmetric supercavitating projectile during the important water entry phase of flight.

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