Experimental investigation of image degradation created by a high-velocity flow field

1991 ◽  
Author(s):  
L. L. Couch ◽  
David A. Kalin ◽  
Terry McNeal
Keyword(s):  
Experimental Investigation ◽  
Flow Field ◽  
High Velocity ◽  
Image Degradation ◽  
High Velocity Flow ◽  
Velocity Flow

ATOMIZATION CHARACTERISTICS OF LIQUID JETS INJECTED INTO A HIGH-VELOCITY FLOW FIELD

1994 ◽  
Vol 4 (4) ◽  
pp. 451-471 ◽  
Author(s):  
Nobuyuki Yatsuyanagi ◽  
Hiroshi Sakamoto ◽  
Kazuo Sato
Keyword(s):  
Flow Field ◽  
High Velocity ◽  
Liquid Jets ◽  
High Velocity Flow ◽  
Velocity Flow ◽  
Atomization Characteristics

Numerical Simulation of Distribution of Discharged Gas Fire Extinguishing Agent in High Velocity Flow Field

2013 ◽  
Vol 718-720 ◽  
pp. 1786-1791
Author(s):  
Xing Ming Ma ◽  
Lan Ming Zhao ◽  
Yu Nong Li ◽  
Di Di Li ◽  
Jia Jia Fu ◽  
...  
Keyword(s):  
Power Plant ◽  
Flow Field ◽  
Mass Flow Rate ◽  
Flow Rate ◽  
High Velocity ◽  
High Velocity Flow ◽  
Fire Extinguishing ◽  
Velocity Flow ◽  
Civil Aircraft ◽  
Fire Extinguishing System

This paper studied the concentration distribution of gas extinguishing agent numerically in high velocity flow field. Civil aircraft power plant compartment has been a difficult area for its high velocity flow field formed after fire happens. Focusing on this issue, certain results, such as mass flow rate of agent gas, total mass of agent and extinguishing efficiency were presented. A typical apparatus of fire extinguishing system was set up, and its fire-fighting efficiency was evaluated. Critical ratio of mass flow rate and flow velocity, gas discharge time and locations of gas sample tubes were recommended. The results and data can provide a practical way in fire extinguishing system evaluation in civil aircraft power plant compartment.

High-velocity flow in a rough fracture

1999 ◽  
Vol 383 ◽  
pp. 1-28 ◽  
Author(s):  
E. SKJETNE ◽  
A. HANSEN ◽  
J. S. GUDMUNDSSON
Keyword(s):  
Boundary Layer ◽  
Reynolds Number ◽  
Flow Field ◽  
High Velocity ◽  
Average Velocity ◽  
Flow Tube ◽  
Low Velocity ◽  
Viscous Term ◽  
High Velocity Flow ◽  
Velocity Flow

We simulate high-velocity flow in a self-affine channel with a constant perpendicular opening by solving numerically the Navier–Stokes equations, and analyse the resulting flow qualitatively and quantitatively. At low velocity, i.e. vanishing inertia, the effective permeability is dominated by the narrowest constrictions measured perpendicular to the local flow direction and the flow field tends to fill the channel due to the diffusion generated by the viscous term in the Stokes equation. At high velocity (strong inertia), the high-velocity zones of the flow field resemble a narrow tube of essentially constant thickness in the direction of flow, since the transversal diffusion is weak compared to the longitudinal convection. The thickness of the flow tube decreases with Reynolds number. This narrowing in combination with mass balance results in an average velocity in the flow tube which increases faster with Reynolds number than the average velocity in the fracture. In the low-velocity zones, recirculation zones appear and the pressure is almost constant.The flow tube consists of straight sections. This is due to inertia. The local curvature of the main stream reflects the flow-tube/channel-wall interaction. A boundary layer is formed where the curvature is large. This boundary layer is highly dissipative and governs the large pressure loss (inertial resistance) of the medium. Quantitatively, vanishing, weak and strong inertial flow regimes can be described by the Darcy, weak inertia and Forchheimer flow equations, respectively. We observe a cross-over flow regime from the weak to strong inertia, which extends over a relatively large range of Reynolds numbers.

SPECIFIC FEATURES OF DECELERATION OF A HIGH-VELOCITY FLOW IN CONVERGENT FIXED-GEOMETRY INLETS

2017 ◽  
Vol 48 (4) ◽  
pp. 341-355
Author(s):  
Vyacheslav Afanasievich Vinogradov ◽  
Natalya Valeryevna Guryleva ◽  
Mikhail Anatolyevich Ivan'kin ◽  
Vladimir Alekseevich Stepanov
Keyword(s):  
High Velocity ◽  
High Velocity Flow ◽  
Velocity Flow

Closure to “Ippen on High-Velocity Flow”

1951 ◽  
Vol 116 (1) ◽  
pp. 393-400
Author(s):  
Hunter Rouse ◽  
B. V. Bhoota ◽  
En-Yun Hsu
Keyword(s):  
High Velocity ◽  
High Velocity Flow ◽  
Velocity Flow
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