Unexpected transverse velocity component of Xe+ ions near the exit plane of a Hall thruster

2010 ◽  
Vol 17 (11) ◽  
pp. 113502 ◽  
Author(s):  
G. Bourgeois ◽  
S. Mazouffre ◽  
N. Sadeghi
Keyword(s):  
Velocity Component ◽  
Transverse Velocity ◽  
Hall Thruster ◽  
Exit Plane ◽  
Transverse Velocity Component

scholarly journals Fragmentation Behaviour of Radial Layered PELE Impacting Thin Metal Target Plates

2018 ◽  
Vol 68 (5) ◽  
pp. 505-511 ◽  
Author(s):  
Chun Cheng ◽  
Xi Chen ◽  
Zhonghua Du ◽  
Jilong Han ◽  
Chengxin Du ◽  
...  
Keyword(s):  
Impact Velocity ◽  
Velocity Component ◽  
Steel Plate ◽  
Transverse Velocity ◽  
Thin Metal ◽  
Metal Target ◽  
Fragmentation Mechanism ◽  
Target Plate ◽  
Transverse Velocity Component ◽  
The Impact

The fragmentation mechanism of the penetrator with lateral effect (PELE) after perforating a thin target plate has been summarised and analysed firstly. Then the fragmentation of radial layered PELE was analysed qualitatively and verified by experiment. In the experiment, the target plates were made of 45# steel and 2A12 aluminium respectively. Qualitative analysis and experimental results show that: for normal PELE without layered, after perforating the thin metal target plate, from the bottom to the head of the projectile, the number of fragments formed by the jacket gradually increases, and the mass of the fragment decreases correspondingly. Compared with the normal PELE without layered, the radial layered PELE is less likely to break into fragments, when impacting the thin metal target plate with the same material and thickness under the same impact velocity. However, from the mechanism of the PELE, when the resistance of the target plate is large enough, and the duration of pressure is long enough, the radial layered PELE also can break into fragments with transverse velocity component. The resistance of the target plate plays an important role in the fragmentation of radial layered PELE. The radial layered PELE produced massive fragments with transverse velocity component when impacting the 45# steel plate with5 mm thickness under the impact velocity of 657.2 m/s.

The limiting behaviour of the turbulent transverse velocity component close to a wall

1970 ◽  
Vol 44 (3) ◽  
pp. 605-614 ◽  
Author(s):  
Kamalesh K. Sirkar ◽  
Thomas J. Hanratty
Keyword(s):  
Distribution Function ◽  
Frequency Response ◽  
Velocity Gradient ◽  
Velocity Component ◽  
Transverse Velocity ◽  
Electrochemical Techniques ◽  
Amplitude Distribution ◽  
Mean Flow ◽  
Transverse Velocity Component ◽  
Limiting Behaviour

Electrochemical techniques are used to measure the circumferential component of the velocity gradient sz at the wall of a pipe through which a turbulent fluid is flowing. The ratio of the root-mean-squared value of sz to the time-averaged velocity gradient is found to be 0·09 or 0·1, depending on whether corrections are made for frequency response. The frequency spectrum is similar to that for the component of the wall velocity gradient in the direction of mean flow. The amplitude distribution function for sz is very roughly approximated by a Gaussian distribution.

NUMERICAL STUDY OF THE WAVE INSTABILITY PROBLEM WITH THE EFFECT OF THE TRANSVERSE VELOCITY COMPONENT TEX SYSTEM

2001 ◽  
Vol 09 (03) ◽  
pp. 1055-1065
Author(s):  
B. S. ATTILI
Keyword(s):  
Finite Difference ◽  
Difference Scheme ◽  
Velocity Component ◽  
Finite Difference Scheme ◽  
Numerical Study ◽  
Transverse Velocity ◽  
Numerical Results ◽  
Wave Instability ◽  
Transverse Velocity Component ◽  
Instability Problem

We will numerically investigate the wave instability problem with the effect of the transverse velocity component. An accurate and easy to program finite difference scheme will be developed for this purpose. The eigenfunctions will be normalized and computed simultaneously with the eigenvectors. Numerical results will also be presented.

scholarly journals RESEARCH ON THE EFFECT OF THE INITIAL SPEED OF THE MIXTURE ON THE PROCESS OF LOADING

2019 ◽  
pp. 47-55
Author(s):  
Piven Mykhailo
Keyword(s):  
Surface Area ◽  
Velocity Component ◽  
Initial Velocity ◽  
Surface Density ◽  
Transverse Velocity ◽  
Longitudinal Velocity ◽  
Specific Load ◽  
Longitudinal Velocity Component ◽  
Transverse Velocity Component ◽  
Specific Loading

The work is devoted to the study of the influence of the initial velocity of the loose mixture on the loading process of the vibrating sieve. The regularities of layer thickness, longitudinal and transverse components of velocity, density of loose mixture and specific load on the entire area of a vibrating sieve are established. When the initial velocity is less than velocity of the mixture movement on the sieve is the thickness of the layer has become over the entire surface area, the surface density of the mixture decreases, and the longitudinal velocity component increases with length. The transverse velocity component contributes to the rapid redistribution of the mixture from the congested central area to the unloaded lateral ones. When the initial velocity is equal to the velocity of the mixture movement on the sieve, the thickness of the layer and the surface density of the mixture are constant on the surface area, the longitudinal velocity component is constant along the length and has an initial velocity profile along the width of the sieve, which is aligned with the length. The transverse velocity component decreased and the specific loading deviations increased. When the initial velocity is greater than the velocity of the mixture movement on the sieve, the thickness of the layer decreases, the surface density of the mixture increases, and the longitudinal velocity component decreases with length. The transverse velocity component is almost absent, the specific loading is uneven throughout the sieve area. Thus, the value of the initial velocity affects all the characteristics of the loose mixture, and the nature of changing some of them turns to the opposite. When the mixture is unevenly fed across the width at the inlet of the sieve, the increase of the initial velocity increases the uneven distribution of the specific load over the area of the work surface. The regularities of distribution of the specific load of the sieve are decisive in the design of feeders and distributors of loose mixtures, as well as in calculation of separation modes.

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