The effect of a pressure wave on a rigid wall covered with a porous layer

2006 ◽  
Vol 4 ◽  
pp. 156-165 ◽  
Author(s):  
S.V. Lukin
Keyword(s):  
Porous Layer ◽  
Pressure Wave ◽  
Continuum Model ◽  
Solid Wall ◽  
Rigid Wall ◽  
Saturated Liquid ◽  
Wave Processes ◽  
Porous Substance ◽  
Step Type ◽  
Type Pressure

The influence of the non-stationary Basset-Boussinesq forces on the reflection of a step-type pressure wave from a solid surface coated with a porous layer, a saturated liquid or a gas is investigated. The study of wave processes is carried out within the framework of the multi-velocity continuum model. A comparative analysis of the properties of porous screens saturated with a liquid or gas is carried out. The degree of influence of the non-stationary Basset-Boussinesq force on reflection of a wave from a solid wall covered with a porous substance is established.

High-Speed Visualization of the Oscillatory Supersonic Flow Over a Rectangular Cavity

2011 ◽  
Author(s):  
Taro Handa ◽  
Hiroaki Miyachi ◽  
Hatsuki Kakuno ◽  
Takaya Ozaki
Keyword(s):  
Supersonic Flow ◽  
Pressure Wave ◽  
High Speed ◽  
Pressure Oscillation ◽  
Rectangular Cavity ◽  
Schlieren Method ◽  
Trailing Edge ◽  
The Relationship ◽  
Type Pressure ◽  
Semiconductor Type

A mechanism of cavity-induced pressure oscillation in supersonic flows is not well understood in spite of a lot of former investigations. Especially, the process by which the pressure wave is generated and the path of the pressure wave propagating inside the cavity remain unclear. In order to clarify these, the oscillatory behaviors in the supersonic flow over a rectangular cavity are visualized by the schlieren method with a high-speed camera in the present study. The inlet Mach number of the flow is 1.68. The length and depth of the cavity are 14.0mm and 11.7mm respectively; i.e., the length-to-depth ratio of the cavity is 1.20. The pressure oscillation near the trailing edge of the cavity is also measured by use of the semiconductor-type pressure transducer simultaneously with the visualization. As a result, the pressure waves propagating inside as well as outside the cavity are successfully visualized. In addition, the relationship between the shear layer displacement, pressure wave generation and pressure oscillation at the trailing edge of the cavity are clarified experimentally.

Simulation Models of the Complex Type Pressure Wave Supercharger

2016 ◽  
Vol 823 ◽  
pp. 341-346
Author(s):  
Sebastian Radu ◽  
Marius Hârceagă ◽  
Gheorghe Alexandru Radu ◽  
Cristian Leahu ◽  
Horia Abăităncei ◽  
...  
Keyword(s):  
Pressure Wave ◽  
Rotation Speed ◽  
Three Dimensional ◽  
Simulation Models ◽  
Pressure Waves ◽  
Complex Type ◽  
One Dimensional ◽  
Fluent Software ◽  
Type Pressure ◽  
Made In

In order to efficiently supercharge Diesel engines with pressure wave superchargers it is necessary to correlate the superchargers rotation speed with certain parameters of the supercharged engine. For this purpose, to reduce the research costs and duration, simulation models can be used which help to determine the parameters which have a major impact on the supercharger's rotational speed and efficiency. In this paper there are presented two simulation models: a one-dimensional (made in AMESim software) and a three dimensional (made in Fluent Software). This simulation models offer the possibility to visualize some dynamic phenomenon within the supercharger, like the evolution of the pressure waves or the turbulent flow inside the rotor channels. These phenomena are difficult and expensive to study with conventional methods.

scholarly journals Molecular-dynamic investigation of the influence of initial temperature on the character of shock-wave processes in silicon carbide nanocluster

2019 ◽  
Vol 221 ◽  
pp. 01050
Author(s):  
Andrey Utkin ◽  
Vasily Fomin ◽  
Igor Golovnev
Keyword(s):  
Silicon Carbide ◽  
Fracture Process ◽  
Initial Temperature ◽  
Rigid Wall ◽  
Wave Processes ◽  
Impact Interaction ◽  
Wide Range ◽  
The Impact ◽  
Dynamic Investigation ◽  
Dynamics Method

In the present study, using the molecular dynamics method, we investigated the impact interaction of a spherical cluster of 3C-SiC silicon carbide with a rigid wall at a wide range of velocities. The influence of cluster initial temperature on the fracture process was analyzed.

On the expansion of a gas into vacuum

1962 ◽  
Vol 13 (1) ◽  
pp. 101-119 ◽  
Author(s):  
H. P. Greenspan ◽  
D. S. Butler
Keyword(s):  
Spherical Cavity ◽  
Continuum Model ◽  
Rigid Wall ◽  
Uniform Pressure ◽  
Plane Front ◽  
Vacuum Interface

A study is made of the flow into vacuum of a gas initially at rest in a state of uniform pressure and density; the analysis is based on a continuum model. Among the topics discussed are the motion of the gas-vacuum interface, the reflexion of a plane front off a rigid wall, the propagation of compressive waves within such expansions, the escape from a sphere and the collapse of a spherical cavity.

Linear and non-linear compression wave interaction with saturated porous layer

2010 ◽  
Vol 32 (2) ◽  
pp. 71-80
Author(s):  
Amir A. Gubaidulin ◽  
Olga Yu. Boldyreva ◽  
Dina N. Dudko
Keyword(s):  
Porous Medium ◽  
Acoustic Wave ◽  
Porous Layer ◽  
Saturated Porous Medium ◽  
Wave Interaction ◽  
Velocity Model ◽  
Rigid Wall ◽  
Compression Waves ◽  
Non Linear ◽  
Saturated Porous Layer

Features of compression waves propagation in a gas-saturated porous medium have been investigated. The passage of wave from gas to porous medium and its reflection from rigid wall has been studied. The mathematical two-velocity model with two stress tensors has been used. Both non-linear and linear approaches have been employed. Features of acoustic wave transmission in a porous layer and following reflection from obstacle have been investigated. The results of the linear analysis allow us to determine the role of non-linear effects in wave propagation and reflection phenomena in saturated porous media and to interpret the results of acoustic wave interaction with porous layer obtained by experiment or finite-difference method.

Investigation of shock-wave processes in a bubble liquid during the interaction with a barrier

2011 ◽  
Vol 8 ◽  
pp. 17-24
Author(s):  
U.O. Agisheva ◽  
R.Kh. Bolotnova ◽  
M.N. Galimzianov
Keyword(s):  
Experimental Data ◽  
Shock Wave ◽  
Parametric Analysis ◽  
Liquid Mixture ◽  
Solid Wall ◽  
Wave Processes ◽  
Bubble Liquid ◽  
Nitrogen Bubbles

The parametric analysis the process of reflection a shock wave in a gas-liquid mixture from solid wall is conducted. The results are compared with the experimental data for mixture of water and nitrogen bubbles.

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