Structure of the turbulent mixing zone on the boundary of two gases accelerated by a shock wave

1990 ◽  
Vol 26 (3) ◽  
pp. 315-320 ◽  
Author(s):  
E. E. Meshkov ◽  
V. V. Nikiforov ◽  
A. I. Tolshmyakov
Keyword(s):  
Shock Wave ◽  
Turbulent Mixing ◽  
Mixing Zone

scholarly journals Some peculiarities of turbulent mixing growth and perturbations at hydrodynamic instabilities

2013 ◽  
Vol 371 (2003) ◽  
pp. 20120291 ◽  
Author(s):  
N. V. Nevmerzhitskiy
Keyword(s):  
Shock Wave ◽  
Reynolds Number ◽  
Mach Number ◽  
Turbulent Mixing ◽  
Large Scale ◽  
Hydrodynamic Instabilities ◽  
Mixing Zone ◽  
Gaseous Media ◽  
Experimental Works ◽  
Atwood Number

The author presents a review of some experimental works devoted to the research of evolution of large-scale perturbations and turbulent mixing (TM) in liquid and gaseous media during the growth of hydrodynamic instabilities. In particular, it is shown that growth of perturbations and TM in gases is sensitive to the Mach number of shock wave; character of gas front penetration into liquid is not changed as the Reynolds number of flow increases from 5×10 5 to 10 7 ; and change of the Atwood number sign from positive to negative causes stopping of gas front penetration into liquid, but mixing zone width is expanded under inertia.

scholarly journals Experimental and Numerical Investigation of the Growth of an Air/SF6 Turbulent Mixing Zone in a Shock Tube

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
J. Griffond ◽  
J.-F. Haas ◽  
D. Souffland ◽  
G. Bouzgarrou ◽  
Y. Bury ◽  
...  
Keyword(s):  
Shock Wave ◽  
Shock Tube ◽  
Cross Section ◽  
Turbulent Mixing ◽  
Test Chamber ◽  
Weak Dependence ◽  
Mixing Zone ◽  
Nitrocellulose Membrane ◽  
Mesh Spacing ◽  
Zone Growth

Shock-induced mixing experiments have been conducted in a vertical shock tube of 130 mm square cross section located at ISAE. A shock wave traveling at Mach 1.2 in air hits a geometrically disturbed interface separating air and SF6, a gas five times heavier than air, filling a chamber of length L up to the end of the shock tube. Both gases are initially separated by a 0.5 μm thick nitrocellulose membrane maintained parallel to the shock front by two wire grids: an upper one with mesh spacing equal to either ms = 1.8 mm or 12.1 mm, and a lower one with a mesh spacing equal to ml = 1 mm. Weak dependence of the mixing zone growth after reshock (interaction of the mixing zone with the shock wave reflected from the top end of the test chamber) with respect to L and ms is observed despite a clear imprint of the mesh spacing ms in the schlieren images. Numerical simulations representative of these configurations are conducted: the simulations successfully replicate the experimentally observed weak dependence on L, but are unable to show the experimentally observed independence with respect to ms while matching the morphological features of the schlieren pictures.

Dynamical behavior of the Richtmyer–Meshkov instability-induced turbulent mixing under multiple shock interactions

2017 ◽  
Vol 95 (8) ◽  
pp. 671-681 ◽  
Author(s):  
Tao Wang ◽  
Gang Tao ◽  
Jingsong Bai ◽  
Ping Li ◽  
Bing Wang ◽  
...  
Keyword(s):  
Turbulent Mixing ◽  
Compression Wave ◽  
Dynamical Behavior ◽  
Characteristic Scale ◽  
Mixing Zone ◽  
Shock Interactions ◽  
Scale Parameters ◽  
Eddy Simulation ◽  
Negative Exponential ◽  
Multiple Shock

The dynamical behavior of Richtmyer–Meshkov instability-induced turbulent mixing under multiple shock interactions is investigated by large-eddy simulation. After the initial shockwave–interface interaction, the transmitted wave reverberates between the accelerated interface and the end-wall of the shock tube to form a process of multiple shock interactions. The turbulent mixing zone grows in a different manner under each of the impingements. After the initial shock, it grows as a power law of time. After the reshock and the impingement of the reflected rarefaction wave, it grows with time as a different negative exponential law. When the impingement of the reflected compression wave completes, it grows approximately in a linear fashion. The statistical quantities in the turbulent mixing zone evolve with time in a similar way under multiple impingements, and after the impingement of the reflected compression wave, they all decay asymptotically. Therefore, the turbulent mixing zone behaves in a statistically self-similar pattern. Even though the impingements of different waves result in different abrupt changes of the characteristic scale parameters of mixing turbulence, as a whole, the characteristic scales present a feature of growth, and the characteristic-scale Reynolds numbers present a feature of decay. The mixing flow is continuously anisotropic, yet the anisotropy weakens gradually. Therefore the development of turbulent mixing presents a trend of isotropy.

A secondary small-scale turbulent mixing phenomenon induced by shock-wave Mach-reflection slip-stream instability

Shock Waves ◽  
2009 ◽  
pp. 1347-1352 ◽  
Author(s):  
A. Rikanati ◽  
O. Sadot ◽  
G. Ben-Dor ◽  
D. Shvarts ◽  
T. Kuribayashi ◽  
...  
Keyword(s):  
Shock Wave ◽  
Turbulent Mixing ◽  
Mach Reflection ◽  
Small Scale ◽  
Stream Instability

Shock-Wave Mach-Reflection Slip-Stream Instability: A Secondary Small-Scale Turbulent Mixing Phenomenon

2006 ◽  
Vol 96 (17) ◽  
Author(s):  
A. Rikanati ◽  
O. Sadot ◽  
G. Ben-Dor ◽  
D. Shvarts ◽  
T. Kuribayashi ◽  
...  
Keyword(s):  
Shock Wave ◽  
Turbulent Mixing ◽  
Mach Reflection ◽  
Small Scale ◽  
Stream Instability

The Mixing of Turbulent Supersonic Fuel-Air Streams

1965 ◽  
Vol 16 (4) ◽  
pp. 377-387
Author(s):  
J. M. Forde
Keyword(s):  
Mach Number ◽  
Turbulent Mixing ◽  
Integral Form ◽  
Spreading Rate ◽  
External Flow ◽  
Supersonic Combustion ◽  
Mixing Zone ◽  
Mixing Conditions ◽  
Momentum Integral ◽  
Air Streams

SummaryAn integral part of the study of supersonic combustion is the investigation of supersonic turbulent mixing of dissimilar fluids. Experimental results obtained in the course of investigating the turbulent mixing zone between supersonic streams of CO3 and air are presented. Good correlation between observation and available theories has been obtained in terms of the parameter ξ=σy/x. The correlating parameter σ defines the spreading rate of the mixing zone. The available theories, though not developed for these specific conditions, are shown to be applicable to the turbulent mixing of supersonic streams.The correlating parameter σ was determined for three different combinations of internal and external flow Mach numbers. The values found for σ were 18, 16·3, 15·3 for constant external Mach number 1·62 and internal Mach number 1·62, 1·53, 1·47 respectively. The magnitudes of σ showed the expected trend, that is the higher value implies the least divergence of the mixing boundaries.The reasonable agreement with experiment and the simplicity of application of the momentum integral form of solution would appear to favour the use of this approach for the theoretical prediction of the mixing conditions.

Wave structure of turbulent mixing zone

1982 ◽  
Vol 42 (5) ◽  
pp. 500-505
Author(s):  
Ya. A. Vagramenko
Keyword(s):  
Turbulent Mixing ◽  
Wave Structure ◽  
Mixing Zone

Some Two-Dimensional Aspects of the Ejector Problem

1942 ◽  
Vol 9 (4) ◽  
pp. A151-A154 ◽  
Author(s):  
J. A. Goff ◽  
C. H. Coogan
Keyword(s):  
Turbulent Mixing ◽  
Rational Design ◽  
Two Dimensional ◽  
Mixing Zone ◽  
One Dimensional ◽  
Air Stream ◽  
The Right

Abstract Several investigators have attempted to analyze the performance of the ejector on a one-dimensional basis. Some doubt exists whether such analyses can lead to a rational ejector design because of the questionable validity of certain necessary assumptions. Recently, consideration has been given to the two-dimensional aspects of the problem, and while a rational design has not yet been evolved, the results attained seem to point in the right direction. The theory of turbulent mixing in jets, developed by Tollmien is used as the basis of the study reported in this paper. Tollmien’s analysis of the mixing zone produced by a homogeneous air stream issuing into still air of the same pressure and density is reviewed. The authors then extend the theory to allow for the possibility that the driving and driven fluids may have widely different densities.

Sign in / Sign up

Export Citation Format

Share Document