Journal ArticleDOI
Model for entropy production and pressure variation in confined turbulent mixing
TLDR
In this article, a quasi-one-dimensional model for the planar, confined shear layer is constructed with the purpose of obtaining estimates of entropy production and pressure variation due to turbulent mixing.Abstract:
A quasi-one-dimensional model for the planar, confined shear layer is constructed with the purpose of obtaining estimates of entropy production and pressure variation due to turbulent mixing. The turbulent Prandtl and Lewis numbers are assumed to be unity. It is found that entropy production is strongly coupled to the intrinsic compressibility, with total pressure losses becoming significant as the convective Mach number increasesread more
Citations
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Noise Measurements in Supersonic Jets Treated with the Mach Wave Elimination Method
TL;DR: In this paper, the authors report noise measurements for perfectly expanded coaxial jets composed of a supersonic primary stream at velocity of 920 m/s and a coflow stream at conditions designed to prevent formation of Mach waves.
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Numerical Study of Compressible Mixing Layers Using High-Order WENO Schemes
TL;DR: High resolution simulations using fifth-order weighted essentially non-oscillatory (WENO) schemes with a third-order TVD Runge-Kutta method to examine the features of turbulent mixing layers find the Bandwidth-optimized WENO scheme with total variation relative limiters is found to be less dissipative than the classical WenO scheme, but prone to exhibit some dispersion errors in relatively coarse meshes.
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Analysis of partially mixed supersonic ejector
TL;DR: In this article, an analytical model of a supersonic/subsonic, constant-area ejector whose exit flow is not uniformly mixed is presented, where the primary and secondary streams, separated by the dividing streamline, are treated as quasi-one-dim ensional.
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The high-energy-density counterpropagating shear experiment and turbulent self-heating
TL;DR: The counter-propagating shear experiment has previously demonstrated the ability to create regions of shock-driven shear, balanced symmetrically in pressure, and experiencing minimal net drift as discussed by the authors.
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Noise from Imperfectly Expanded Supersonic Coaxial Jets
TL;DR: In this paper, the effect of annular secondary e ow on noise emission was investigated and the effects of an annular SFO on the performance of axisymmetric high-speed jets at a variety of Mach numbers and velocities and at pressure-matched, overexpanded, and underexpanded conditions.
References
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Book
The Structure of Turbulent Shear Flow
TL;DR: In this paper, the authors present a method to find the optimal set of words for a given sentence in a sentence using the Bibliogr. Index Reference Record created on 2004-09-07, modified on 2016-08-08
Journal ArticleDOI
On density effects and large structure in turbulent mixing layers
Garry L. Brown,Anatol Roshko +1 more
TL;DR: In this article, Spark shadow pictures and measurements of density fluctuations suggest that turbulent mixing and entrainment is a process of entanglement on the scale of the large structures; some statistical properties of the latter are used to obtain an estimate of entrainedment rates, and large changes of the density ratio across the mixing layer were found to have a relatively small effect on the spreading angle.
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The compressible turbulent shear layer: an experimental study
TL;DR: In this paper, the growth rate and turbulent structure of the compressible, plane shear layer are investigated experimentally in a novel facility, where it is possible to flow similar or dissimilar gases of different densities and to select different Mach numbers for each stream.
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Turbulent Boundary Layer in Compressible Fluids
TL;DR: In this paper, a general formula for skin friction, including heat transfer to a flat plate, was developed for a thin turbulent boundary layer in compressible fluids with zero pressure gradient, and curves were presented giving skin-friction coefficients and heat-transfer coefficients for air for various wall-to-free-stream temperature ratios and free-stream Mach Numbers.
Journal ArticleDOI
The two-dimensional mixing region
Israel Wygnanski,H. E. Fiedler +1 more
TL;DR: In this paper, the mixing region can be divided into two regions, one on the outer part of a wake and the other on the low velocity side which resembles a jet, and the turbulent energy balance was constructed twice using the conventional results and again using the turbulent zone results.