Download e-book for kindle: Advances in Turbulence VII: Proceedings of the Seventh by S. Fauve, S. Aumaitre, P. Abry, J.-F. Pinton, R. Labbe

By S. Fauve, S. Aumaitre, P. Abry, J.-F. Pinton, R. Labbe (auth.), Uriel Frisch (eds.)

ISBN-10: 9401061513

ISBN-13: 9789401061513

ISBN-10: 9401151180

ISBN-13: 9789401151184

Advances in Turbulence VII includes an outline of the nation of turbulence learn with a few bias in the direction of paintings performed in Europe. It represents a virtually whole number of the invited and contributed papers added on the 7th ecu Turbulence convention, subsidized via EUROMECH and ERCOFTAC and arranged by means of the Observatoire de los angeles Côte d'Azur. New high-Reynolds quantity experiments mixed with new thoughts of imaging, non-intrusive probing, processing and simulation offer top of the range information which positioned major constraints on attainable theories. For the 1st time, it's been proven, for a category of passive scalar difficulties, why dimensional research occasionally provides the inaccurate solutions and the way anomalous intermittency corrections may be calculated from first rules. the quantity is therefore geared in the direction of experts within the region of circulate turbulence who couldn't attend the convention in addition to anyone attracted to this speedily relocating box.

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Extra resources for Advances in Turbulence VII: Proceedings of the Seventh European Turbulence Conference, held in Saint-Jean Cap Ferrat, France, 30 June – 3 July 1998 / Actes de la Septième Conférence Européenne de Turbulence, tenue à Saint-Jean Cap Ferrat, France, 30 Juin

Example text

The flow configuration, representative of the experiments, consists simply of two superposed uniform streams of velocity Ui , (j= I liquid, j=2 gas) and densities Pi which are joined by a boundary layer in the gas of constant vorticity thickness O2 • The dispersion relation for this configuration can be derived following Chandrasekhar (1961) neglecting viscosity, gravity and surface tension effects. The amplification rate as a function of wave number has been determined for values of S= piPI ranging from 1 to 10-3 and for large values of the velocity ratio U/U I (Raynal et aI, 1998).

Optical methods were used to observe the flame and plume above it. We have observed the transition from a steady flame, with the plume above it exhibiting a helical instability at low flow rates, to an axisymmetric instability at a well defined frequency, of the whole flame and the lower part of the plume, at higher flow rates. In the case of burners made of straight, constant-diameter tubing, with the fuel injected vertically, the frequency and flow rate at onset of oscillation agreed with previous measurements.

It is concluded that the instability introduced by the secondary vorticity wrapping around the core leads to transition. Thus, secondary effects are important and secondary vorticity must be recognised and accounted for. The effects of secondary vorticity from the piston face can be eliminated by having the piston face finishing position far from the inside wall. Piston face vorticity is of particular concern at high Impulse Ratios since the strength of the secondary ring is a function of the piston stroke length.

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Advances in Turbulence VII: Proceedings of the Seventh European Turbulence Conference, held in Saint-Jean Cap Ferrat, France, 30 June – 3 July 1998 / Actes de la Septième Conférence Européenne de Turbulence, tenue à Saint-Jean Cap Ferrat, France, 30 Juin by S. Fauve, S. Aumaitre, P. Abry, J.-F. Pinton, R. Labbe (auth.), Uriel Frisch (eds.)


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