Self-Excited Oscillations and Mixing in a Hot Jet

Numerical Simulation of Mixing Enhancement in a Hot Supersonic Jet

Experimental observations show that the presence of small tabs on the edge of a hot, compressible jet exiting into a slower moving, colder ambient ow can increase the rate of spreading of the jet. This suggests that the rate of mixing of the jet and the ambient uid is also increased. In order to elucidate the physical mechanism responsible for the increased spreading rate a set of calculations ...

Nonlinear self-excited oscillations in a thermoacoustic system

Lipika Kabiraj, R. I. Sujith, Pankaj Wahi † ‡ Department of Aerospace Engineering Indian Institute of Technology Madras Chennai 600036, India [email protected], [email protected] Department of Mechanical Engineering Indian Institute of Technology Kanpur Kanpur-208016, India [email protected] ABSTRACT Spontaneous pressure and heat release rate oscillations can get excited in a confined combu...

SELF-EXCITED OSCILLATIONS : from Poincare to Andronov

High-frequency self-excited oscillations in a collapsible-channel flow

High-Reynolds-number asymptotics and numerical simulations are used to describe twodimensional, unsteady, pressure-driven flow in a finite-length channel, one wall of which contains a section of membrane under longitudinal tension. Asymptotic predictions of stability boundaries for small-amplitude, high-frequency, self-excited oscillations are derived in the limit of large membrane tension. The...

Experimental study of self-sustained oscillations in a confined jet.

A. Maurel, P. Ern, B. J. A. Zielinska, and J. E. Wesfreid Laboratoire de Physique et Mécanique des Milieux Hétérogènes URA CNRS 857, Ecole de Physique et Chimie Industrielles de Paris (ESPCI), 10 rue Vauquelin, 75231 Paris Cedex 05, France Schlumberger Industries/Gas Engineering Montrouge, Boite Postale 620 05-92 542 Montrouge, Cedex, France ~Received 3 January 1995; revised manuscript received...