๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

The calculation of thermoacoustic oscillations

โœ Scribed by A.P. Dowling

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
720 KB
Volume
180
Category
Article
ISSN
0022-460X

No coin nor oath required. For personal study only.

โœฆ Synopsis

Thermoacoustic oscillations occur in a wide variety of practical applications in which heat is supplied to an acoustic resonator. A simple geometry is investigated systematically to determine the importance of various flow parameters on the frequency of the oscillations. Detailed consideration of elementary examples shows that the form of the coupling between the heat input and the unsteady flow has a crucial effect on the frequency of oscillation. The same elementary examples are used to compare how well (if at all) different calculation methods in the literature account for this influence. A mean flow and a distributed region of heat input significantly complicate the analysis of thermoacoustic oscillations and are often neglected. Model problems are used to illustrate that mean flow effects can become significant even at modest inlet Mach numbers, and to indicate circumstances under which a distributed heat input may be treated as concentrated.

๐Ÿ“œ SIMILAR VOLUMES

Thermoacoustic oscillations in cryogenic
Thermoacoustic oscillations in cryogenics. Part 3: avoiding and damping of oscillations
โœ H. Luck; Ch. Trepp ๐Ÿ“‚ Article ๐Ÿ“… 1992 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 261 KB

In cryogenics, geometric arrangements and operating conditions are often suitable for the excitement of thermoacoustic (or Taconis) oscillations. The basic geometry of a thermoacoustic oscillator, a half-open tube with high temperature at the closed end and low temperature at the open end, arises fo

Thermoacoustic oscillation in channels o
Thermoacoustic oscillation in channels of the pressurized He II
โœ H Kobayashi; Y Suganuma; H Yoshida; Y Matsubara; A Tominaga ๐Ÿ“‚ Article ๐Ÿ“… 2002 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 152 KB

In channels filled with the pressurized He II at 1 atm, a continuous thermoacoustic oscillation with a clear sound is triggered above the critical power-input q k of the phase transition under some conditions. A temperature distribution along the channel length is entirely maintained as long as the

MEASUREMENT AND ANALYSIS OF THERMOACOUST
MEASUREMENT AND ANALYSIS OF THERMOACOUSTIC OSCILLATIONS IN A SIMPLE DUMP COMBUSTOR
โœ S. DAWSON; J.A. FITZPATRICK ๐Ÿ“‚ Article ๐Ÿ“… 2000 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 134 KB

A study of the spectral characteristics of the temperature, pressure, heat release and velocity #uctuations associated with combustion oscillations has been carried out in a laboratory dump combustor burning premixed butane and air. The interactions between the di!erent #uctuating variables have bee

Experimental investigation on the onset
Experimental investigation on the onset and damping behavior of the oscillation in a thermoacoustic prime mover
โœ G.B Chen; T Jin ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 185 KB

Experiments have been made on the onset and damping behavior of the oscillation in a thermoacoustic prime mover with nitrogen as the working ยฏuids. In contrast to the traditions indicating that the damping point coincide with the onset one, we ยฎnd lags between the onset temperature and the damping t