منابع مشابه
Temperature response of turbulent premixed flames to inlet velocity oscillations
Flame–turbulence interactions are at the heart of modern combustion research as they have a major influence on efficiency, stability of operation and pollutant emissions. The problem remains a formidable challenge, and predictive modelling and the implementation of active control measures both rely on further fundamental measurements. Model burners with simple geometry offer an opportunity for ...
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We show how an island (isola) evolves out of the usual S-curve of steady states of diffusion flames when radiation losses are accounted for and how it eventually disappears when radiation increases further. At small activation temperatures there are never any islands. We show that stable oscillations evolve first out of perturbations of steady states on the S-curve at large Damköhler numbers. O...
متن کاملNonlinear Resonant Oscillations of Gas in Optimized Acoustical Resonators and the Effect of Central Blockage
Optimizing resonator shapes for maximizing the ratio of maximum to minimum gas pressure at an end of the resonator is investigated numerically. It is well known that the resonant frequencies and the nonlinear standing waveform in an acoustical resonator strongly depend on the resonator geometry. A quasi-Newton type scheme was used to find optimized axisymmetric resonator shapes achieving the ma...
متن کاملExperimental investigation of the nonlinear response of turbulent premixed flames to imposed inlet velocity oscillations
This paper describes an experimental investigation of acoustically forced lean premixed turbulent bluff-bodystabilised flames in an enclosure short enough so that no coupling of the combustor downstream acoustics occurred for the frequencies studied here, which allows an unambiguous examination of the flame response to inlet velocity fluctuations. Special emphasis was placed on the amplitude de...
متن کاملComment on "Acoustical observation of bubble oscillations induced by bubble popping".
We have reproduced the experiment of acoustic monitoring of spontaneous popping of single soap bubbles standing in air reported by Ding et al. [2aaPhys. Rev. E 75, 041601 (2007)]. By using a single microphone and two different signal acquisition systems recording in parallel the signal at the microphone output, among them the system used by Ding et al., we have experimentally evidenced that the...
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ژورنال
عنوان ژورنال: Science
سال: 1953
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.117.3038.3