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- W2006286603 abstract "Systematic measurements in the isothermal mixing of co-axial laminar flows of air, using a technique of flow visualization and hot-wire annemometry, have established the presence of Tollmien-Schlichting waves in the flow field. The measured properties of these waves agree with published experimental and theoretical results on the stability of the two-dimensional boundary layer and of parallel mixing. Measurements in enclosed axi-symmetrical diffusion flames have shown that a complex disturbance with frequencies of less than 60 Hz is present near the tip of the central tube. One of these components, whose frequency is close to that of the natural frequency of the system, is selectively amplified and, at a critical relative flow of air to fuel, the amplitude of the disturbance is just sufficient to drive the flame into vibration. At higher relative flow rates, both the amplitude and frequency of vibration increase. Phase-angle measurements in the flow field of steady or vibrating diffusion flames confirm the presence of periodic travelling waves. The wave front is not plane near the wave surface where steep temperature and velocity gradients are present. That these are coupled in some manner is evident from a comparison of the experimental data with higher order solutions of the Orr-Sommerfeld equation. The wave propagation velocity is of the order 103 smaller than that of the fundamental acoustic wave in the medium although the frequencies are equal. The precise nature of this coupling has not yet been resolved. The properties of the waves in the presence of a flame are qualitatively similar to those in isothermal mixing. There are three modes of steady flame vibrations, and the transition from one mode to the next is discontinuous. Rayleigh's hypothesis has been expressed in terms of upper and lower limits of the frequency of flame vibration, and has been verified for the three modes." @default.
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- W2006286603 date "1971-01-01" @default.
- W2006286603 modified "2023-09-28" @default.
- W2006286603 title "The mechanism of vibration in enclosed laminar diffusion flames" @default.
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- W2006286603 doi "https://doi.org/10.1016/s0082-0784(71)80052-8" @default.
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