49,743 research outputs found
Computation of H2/air reacting flowfields in drag-reduction external combustion
Numerical simulation and analysis of the solution are presented for a laminar reacting flowfield of air and hydrogen in the case of external combustion employed to reduce base drag in hypersonic vehicles operating at transonic speeds. The flowfield consists of a transonic air stream at a Mach number of 1.26 and a sonic transverse hydrogen injection along a row of 26 orifices. Self-sustained combustion is computed over an expansion ramp downstream of the injection and a flameholder, using the recently developed RPLUS code. Measured data is available only for surface pressure distributions and is used for validation of the code in practical 3D reacting flowfields. Pressure comparison shows generally good agreements, and the main effects of combustion are also qualitatively consistent with experiment
Synchronization of Chaotic Maps by Symmetric Common Noise
Synchronization of identical chaotic systems subjected to common noise has
been the subject of recent research. Studies on several chaotic systems have
shown that, the synchronization is actually induced by the non-zero mean of the
noise, and symmetric noise with zero-mean cannot lead to synchronization. Here
it is presented that synchronization can be achieved by {\sl zero-mean} noise
in some chaotic maps with large convergence regions.Comment: 5 pages, 4 figure
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