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Detonation interaction with wedges and bends 总被引:14,自引:0,他引:14
The paper reports the results of a series of studies on the interaction of gaseous detonations with obliquely inclined surfaces.
Interactions of increasing complexity are described in turn: at a planar inclined wall, two-dimensional propagation in a curved
channel and finally three-dimensional interaction with a bend in a cylindrical pipe. The role of detonation structure is discussed
as well as the magnitude and duration of potentially damaging overpressures.
Received 15 December 2000 / Accepted 15 January 2002 相似文献
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The advent of standard algorithms for the numerical solution of partial differential equations has given researchers a new tool for fluid flow calculations. In this paper, single-phase flow in curved ducts is numerically simulated by imposing a spatially varying centrifugal force on a fluid flowing in a straight tube. The resulting set of partial differential equations is solved using the HARWELL-FLOW3D computer program. Comparison with other numerical and experimental results shows that this simplified formulation gives accurate results. The model neglects certain geometric terms of the order d/D, the duct-to-coil diameter ratio. The effect of these terms is investigated by considering the flow in a 90° bend for large d/D. It is shown that while there may be significant error in the prediction of the local variables for large d/D, the circumference-averaged quantities are well predicted. 相似文献
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Ching-Ting Lee Mount-Learn Wu 《Fiber and Integrated Optics》1998,17(3):213-219
A wide-angle low-loss Y-branch waveguide with butterfly-shaped microprisms is designed. The microprisms not only compensate the phase difference but enhance the mode-conversion evolution in the branching region. Simulation results predict that a mode separation with low branching losses can be achieved in the wide-angle Y-branch. The transmitted power efficiency can be as high as 89 % for the branching angle up to 20 . 相似文献
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