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Critical deflagration waves leading to detonation onset under different boundary conditions

Chinese Physics B 2015年第1期24卷 361-368页

作者：林伟周进范孝华林志勇 Science and Technology on Scramjet Laboratory National University of Defense Technology China Aerodynamics Research & Development Center

High-speed turbulent critical deflagration waves before detonation onset in H2–air mixture propagated into a square cross section channel, which was assembled of optional rigid rough, rigid smooth, or flexible walls. The corresponding propagation characteristic and the influence of the wall boundaries on the propagation were investigated via high-speed shadowgraph and a high-frequency pressure sampling system. As a comprehensive supplement to the different walls effect investigation, the effect of porous absorbing walls on the detonation propagation was also investigated via smoke foils and the high-frequency pressure sampling system. Results are as follows. In the critical deflagration stage, the leading shock and the closely following turbulent flame front travel at a speed of nearly half the CJ detonation velocity. In the preheated zone, a zonary flame arises from the overlapping part of the boundary layer and the pressure waves, and then merges into the mainstream flame. Among these wall boundary conditions, the rigid rough wall plays a most positive role in the formation of the zonary flame and thus accelerates the transition of the deflagration to detonation（DDT）, which is due to the boost of the boundary layer growth and the pressure wave reflection. Even though the flexible wall is not conducive to the pressure wave reflection, it brings out a faster boundary layer growth, which plays a more significant role in the zonary flame formation. Additionally, the porous absorbing wall absorbs the transverse wave and yields detonation decay and velocity deficit. After the absorbing wall, below some low initial pressure conditions, no re-initiation occurs and the deflagration propagates in critical deflagration for a relatively long distance.

关键词： critical deflagration waves wall boundary condition zonary flame pressure waves

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pressure FLUCTUATIONS IN GAS-SOLIDS FLUIDIZED BEDS

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China Particuology 2003年第4期1卷 139-144页

作者： Hsiaotao Bi Fluidization Research Centre Department of Chemical and Biological Engineering University of British Columbia 2216 Main Mall Vancouver BC V6T 1Z4 Canada

pressure fluctuation data measured in a series of fluidized beds with diameters of 0.05, 0.1, 0.29, 0.60 and 1.56 m showed that the maximum amplitude or standard deviation increased with increasing the superficial gas velocity and static bed height for relatively shallow beds and became insensitive to the increase in static bed height in relatively deep beds. The amplitude appeared to be less dependent on the measurement location in the dense bed. Predictions based on bubble passage, bubble eruption at the upper bed surface and bed oscillation all failed to explain all observed trends and underestimated the amplitude of pressure fluctuations, suggesting that the global pressure fluctuations in gas-solids bubbling fluidized beds are the superposition of local pressure variations, bed oscillations and pressure waves generated from the bubble formation in the distributor region, bubble coalescence during their rise and bubble eruption at the upper bed surface.

关键词： bubbling fluidized beds pressure fluctuations maximum pressure amplitude pressure waves scaleup effect

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pressure wave propagation in full-body arterial models:a gateway to exploring aging and hypertension

Pressure wave propagation in full-body arterial models:a gat...

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23rd International Congress of Theoretical and Applied Mechanics

作者： C.Alberto Figueroa Jay D.Humphrey Department of Biomedical Engineering King's College LondonLondonUK Department of Biomedical Engineering Yale UniversityNew HavenCTUSA

＜正＞It is now recognized that changes in arterial stiffness have an impact on hemodynamic indices such as pressure pulse amplification and pulse wave *** is also becoming evident that changes in wall mechanics may p... 详细信息

ISBN: (纸本)9781632663696

关键词： Pulse wave velocity Fluid-structure interaction Hypertension Full-body arterial model Three-dimensional hemodynamics Hypertension Pulse Wave Velocity pressure Arteries fluid-solid interactions wave propagation Hemodynamics pressure waves doorways Blood Flow Blood Circulation

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Numerical Modelling of Aerodynamic Noise in Compressible Flows

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Open Journal of Fluid Dynamics 2012年第3期2卷 65-69页

作者： Slawomir Dykas Sebastian Rulik Wlodzimierz Wroblewski Institute of Power Engineering and Technology Silesian University of TechnologyGliwicePoland

The solution of the AeroAcoustics (CAA) problems by means of the Direct Numerical Simulation (DNS) or even the Large Eddy Simulation (LES) for a large computational domain is very time consuming and cannot be applied widely for engineering applications. In this paper the in-house CFD and CAA codes are presented. The in-house CFD code is based on the LES approach whereas the CAA code is an acoustic postprocessor solving the non-linearized Euler equations for fluctuating (acoustic) variables. These codes are used to solve the aerodynamically generated sound field by a flow over a rectangular cavity with inlet Mach number 0.53.

关键词： Computational Aeroacoustics Noise pressure waves Cavity Noise

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