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Predictions of bulk velocity for open channel flow through submerged vegetation

Journal of Hydrodynamics 2020年第4期32卷 795-799页

作者： Wei-jie Wang Xiao-yu Cui Fei Dong Wen-qi Peng Zhen Han Ai-ping Huang Xue-kai Chen Yuan Si State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 10003&China Department of Water Ecology and Environment China Institute of Water Resources and Hydropower ResearchBeijing 100038China

Vegetation is of great significance in river ecosystems in terms of hydrodynamics,water environment and *** question of how to predict the bulk velocity in channel flow through submerged vegetation is currently a hot topic in hydraulics *** present study addresses this *** various formulae used for bulk velocity estimation in previous work were reviewed and *** main novelty of this paper is that a new expression of friction factor is proposed as a function of two dimensionless factors,and the number of tuning parameters is less than that in previous work.A comparison of measured and calculated data was conducted for flow through submerged rigid and flexible *** comparison showed that the proposed new model can make more accurate predictions than previous *** is envisaged that the proposed formulation can be usefully employed in eco-hydraulics predictions.

关键词： Vegetation resistance drag coefficient bulk velocity open channel flow

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引用

Chinese Journal of Aeronautics 2023年第5期36卷 18-32页

作者： Zhuming RAO Ruichao LI Peizhe ZHAO Bing WANG Dan ZHAO Qiaofeng XIE School of Aerospace Engineering Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering University of CanterburyChristchurch 8041New Zealand

In this study,flame responses to acoustic disturbances with different frequencies and amplitudes were experimentally investigated in a lean premixed swirl-stabilized combustor operating at different bulk *** total heat release rate fluctuations and spatial CH*chemiluminescence distributions were captured using a photomultiplier tube and high-speed camera,*** results indicate that the heat release rate exhibits a relatively drastic oscillation and high-order harmonics for low-frequency *** the bulk velocity and forcing frequency were doubled simultaneously,similar flame structures were observed in the CH*chemiluminescence *** the bulk velocity increases,the gain of the Flame Describing Function(FDF)extends toward the higher frequencies,and the delay time of the flame response *** similarity among FDFs at different bulk velocities was effectively captured by introducing a non-dimensional parameter,defined as the ratio of the flame response delay to the forcing time scale,to replace the dimensional forcing ***,the availability of the newly defined non-dimensional parameter was verified for flames with different swirl numbers,as this played an important role in determining the flame structures and associated unsteady heat release rate.

关键词： bulk velocity Combustion instability Flame describing function Strouhal number Swirling flame Swirl number

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