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首页> 外文期刊>Journal of Energy Engineering >Effect of Paddle-Wheel Pulsating Velocity on the Hydrodynamic Performance of High-Rate Algal Ponds
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Effect of Paddle-Wheel Pulsating Velocity on the Hydrodynamic Performance of High-Rate Algal Ponds

机译:桨轮脉动速度对高速藻类池塘水动力性能的影响

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摘要

High-rate algae ponds (HRAPs) are widely used in increasing biofuel production because of their effective design in terms of cost and power consumption. Using modeling and simulation techniques is an economical approach for improving the design of raceways. Previous modeling studies reported the use of a flat velocity profile, thus failing to depict the real phenomena involved. However, in practice, the rotating paddle wheel in HRAPs produces a pulsating velocity that is necessary for culture growth. In this study, the hydrodynamic characteristics of algal ponds were investigated using a coupling algorithm to map the effects of a two-dimensional paddle wheel on a three-dimensional raceway model. HRAPs with and without paddle wheels were compared in terms of hydrodynamic mixing, dead zones, and power consumption. The results revealed that compared with a flat velocity at the inlet, the pulsating velocity of a paddle wheel produced a large dead zone volume with reduced power consumption, shear stress, and turbulence. A few pond design modifications were tested with this realistic situation and an additional recirculation zone was found near the paddle wheel. This zone needs to be addressed in future pond designs. (C) 2014 American Society of Civil Engineers.
机译:高速率藻类池塘(HRAP)由于在成本和功耗方面的有效设计而被广泛用于增加生物燃料的生产。使用建模和仿真技术是一种改进滚道设计的经济方法。先前的建模研究报告了使用平坦速度分布图,因此无法描述所涉及的真实现象。但是,实际上,HRAP中的旋转桨轮会产生培养生长所必需的脉动速度。在这项研究中,使用耦合算法对藻类池塘的水动力特性进行了研究,以绘制二维桨轮对三维跑道模型的影响。比较了有桨叶轮和无桨叶轮的HRAP的流体动力混合,死区和功耗。结果表明,与入口处的恒定速度相比,明轮的脉动速度产生了较大的死区体积,从而降低了功耗,剪切应力和湍流。在这种现实情况下,对一些池塘设计进行了修改,并在桨轮附近发现了一个额外的再循环区。在未来的池塘设计中需要解决这个区域。 (C)2014年美国土木工程师学会。

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