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Measurement of water current field created by paddle wheel aerators in shrimp culture pond

机译：虾养殖池中桨式增氧机产生的水流场的测量

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Intensive cultures of shrimps produce more than 10 individuals per square meters with the use of hatchery reared post-larvae and the supply of compounded diets. The paddle wheel aerators are usually installed in the pond to supply oxygen and collect the sludge generated from the excretion of shrimps and the rest of the compounded food. The operation of paddlewheel aerators consume plenty of oil or electricity, therefore the strategy of installation density and arrangement of the paddle wheel aerators is quite important to save the energy and represent the best performance. The strategy is determined empirically, while several surveys were carried out to examine the performance of aeration. The purpose of the present study is to measure the water current field in the shrimp culture pond for obtaining the data to validate the numerical model. The measurement of water current field was carried out in the pond of culturing Penaeidshrimp. The water depth ranges between 0.6 m and 2.3 m depending on the area. Paddle wheel aerators with the power of 1 kW were installed at 8 points from the experience of local workers. Water current velocity was measured at the sampling rate of 16 Hz at every 14 m and 26 m in transverse and longitudinal directions, respectively (totally 44 points), and in several layers every 0.3m in the vertical direction. As a result, a general circulation was created successfully, while the current field just around the aerators was complex. Some small eddies were observed near the several aerators. The bottom stress was estimated by a simple equation and was compared with the distribution of the thickness of the sludge, which was obtained from the interview to local workers. The useful data were obtained to validate the numerical model which will potentially show the efficient operation and arrangement of paddle wheel aerators in any culture pond.
机译：通过在幼体后孵化的孵化场和复合日粮的供应，对虾的集约化养殖每平方米可生产10多个个体。桨式增氧机通常安装在池塘中，以提供氧气并收集虾排泄物和其他复合食物产生的污泥。桨式增氧机的运行会消耗大量的油或电，因此桨式增氧机的安装密度和布置策略对于节约能源和表现出最佳性能非常重要。该策略是根据经验确定的，同时进行了一些调查以检查通气性能。本研究的目的是测量虾养殖池中的水流场，以获取数据以验证数值模型。在养殖对虾的池塘中进行水流场的测量。根据区域的不同，水深在0.6 m至2.3 m之间。根据当地工人的经验，在8点安装了功率为1 kW的明轮曝气机。水流速度分别在横向和纵向（总共44个点）上每14 m和26 m处以16 Hz的采样率进行测量，而在垂直方向上每0.3 m则以几层为单位测量水流速度。结果，成功建立了一个总体循环，而曝气器周围的当前场很复杂。在几个曝气机附近观察到一些小的涡流。通过一个简单的方程式估算底部应力，并将其与污泥厚度的分布进行比较，该分布是通过对当地工人的采访获得的。获得了有用的数据以验证数值模型，该数值模型可能显示出在任何养殖池中桨轮式曝气机的有效运行和布置。

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