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首页> 外文会议>Congress of Asia and Pacific Division of International Association of Hydraulic Engineering and Research >AN IMPROVED INTEGRAL MODEL FOR A ROUND TURBULENT BUOYANT JET BASED ON THE TURBULENT MEASUREMENTS
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AN IMPROVED INTEGRAL MODEL FOR A ROUND TURBULENT BUOYANT JET BASED ON THE TURBULENT MEASUREMENTS

机译：基于湍流测量的圆形湍流浮标的改进积分模型

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The development of an improved integral model for a round turbulent buoyant jet discharged into a stagnant fluid is reported here, based on the published laboratory measurements of the turbulent quantities in recent years. In order to include turbulent terms into the integral model, instead of using the control volume method, the differential method that necessitates tedious mathematical procedures is used to derive the equations. The approach is as follows: The three-dimensional governing equations of fluid mechanics are firstly transformed to the partial differential forms in a natural coordinate system; Secondly, the solution variables in the instantaneous equations are decomposed into the mean and fluctuating components, and the Reynolds averaging operations are then performed; Finally, the Reynolds-averaged governing equations are integrated over the jet cross-section, based on the axisymmetrical assumption and the best-fit curves obtained from the experimental data. Since the fluxes of a passive tracer or momentum due to the turbulent transport were measured to be about 8～15% of the advective mean fluxes, incorporating the turbulent quantities into the integral model should improve the accuracy of the prediction.
机译：在此，基于近年来湍流量的公布实验室测量，在此报告圆形湍流浮力射流的改进整体模型的开发。为了将湍流术语纳入积分模型，而不是使用控制体积方法，所以使用繁琐的数学过程的差分方法来得出方程。该方法如下：将流体力学的三维控制方程首先转化为自然坐标系中的部分差异形式;其次，瞬时方程中的溶液变量被分解成平均和波动部件，然后执行雷诺平均操作;最后，基于轴对称假设和从实验数据获得的最佳拟合曲线，雷诺平均控制方程在喷射横截面上集成在喷射横截面上。由于被动示踪剂或由于湍流传输引起的动量的势量为约8〜15％的平均助熔剂，因此将湍流量与积分模型结合到积分模型中应该提高预测的准确性。

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