Abstract This study focusses on the fluid mechanic analysis and performance assessment of a one-phase swirling flow multi-nozzle annular jet pump using Reynolds-averaged Navier–Stokes simulations and experimental measurements carried out with a bespoke test rig. The numerical investigation of the flow physics of the device, key to understanding its fluid dynamics and optimising its performance, is made particularly challenging by the existence of flow swirl. Thus, the predictive capabilities of two alternative approaches for the turbulence closure of the Reynolds-averaged Navier–Stokes equations, namely the k - ω shear stress transport and the Reynolds stress models, are assessed against measured static pressure fields for three regimes characterised by different swirl strength, and a thorough cross-comparative analysis of the flow physics using the two closures is performed to complement the information provided by the experimental measurements. At the lowest swirl level, the two simulation types are in very good agreement, and they both agree very well with the measured static pressure fields. As the flow swirl increases, the two numerical results differ more and the Reynolds stress model is in better agreement with the measured static pressure. At the highest swirl level the shear stress transport analysis predicts weaker dissipation of the jet energy and stronger mixing of injected and pumped streams, resulting in higher performance predictions than obtained with the Reynolds stress model. A CFD-based sensitivity analysis also highlights the impact of nozzle diameter and flow swirl on the pump performance, proving new guidelines for the design optimisation of this pump.

中文翻译：

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用于多喷嘴环形射流泵旋流的 RANS CFD 分析的湍流建模

摘要 本研究的重点是使用雷诺平均 Navier-Stokes 模拟和通过定制测试台进行的实验测量，对单相旋流多喷嘴环形射流泵进行流体力学分析和性能评估。设备流动物理的数值研究是了解其流体动力学和优化其性能的关键，但由于流动涡流的存在而变得特别具有挑战性。因此，针对雷诺平均 Navier-Stokes 方程的湍流闭合的两种替代方法的预测能力，即 k - ω 剪切应力传输和雷诺应力模型，针对三个以不同为特征的状态的测量静态压力场进行评估。旋流强度，并使用两个闭合对流动物理进行了彻底的交叉比较分析，以补充实验测量提供的信息。在最低涡流水平，两种模拟类型非常吻合，并且它们都与测量的静压场非常吻合。随着流动涡流的增加，两个数值结果的差异更大，雷诺应力模型与实测静压的一致性更好。在最高涡流水平，剪切应力传输分析预测射流能量消散较弱，注入和泵送流的混合更强，导致比雷诺应力模型获得的性能预测更高。基于 CFD 的灵敏度分析还突出了喷嘴直径和流动涡流对泵性能的影响，