基于连续数值模拟的双击式水轮机设计与性能优化新方法
A Novel Design and Performance Optimization Methodology for Hydraulic Cross-Flow Turbines using Successive Numerical Simulations
摘要：
本文介绍了一种新的方法，用于设计和优化性能的水力双击式水轮机的广泛的操作条件。该方法是基于系统级设计阶段的一步法和详细设计阶段的三步，连续的数值分析方法。与当前的设计方法相比，这种方法不仅将过程分解为明确定义的步骤并简化了过程，而且还具有以下优点：一旦对单个涡轮机进行了数值模拟，则大多数结果可用于整个双击式水轮机类别。本文在论述了研究背景后，详细介绍了涡轮的设计过程和基于ANSYS的CFD模型。设计过程包括三个步骤。首先，设计喷嘴几何形状;其次，优化转轮参数;第三，通过分析各种负载条件来提高涡轮性能。在模拟案例研究中使用该过程设计的涡轮机实现了91%的峰值水力效率和82%的峰值总效率，该峰值总效率在体积流率低至标称值的14%和水头变化高达标称值的30%时保持不变。
英文摘要：
This paper introduces a new methodology for designing and optimizing the performance of hydraulic Cross-Flow turbines for a wide range of operating conditions. The methodology is based on a one-step approach for the system-level design phase and a three-step, successive numerical analysis approach for the detail design phase. Compared to current design methodologies, not only does this approach break down the process into well-defined steps and simplify it, but it also has the advantage that once numerical simulations are conducted for a single turbine, most of the results can be used for an entire class of Cross-Flow turbines. In this paper, after a discussion of the research background, we explain the design process used and the ANSYS-based CFD model of the turbine in detail. The design process consists of three steps. First, designing nozzle geometry; second, optimizing runner parameters; and third, enhancing turbine performance by analyzing various load conditions. A turbine designed using this process in a simulation case study achieves a peak hydraulic efficiency of 91% and peak overall efficiency of 82% that is maintained for volume flow rates as low as 14% of the nominal value and water head variations up to 30% of the nominal value.
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