摘要
本文提出了一种基于全流道的灯泡贯流式水轮机高精度性能预测方法。通过求解稳态和非稳态的雷诺时均N-s方程、大涡模拟方程和分离涡模拟方程进行性能预测。并通过与速度因数NQEO．8的贯流水轮机模型试验结果中的效率特性、压力脉动特性和转轮进口及出口的速度分布比较，评估了预测的准确性。对于协联工况附近的效率，利用稳态RANS分析可以高精度地求解。但是，对于非协联工况下压力脉动特性和水轮机特性的分析精度，还需要进一步研究。本文介绍了转轮流量和性能的评估方法，以便于今后灯泡贯流式水轮机的设计和研究工作。
In this paper, high accuracy performance prediction method based on entire flow passage for a Bulb turbine is presented. The performance is predicted by solving steady and unsteady Reynolds-Averaged Navier-Stokes equations, Large Eddy simulation and Detached Eddy Simulation. The prediction accuracy was evaluated to compare with the model test results for efficiency characteristic, pressure fluctuation characteristic and velocity distribution at runner inlet and outlet of NQE 0.8 Bulb model turbine. As for the efficiency near the on-cam condition, it is possible to determine with high accuracy in the steady RANS analysis. However, for the analysis accuracy regarding pressure fluctuation characteristic and turbine characteristics at off-cam operating condition, it found that there is a need to further study. Evaluated prediction method for the turbine flow and performance is introduced to facilitate the future design and research works on Bulb type turbine.
