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为了研究在1m左右的微水头的工况下,不同导流结构对灯泡贯流式水轮机内部流态及能量特性产生的影响,通过数值模拟方法,对无活动导叶的原方案进行优化,结合两种不同的支撑及两种不同宽度导叶下共六种不同方案的水轮机进行内部流场分析及性能研究.结果表明:水轮机增加导叶后,使水流在进入转轮前产生环量,但也增大了转轮前流道的水头损失;宽导叶导流后水流的切向速度及动量矩最大,但在圆周方向水流分布不均匀;窄导叶对水流的影响小于宽导叶;弯曲型支撑则将支撑和窄导叶结合起来,也结合了两者的优点,结构简单,转轮前水头损失较小,转轮进出口动量矩不是最大的,但水流对转轮的作用力矩最大,效率提高了5.8%,达82.7%,叶片表面压力变化梯度较小,空化性能良好.
In order to study the influence of different diversion structures on the flow and energy characteristics of a bulbous turbine with a micro-head of about 1m, the original scheme of the guideless vane is optimized and combined by numerical simulation Two kinds of different supports and two different widths of guide vanes, the internal flow field and the performance of the turbine were studied.The results show that after the guide vane is added in the turbine, the water flow is generated before entering the runner, But also increases the head loss of the front runner of the runner. The tangential velocity and moment of momentum of the guide vane after the guide flow of the wide guide vane are the largest, but the distribution of the water flow in the circumferential direction is uneven. The influence of the narrow guide vane on the water flow is smaller than that of the broad guide vane. The curved support combines the support with the narrow guide vane and also combines the advantages of the two. The structure is simple, the loss of the head in the runner is small, and the momentum at the wheel inlet and outlet is not the maximum, but the moment of the water flow to the runner The maximum efficiency of 5.8%, up to 82.7%, blade surface pressure gradient of small, good cavitation performance.