一种变角度导流装置的水动力设计

借鉴风力机扩散器原理,基于提高冲击式海浪发电装置的发电效率,设计了一种变角度导流装置。低流速情况下,由于导流罩原因,扩大了内部初始海流对叶轮的冲击力,增加海浪利用效率;在高流速条件下,通过变角度逐渐缩小进流口面积,防止内部叶轮超载工作。提取影响导流罩保护性能的因素,应用RNG湍流模型对3个主要因素进行分析,选取III级海浪流流速计算相关数值,最后通过模型试验对其性能进行验证。试验选取半径0.5 m叶轮,入口流速达到8.1 m/s时外部流体冲击叶轮的有效面积为0.058 m2,此情况下不足以启动叶轮。模型分析和验证结果均表明,加装变角度导流罩对叶轮有较明显的保护作用。

Hydrodynamic design of a kind of variable angle deflector

With the help of principle of wind turbine diffuser and based on improving generation efficiency of impulse wave device,the paper designed a kind of variable angle deflector.When flow velocity is small, the deflector expand the impact force of internal initial current on impeller and increases the utilization ratio of wave; under condition of high flow velocity,the variable angle device can gradually reduce inlet area so as to avoid internal impeller overload.The paper extracted the influence factors of dome protection and applied RNG turbulent model to analyze three main factors,and selected level III waves flow velocity to calculate related numerical.The experiment methods validated its performance by making model. The test selected radius 0.5m impeller, inlet flow rate reaches 8.1m/s for 0.058m², this case is not sufficient to start the impeller. The results indicated that the installation of variable angle dome has evident protective effects on the impeller.