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木制旋浆式水轮机制作简单,适用于水头1—6米,流量是0.2—5.0秒立米的农村小型水电站,但是水轮机的比速不大时,如果通过水轮机的流量降至设计流量的30%时,水轮机就不能运转了,而在极限的比速情况下(n=800—1,000),当流量为设计流量的45%时,水轮机的效能也降低至零。因此迫切需要改进。克服旋浆式水轮机上述缺点的办法一般是在水电站内安装很多台水轮机,以便水大时多开几台机器,水小时少开几台机器,缩小一台水轮机负荷变化的极
The wooden propeller turbine is simple to make and suitable for rural small-scale hydropower stations with a water head of 1-6 meters and a flow rate of 0.2-5.0 seconds. However, when the turbine speed is not high, if the flow rate through the turbine drops to 30% of the designed flow rate, , The turbine can not operate, and at the limiting speed (n = 800-1,000), the efficiency of the turbine is reduced to zero when the flow rate is 45% of the designed flow rate. There is an urgent need for improvement. Overcoming the above shortcomings of the propeller-type turbine is generally installed in the hydropower station many turbines in order to open a few more machines when the water is large, water less hours to open a few machines to reduce the load of a turbine pole