目前,引水式电站实测水轮机效率最常用的方法是流速仪法,由于流速仪测点在支臂沿半径方向的布置是不等距的,因此测点之间流速系依靠作图求取,同时,由于流量积分公式中有两个变量V(流速)及r(测点与钢管中心的距离),不能积分,故通常先转化为以纵坐标为V·r及横坐标为r,绘制V·r—r图,再求积分。这样,不但工作量大,易出错,且精度低。 At present, the most commonly used method for measuring the turbine efficiency of a water diversion power station is the current meter method. Since the measuring points of the flow meter are not equidistant along the radial direction of the support arm, the flow rate between the measuring points depends on the drawing, , Since there are two variables V (flow rate) and r (distance between measuring point and pipe center) in the integral formula of flow, it can not be integrated. Therefore, it is usually converted to V · r on the ordinate and r on the abscissa r-r map, and then seeking points. In this way, not only heavy workload, error-prone, and low accuracy.