式中:∑ξ—进口及沿程阻力系数的总和因为式(1)中的Z和θ都是未知值,因此,常采用的解题方法是:建立对应于一系列θ值的图表L′=f(z),并根据这个图表决定相应于最大挑距的Z和θ。但是,这样的计算是相当繁复的。如果计算水舌挑距的坐标原点不设在出口断面的中点,而是设在水舌表面(图1),那 Where: Σξ - the sum of the drag coefficients along the inlet and the distance Because Z and θ in Eq. (1) are unknown values, the commonly used solution is to create a plot L ’corresponding to a series of θ values = f (z), and according to this chart, decide Z and θ corresponding to the maximum distance. However, this calculation is quite complicated. If the calculation of the water tongue pick the origin of the coordinates of the distance is not located in the midpoint of the outlet section, but located in the water tongue surface (Figure 1), then