The tradeoff for this effectiveness is a higher loss coefficient, as shown in Table 7-2.1, in which the loss coefficient is the unrecoverable portion of the upstream dynamic pressure of the flow.

• 这种高效所换来的是一个很高的损失系数，如表7-2.；1所示，在其中损失系数是水流中不可弥补的上升流动态压力。