Comparison of water level between measured and computation shows that the local head loss coefficient cannot give head loss by spur dike completely , and the effective area of passage is difficult to be ascertain . for this reason the two methods for water surface profile computation cannot predict the raise of water level upstream the spur dike accurately 计算结果表明，局部水头损失系数并不能完全反映出由于丁坝阻挡所带来的水头损失，而丁坝附近的有效过水面积难以准确地确定，这些导致前两种方法均不能很好地计算出丁坝上游水位的壅高值。
The results indicated that the generation of trailing - vortex of downstream adjacent vanes could be restrained effectively by upstream wake when the passing frequency and the amplitude of wake defect satisfy some conditions , associated with a significant enhancement of time - averaged aerodynamic performances : loss coefficient reducing 40 . 2 % and the ratio of loading coefficient and loss coefficient increasing 93 % 研究表明：满足一定通过频率和亏损幅值条件的尾迹能够有效抑制下游相邻叶排尾缘涡的生成，达到控制或是推迟附面层非定常分离的目的，从而使得流场时均性能大幅度的提高，损失系数降低了40 . 2 % ，功损比增加93 % 。
Based on the head loss coefficients obtained from gardel ' s semi - empirical equations for t - junction flow and experiment of welded t - junction , the hydraulic characteristics of throttled surge tank are estimated and compared with those gotten from hydraulic experiment . 3 . four different methods of determining the head loss coefficients of throttled surge tank have been employed to investigate the effect of methods afore mentioned on the accuracy of calculating surge and pressure head of throttled surge tank 给出了基于gardel关于三通管水头损失系数的经验公式、焊接t形三通管水头损失系数的实验资料及截面突变管道的水头损失资料，计算有连接管的阻抗式调压室在不同流态下水头损失系数的计算方法，并将这两种方法计算得到的调压室局部水头损失系数分别与模型试验成果进行了比较和分析； 3
From this point of view , a general analytic expression for the coefficient of local energy loss was presented based on the principle of hydrodynamics , together with experiments on particular flow characteristics and energy dissipation mechanism at right - angle junctions , and the expression was validated with the experimental data 为此，根据水动力学基本原理，在分析90汇流口独特水流特性及能量耗散机理的基础上，提出了局部能量损失系数的综合表达式，并应用试验资料对该综合表达式进行了验证。
