【摘要】 为进一步研究弧底梯形短喉道量水槽的水力性能及测流精度,基于RNG k-ε三维湍流模型和VOF(volume of fluid)方法,利用Fluent6.3大型流体计算软件,对不同喉道长度的短喉道量水槽进行了三维流场数值模拟。分析了该量水槽在不同喉道长度及流量下的水面线变化情况,进一步研究了弗劳德数、水头损失等水力性能,并针对同一渠道不同喉道长度的弧底梯形短喉道量水槽建立了平均误差小于5%的统一流量公式,精度较高,简单可用,该研究为后续量水槽测流公式的推导及弧底梯形短喉道量水槽在灌区的进一步应用提供参考。更多还原

【Abstract】 To further study the hydraulic properties and improve the measurement precision of arc-based trapezoidal short-throat,based on RNG k-ε three-dimensional turbulence model and the VOF( volume of fluid) method in this study,Fluent6. 3 software are employed to simulate the three-dimension flow field in arc-based trapezoidal short-throat flume with different length of the throat. The variety of the water surface under different throat lengths and flows are analyzed. The hydraulic properties such as Froude number and head loss have been obtained. The unified flow equations have been established based on different lengths of throats of the same channel show that the average error value formula for measuring flow within 5%,it has highly precise and simple to use. This study provides a reference for the further derivation of measuring flume flow measurement formula and the application of arc-based trapezoidal short-throat flow measurement flume in the irrigation area.更多还原