摘要
本文通过二维激光测速试验,研究了有压管道双孔板段水流的紊动特性,给出了水流的有关紊动特征参数及孔板消能系数的计算公式。研究表明,第Ⅰ级孔板与第Ⅱ级孔板相比,孔板后水流流场及能耗特性均有显著差异。在本试验条件下,第Ⅰ级孔板的名义消能系数大于第Ⅱ级孔板,但其真实消能系数却小于后者。
Based upon the turbulent velocity measurement carried out by using an improved on-axis 2-D LDV system, the turbulent characteristics of flow through the orifices in pressure conduits have been studied. Some turbulence parameters and the formulas for computing the orifice coefficient of energy dissipation are given. The results show that the flow field downstream of the first orifice and its behaviour oi energy dissipation are quite different from those of the second one. Under the condition of this experiment, the nominal coefficient of energy dissipation of the first orifice is higher than that of the second one. While its true coefficient of energy dissipation is lower than that of the latter.
出处
《水利学报》
EI
CSCD
北大核心
1989年第10期19-26,共8页
Journal of Hydraulic Engineering
