摘要
对以往圆形喷灌机输水管出流多口系数的计算公式进行了分析。圆形喷灌机输水管上除了第一个出水口与中心支轴中心线的距离外 ,其余出水口之间的距离均相等 ,在此条件下 ,提出了圆形喷灌机末端出流不为零时输水管多口系数的计算公式。该公式计算精度高 ,适用范围广。
The present equations for friction factor of center pivot system were discussed in this paper. Under the conditions that the lateral has equally spaced multiple outlets and the first outlet is not a full outlet spacing from the pipeline inlet, a new analytical equation for the friction factor of a center pivot system with end flow is developed. When the end flow is zero and the first outlet is one outlet spacing from the pipeline inlet, the friction factor from the developed equation reduces to a close approximation of other well known factors. The results from the equation has a high accuracy and are in good agreement to those computed by the previous equations.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2003年第5期65-68,共4页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家"863"计划项目 (项目编号 :2 0 0 1 AA2 42 0 2 3)
