论文部分内容阅读
本文对槛尾部充分通气的水流分析了连续式矩形槛的初始水跃状态。此流态对应于极限槛高、水面曲线仍保持连续和水流完全是急流。对于一定的行近条件,稍稍增加槛高,就会导致水面局部不连续,例如,初始水跃轮廊由槛来控制。槛的阻力系数可用雷史(Rethy)的无重力解法来确定。假设在水舌上升最高时为临界流,那么,对于重力流应用纵向动量定理,由行近佛汝德(Froude)数可以预测极限相对槛高,其结果与两条矩形渠道中观测的结果进行比较,其中第一条渠道的槛后有跌水,而第二条渠道中的槛被安装在水平底上。可发现两个轮廊的主要趋势相同,且与预测值颇为吻合。
In this paper, the initial water jump of continuous rectangular sills is analyzed for the fully aerated flow at the tail of the sills. This flow corresponds to a high threshold, the water surface curve remains continuous and the water flow is completely rapids. For a certain number of near conditions, a slight increase in the high threshold, it will lead to partial discontinuity of the water surface, for example, the initial hydro-hydrofoil by the threshold to control. The resistance coefficient of the threshold can be determined using the gravity-free solution of Rethy. Assuming a critical flow at the highest rise of the water tongue, then using the longitudinal momentum theorem for gravity flow, the threshold relative threshold can be predicted by the number of near-line Froude numbers. The result is consistent with observations made in two rectangular channels In comparison, the threshold of the first channel fell after the threshold, while the threshold of the second channel was installed on the horizontal bottom. The main trend of the two rotors can be found to be the same and quite in line with the forecast.