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在水工设计中常将导流隧洞改建成为泄洪隧洞,由于导流隧洞的高程较低,需在导流洞的上方另设进口,布置成“龙抬头”形式。在高水头、高流速条件下,溢流而往往会由于溢流表面上残存的几毫米的突体,而引起混凝土表面的空蚀破坏。为此,除在施工中严格控制不平整度外,在设计方而要精确计算出该溢流面反弧曲线以及与其上、下游直线连接点坐标值。本文介绍这种连接点的数解法。(一)“龙抬头”曲线及下游直线见图1。各点坐标为 A(x.,y.)、B(x_b,y_b)、C(x_c,y_c)、O′(a,b)。
In the hydraulic design, the diversion tunnel is often converted into a flood discharge tunnel. Due to the low elevation of the diversion tunnel, an additional inlet above the diversion tunnel is required to be arranged in the form of “dragon-headed crane”. Under high head and high velocity conditions, overflow often results in cavitation erosion on the concrete surface due to the few millimeters of protrusions remaining on the overflow surface. To this end, in addition to strict control of uneven construction in the design side and to accurately calculate the overflow surface anti-arc curve and the upper and lower straight line connection point coordinates. This article describes the number of connection points of this solution. (A) “Dragon Head” curve and the downstream line shown in Figure 1. The coordinates of each point are A (x., Y.), B (x_b, y_b), C (x_c, y_c), O ’(a, b).