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(一)绪言由挑流式溢洪道挑射出去的水流,具有相当的速度,应作为射流来考虑。到目前为止,在计算堰坝溢洪道挑射水流的水平距离方面,一直是认为不妨假设水流形成抛物线轨迹而不考虑空气阻力的影响。作者以前曾对消防喷嘴的射流的水平射距进行过考察,其结果证明,当射流速度超过某一界限(约8.5米/秒)时,其水平射距将受空气阻力及其他因素的影响,而较按照抛物线轨迹
(A) INTRODUCTION Water streams that are jetted out by a pick-up spillway have a considerable velocity and should be considered as jets. So far, in the calculation of the horizontal distance to the spillway jet spillway waterways, it has been assumed that it may be assumed that the water flow forms a parabolic trajectory irrespective of the air resistance. The authors have previously examined horizontal jets of fire jets and the results show that when the jet velocity exceeds a certain limit (about 8.5 m / s), its horizontal jerk will be affected by air resistance and other factors, And follow the parabolic trajectory