基于出坎挑角和出坎流速影响的挑距试验研究  

Experimental Study on Ski Jump Jet Trajectories Based on the Takeoff Angles and Velocities

作　　者：张晓艳[1] ZHANG Xiaoyan(School of Electric Power,Civil Engineering and Architecture,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学电力与建筑学院,山西太原030006

出　　处：《山西大学学报（自然科学版）》2022年第6期1523-1529,共7页Journal of Shanxi University(Natural Science Edition)

基　　金：河北省自然科学基金(E2019402102)。

摘　　要：采用物理模型试验方法,针对圆弧形挑坎,详细测量其挑流水舌挑距和出坎挑角,目的是研究出坎挑角和出坎流速对挑距的影响。基于试验实测数据,采用抛物体运动轨迹方程反算出坎流速,研究出坎流速和出坎挑角随鼻坎体型参数和流动参数的变化规律,进一步拟合流速和挑角的计算方法;基于出坎流速和挑角计算式,推出上缘和下缘挑距计算方法。相比实测挑距,计算挑距的最大误差分别为上缘11.11%,下缘6.97%。To study the effects of the takeoff angles and velocities on the jet trajectories in circular-shaped buckets,the takeoff angles and the horizontal lengths of jet flow are measured using the laboratory model experiment.According to the experimental results,the takeoff velocities were calculated from the projectile equation of motion,the change pattern of the takeoff angles and the takeoff velocities with hydrualic and structure parameters were analyzed,and the regression cure were fitted furtherly.Based on the computing formulas of the takeoff angles and the takeoff velocities,the computing method for the throw distances of upper and lower jet trajectories was given.Compared with throw distance measured from experiment,the maximum relative errors of both xUcaland xLcalare11.11%and 6.97%,respectively.

关 键 词：圆弧挑坎 出坎挑角 出坎流速 挑距 

分 类 号：TV653[水利工程—水利水电工程]