EXPERIMENTAL STUDY OF AIR ENTRAINMENT TO ALLEVIATE CAVITATIONS FOR CHUTE WITH HIGH-SPEED DISCHARGE
By 1∶40 integral hydraulic model tests,the law of air entrainment to alleviate cavitation for a base aerator and a lateral aerator of a chute is studied.The results show that the length of bottom cavity is parabolic with the discharge per unit width,and the critical discharge depends on the emergence angle.The ventilation volume of a vent is quadratic with the discharge per unit width;the aeration rate coefficient is not a constant,decreasing with the increase of flow turbulence.The air concentration increases significantly with the lateral aerator,protecting the sidewall of the chute,and the soleplate as well.