Analysis of influence factors of cavity length in the spillway tunnel downstream of middle gate chamber outlet with sudden lateral enlargement and vertical drop aerator

Abstract

For the aerator of sudden lateral enlargement and vertical drop at the outlet of middle chamber is taken as research object by the method of turbulent numerical simulation which is used to study the cavity length of spillway tunnel downstream of chamber. And there is reasonably good agreement between the numerical simulation and model tests results. The results show that, the distribution of adhesion spots along side wall varies according to the changing of aerator geometric dimension; changes of drop height or enlargement width have effect on both lateral and bottom cavity length; the bottom cavity length correlates closely to drop height and lateral cavity length has the most remarkable effect on enlargement width; under the same shape, both the lateral and bottom cavity grows longer with Froude number increasing, and the bottom cavity grows rapidly.