The chute aerators separate the flow from the chute bottom,and the violent turbulence is generated after the flow impacts the bottom.Although the chute aerators were widely investigated experimentally,the air concentr...The chute aerators separate the flow from the chute bottom,and the violent turbulence is generated after the flow impacts the bottom.Although the chute aerators were widely investigated experimentally,the air concentration distribution of the lower jet in the impact zone remains to be explored systematically.In the impact zone,it is observed that a portion of the air stays in the rollers instead of traveling with the flow,decreasing the air transportation capacity.Based on extensive tests,a comprehensive formula is developed to compute the air concentration distribution in the impact zone,with results in good agreement with the model tests.展开更多
The chute aerators separate the flow from the chute bottom,and the air can enter into the flow through the lower surface.In this study,the air concentration and the pressure along the chute bottom are investigated sys...The chute aerators separate the flow from the chute bottom,and the air can enter into the flow through the lower surface.In this study,the air concentration and the pressure along the chute bottom are investigated systematically by a series of model tests with the upper aeration effect being eliminated.The chute downstream the aerator is partitioned into four zones:the cavity zone,the impact zone,the equilibrium zone,and the far zone.It is found that a large amount of air entrained in the cavity zone is only partially entrained into the flow finally.Furthermore,the lower air discharge is decreased sharply in the impact zone,and the detrainment disappearsonthe section of x= Lm.In the equilibrium zone,the lower air discharge is kept unchanged.With the in crease of the flow Froude number and withthe other parameters kept unchanged,it is found that the dimensionless value of K has a significant increase.Meanwhile,a formula to calculate K is proposed,with results in good agreement with the model and prototype data.展开更多
基金supported by the National Key Research and Development Program opf China(Grant No.2016YFC0401707).
文摘The chute aerators separate the flow from the chute bottom,and the violent turbulence is generated after the flow impacts the bottom.Although the chute aerators were widely investigated experimentally,the air concentration distribution of the lower jet in the impact zone remains to be explored systematically.In the impact zone,it is observed that a portion of the air stays in the rollers instead of traveling with the flow,decreasing the air transportation capacity.Based on extensive tests,a comprehensive formula is developed to compute the air concentration distribution in the impact zone,with results in good agreement with the model tests.
基金the National Key Research and Development Program (Grant No.2016YFC0401707)the National Natural Science Foundation of China (Grant Nos.51709293,51479129).
文摘The chute aerators separate the flow from the chute bottom,and the air can enter into the flow through the lower surface.In this study,the air concentration and the pressure along the chute bottom are investigated systematically by a series of model tests with the upper aeration effect being eliminated.The chute downstream the aerator is partitioned into four zones:the cavity zone,the impact zone,the equilibrium zone,and the far zone.It is found that a large amount of air entrained in the cavity zone is only partially entrained into the flow finally.Furthermore,the lower air discharge is decreased sharply in the impact zone,and the detrainment disappearsonthe section of x= Lm.In the equilibrium zone,the lower air discharge is kept unchanged.With the in crease of the flow Froude number and withthe other parameters kept unchanged,it is found that the dimensionless value of K has a significant increase.Meanwhile,a formula to calculate K is proposed,with results in good agreement with the model and prototype data.
