Local scour due to water jet from a nozzle with plates

• Autorzy: Kartal, Veysi , Emiroglu, M. Emin
• Języki publikacji: EN

Abstrakty

EN

In this study, local scour occurring downstream from a nozzle with and without plates formed in cohesionless materials was investigated experimentally. The experiments were performed to determine scour geometry, maximum scour depth, and the efect of aeration on scour for water jets impinged obliquely into the downstream pool. Dimensionless variables afecting the scour were determined as densimetric Froude number, dimensionless impingement length, and the ratio of densimetric Froude number to dimensionless impingement length. Experiments were conducted for three nozzle diameters with plates, three nozzle diameters without plates, two diferent impingement lengths, and three diferent exit velocities. The results of the experiments showed that the use of the plates in the nozzle, jet impact velocity, jet shape, jet expansion, jet impingement length, and air entrainment rate were critical parameters for scour geometry. As a result, it was found that the jets from a nozzle with plates entrained more air bubbles into the impingement pool than jets from nozzles without plates, thereby decreasing maximum scour depth by spreading the scour over a larger area. This was evident by increasing the impingement length. In addition, scour equations were obtained to determine maximum scour depth, ridge height, and scour hole length from experimental data.

Słowa kluczowe

PL

strumień wody; rozmycie; dysza; płyty; napowietrzanie

EN

water jet; scour; nozzle; plates; aeration; downstream pool; bed sediment layer

• Czasopismo: Acta Geophysica
• Rocznik: 2021
• Tom: Vol. 69, no. 1
• Strony: 95--112
• Opis fizyczny: Bibliogr. 35 poz.

Twórcy

autor

Kartal, Veysi

• Department of Civil Engineering, Firat University, 23119 Elazig, Turkey,

autor

Emiroglu, M. Emin

• Department of Civil Engineering, Firat University, 23119 Elazig, Turkey

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Identyfikatory

DOI

10.1007/s11600-020-00521-1