Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Hydraulic characteristics of countercurrent jets on adverse-sloped beds
The counter-current jet (CCJ) acts like a reverse surface jet layer covering the free jump surface and has potential applications in the energy dissipation of hydraulic engineering. The present study investigated the hydraulic characteristics of CCJs on adverse-sloped beds. The results showed that, compared to the horizontal bed, the slope didn't increase the energy dissipation rate of CCJ but reduced the return flow length and upstream depth. The velocity distribution along the depth was divided into the boundary layer region, mixing region, and reverse surface jet region. The velocity distribution in the boundary layer region and the mixing region was similar to the classical wall jet. The jet Froude number and the bed slope had no significant effect on the turbulence intensity distribution and turbulence kinetic energy (TKE) distribution of CCJ. The distribution of TKE was similar to that of a submerged jump. The maximum absolute turbulence intensity appeared at exactly half of the maximum velocity. The maximum TKE appeared at the mixing region. Besides, empirical formulas for estimating length scales and maximum velocity attenuation are proposed. The results could provide a reference for the potential application of CCJ in energy dissipation in hydraulic engineering. HIGHLIGHTS The hydraulic characteristics of counter-current jets (CCJ) on adverse-sloped beds were investigated for the first time.; The velocity distribution of CCJ was divided into three regions along the depth.; The turbulence intensity and turbulence kinetic energy distribution of CCJ had self-similarity.; A new counter-current energy dissipator with potential applications was provided.;
Hydraulic characteristics of countercurrent jets on adverse-sloped beds
The counter-current jet (CCJ) acts like a reverse surface jet layer covering the free jump surface and has potential applications in the energy dissipation of hydraulic engineering. The present study investigated the hydraulic characteristics of CCJs on adverse-sloped beds. The results showed that, compared to the horizontal bed, the slope didn't increase the energy dissipation rate of CCJ but reduced the return flow length and upstream depth. The velocity distribution along the depth was divided into the boundary layer region, mixing region, and reverse surface jet region. The velocity distribution in the boundary layer region and the mixing region was similar to the classical wall jet. The jet Froude number and the bed slope had no significant effect on the turbulence intensity distribution and turbulence kinetic energy (TKE) distribution of CCJ. The distribution of TKE was similar to that of a submerged jump. The maximum absolute turbulence intensity appeared at exactly half of the maximum velocity. The maximum TKE appeared at the mixing region. Besides, empirical formulas for estimating length scales and maximum velocity attenuation are proposed. The results could provide a reference for the potential application of CCJ in energy dissipation in hydraulic engineering. HIGHLIGHTS The hydraulic characteristics of counter-current jets (CCJ) on adverse-sloped beds were investigated for the first time.; The velocity distribution of CCJ was divided into three regions along the depth.; The turbulence intensity and turbulence kinetic energy distribution of CCJ had self-similarity.; A new counter-current energy dissipator with potential applications was provided.;
Hydraulic characteristics of countercurrent jets on adverse-sloped beds
Lei Wang (Autor:in) / Zhen Li (Autor:in) / Ming-jun Diao (Autor:in)
2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
Metadata by DOAJ is licensed under CC BY-SA 1.0
Jet impingement and the circular hydraulic jump on adverse-sloped beds
| Taylor & Francis Verlag | 2024
Hydraulic jumps on rough and smooth beds: aggregate approach for horizontal and adverse-sloped beds
| Taylor & Francis Verlag | 2015
Hydraulic jumps on rough and smooth beds: aggregate approach for horizontal and adverse-sloped beds
| Online Contents | 2015
Approach to morphological equilibrium for steep-sloped river beds
| British Library Conference Proceedings | 1999