نشریه علمی
نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه سازههای آبی، دانشکده مهندسی آب و محیط زیست، دانشگاه شهید چمران اهواز، اهواز، ایران
2 هیئت علمی گروه سازه های آبی دانشکده مهندسی آب و محیط زیست دانشگاه شهید چمران اهواز
کلیدواژهها
عنوان مقاله English
نویسندگان English
Objective: Using a water injection system with counter and transverse jets against the flow passing over an ogee spillway after a sudden expansion reduces pressure fluctuations and turbulence along the channel, resulting in flow uniformity and consequently controlling asymmetric jumps.
Methods: In this research, the hydrodynamic flow parameters in a channel were investigated using a combination of a transverse jet at angles of 30, 45, and 90 degrees at two heights of 35 and 45 cm from the channel bed, and the simultaneous use of a counter jet with 5 fixed jets and a total discharge of 4 liters per second, with three Froude numbers of 4.7, 7.8, and 9.5.
Results: The jet injection time, the βL parameter (a parameter similar to the Boussinesq coefficient in the momentum equation) in the S jump exhibits less turbulence and dispersion compared to the T jump, indicating that the use of a transverse jet injection system can act as a flow dissipater, leading to flow uniformity. It also causes a significant reduction in the flow momentum (βL.Vm²) at the sudden expansion section from the beginning to the end of the channel.
Conclusions: The use of a transverse and counter jet system with varying angles can significantly reduce turbulence and channel erosion, control asymmetric hydraulic jumps, and uniformize the flow velocity distribution along the channel.
کلیدواژهها English
