Author(s): Roger Bremen; Willi H. Hager

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Abstract: Hydraulic jumps in an abruptly expanding, rectangular and horizontal channel are considered. Particular attention is focused on so-called T-jumps, of which the toe is located upstream from the expansion section. A literature review reveals that T-jumps have not been systematically analysed until now, although considerable effort was made in understanding the phenomenon. Experiments were conducted in two channels. One channel served mainly to obtain results for the present study, while the second was three times larger and was used to check the results for scale effects. The present study aimed at analysing the effects of expansion ratio, inflow Froude number and toe position on the sequent depths ratio, the energy dissipation, the flow depth in the expansion corners, the length of jump and the lengths of the side vortices. The asymmetry ofjump was also investigated and it was found that all results may basically be expressed by a new parameter ψ according to equation (6). The present study clearly indicates that an efficient T-jump does not satisfy the requirements regarding compactness and symmetry of jump. T-jumps without additional baffle and terminal elements are thus unacceptable for thorough energy dissipation.

DOI: https://doi.org/10.1080/00221689309498860

Year: 1993