Seite - 1566 - in Book of Full Papers - Symposium Hydro Engineering

Fig. 1 Experimental set-up Nine STED models (made of Plexiglas) with various bucket angels (α= 0°; 5°; 10°) and contraction ratios (b /B = 0.20; 0.25; 0.30) were studied. The length of the STED contraction sections was 0.5m. Table 1 summarized the geometric characteristics of the models. The models were systematically tested for approach flow Fr at the entrance of contraction section ranging from 4.10 to 5.95. Table 1 Geometric parameters of the STED models Cases α (°) b/B θ (°) M1 0.00 0.20 9.35 M2 0.00 0.25 10.00 M3 0.00 0.30 10.65 M4 5.00 0.20 9.35 M5 5.00 0.25 10.00 M6 5.00 0.30 10.65 M7 10.00 0.20 9.35 M8 10.00 0.25 10.00 M9 10.00 0.30 10.65 The form of the shock wave, the shape and the trajectory of the water wing were observed with high-speed photography. The measuring device for the measurement of the water wing was set in the downstream pool. A rectangular collector was in-house designed to measure the rain strength distribution in the downstream pool and the rainfall caused by the transversely spreading of water wing was analyzed. 1566