Model test of flow improvement effect of the permeable oblique sill on the bend in spillway chute
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Abstract:
In or der t o ex plor e t he flow improv ement effect of permeable o blique sill o n the spillw ay chute bend, w e carried o ut a model test of fiv e permeable o blique sills ( laid at an ang le o f 45b) w ith a permeable rate of 271 9% , 371 9% and 491 5% . Based o n the test r esults, we calculated the water surface ev enness and the co rresponding impro vement rate, the w at er surface difference betw een concave bank and convex bank and the corresponding decrease rate, so as to analyze the effect o f different permeable rates of the sill and differ ent flow rates on impr oving the flow o f the bend. The results w ere as follow s. Firstly , t he permeable oblique sill set at the bend co uld stro ng ly impr ove the bend f low , incr ease water surface ev enness at t he bend, and decrease w ater surf ace difference. Secondly, permeable rate could affect the f low impro vement effect. Under t he same flow r ate, the smaller the permeable rate, the better the effect of the sill on flow impro vement. T hirdly , t he effect o f the sill on flow impro vement wo uld vary w ith the flow r ate; the effect w as mo re obvio us when the flow r ate w as low . Reg arding the im pr ovement effect on the w ater surf ace evenness at the bend, the different permeable rates or flow r ates did not make much difference.
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