Author(s): Ayata G.

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Keywords: Morning glory spillway; Physical modeling; CFD; Flow aeration; Crest profile

Abstract: Kale Dam, located in Diyarbakir, Turkey, has a morning glory spillway which might have different flow conditions according to dimensions of crest profile. The 1:20.83 scaled physical model of spillway was constructed in laboratory space in order to evaluate hydraulic performance of morning glory spillway. The spillway crest is 9.6 m (2RS), narrowed to 5 m and crest length (P) is 10.25 m in the original project. The problem within the spillway is that shaft couldn't be aerated and reservoir elevation fluctuated considerably. This problem was observed during physical experiments and also numerical analysis conducted with computational flow dynamic (CFD) software (Flow-3D). In order to evaluate possible solutions, crest mouth diameter was increased to 11 m and 4 piers were placed to shaft mouth to remove flow disturbances and vortex structures. The new transition requires at least 11 m crest length in order to get P/RS≥2 (crest length/radius), however, it was not possible to change the crest length. Therefore, P/RS was calculated 1.86 and still the coefficients for P/RS≥2 were used. Both physical and numerical experiments showed that the new transition provided aerated shaft and fluctuations were prevented.

DOI: https://doi.org/10.3850/978-981-11-2731-1_147-cd

Year: 2018