چكيده به لاتين
In the output of dams, the entrance of ponds and pools often the most important requirement along with the regulation of flow is the energy depreciation issue. As water has a high density and is heavy in term, goes out of the dam from the bottom of the dam with a high energy resulting from the weight of the water. If this energy isn’t depleted, the water flow can erode rocks and soil and damage to the facilities. The objective in this thesis is to investigate stilling basins, in which by formation of hydraulic jump and the conversion of the water flow regime behind dam from supercritical to subcritical, an energy depletion occurs in the water flow. The flow passing the stilling basin in which instead of using wedge blocks, inverse T-shaped blocks have used, numerically by dimensionless making the measures, the Froude number Fe=2.85 has been analyzed by ANSYS Fluent CFD 18 software. After review of the results it was determined that results have been improved compared to the Vorma and Gul basins and USBR VI and these results were validated in view of the laboratory article on the effect of the reverse T-shaped block split in the stilling basin. Finally by study of the effect of the block distance from output pipe, it was found that the best rate of the mentioned distance is 1d to 1.2d. Despite of increase of speed near the distance 1.2d, this increase can be ignored in proportion to reduction of pressure applied to the block and the same distance can be considered as a more appropriate distance for the block.
Keywords: numerical analysis, inverse t-shaped block, stilling basins, water, energy depreciation
