TY - JOUR ID - 12677 TI - Effect of Vortex Breaker Blades 45 Degree on Discharge Coefficient of Morning Glory Spillway Using Flow-3D JO - Irrigation Sciences and Engineering JA - JISE LA - en SN - 2588-5952 AU - Nouroozi, Sahar AU - ahadiyan, javad AD - Y1 - 2017 PY - 2017 VL - 40 IS - 1 SP - 191 EP - 200 KW - Morning glory spillway KW - Discharge Coefficient KW - Vortex breaker KW - Numerical model of FLOW-3D DO - 10.22055/jise.2017.12677 N2 -      The discharge coefficient of morning glory spillway is decreased with eddies created by vortex at the inlet part of weir. However, a series of specific blades can reduce vortices which result in the spillway efficiency is increased. Hence, in this research numerical modeling of installed breaker blade on morning glory spillway was evaluated using Flow-3D model. To achieve these purposes, morning glory spillway was modeled without and with blades 3, 4 and 6 blades at 45 degree angle. To simulate the turbulence fluctuations, the modified k-e model (RNG k-e) was used and its results were compared to the experimental data. Results showed that by installing blades, the discharge coefficient increases up to 42 percent with 25 percent decreasing in the upstream water level. Moreover, among the three different arrangements of blades, the six-blade model was found to have more satisfactory results than other models. In comparison to control model, for H/D between 0 to 0.1 and 0.1 to 0.2 the discharge coefficient has been increased 40 and 57 percent for six-blade arrangement, respectively.  UR - https://jise.scu.ac.ir/article_12677.html L1 - https://jise.scu.ac.ir/article_12677_fa49ed2d64e517b224f8972e2ade2c3e.pdf ER -