Analysis of Multifactor Influence Model on Energy Dissipation Rate of Rough-Strips Energy Dissipator in the Spillway Bend

Abstract

e rough-strips energy dissipator (R-SED) is applied to the bottom of the spillway bend and can play the role of energy dissipation and ow stabilization. In this study, based on 18 sets of orthogonal tests and the principle of dimensional analysis, a multifactor in uence model of R-SED's energy dissipation rate was proposed. A dimensionless factor k was introduced, which can re ect the comprehensive characteristics of the geometric dimensions of R-SEDs. e multifactor in uence model of the energy dissipation rate considered nine factors, including bend radius of curvature R c , bend width B, ow velocity of the bend inlet v, R-SED's average height h L , R-SED's arrangement angle θ, R-SED's arrangement spacing ∆L, uid density ρ, dynamic viscosity coe cient μ, and gravitational acceleration g. e residual sum of squares of the model (RSS) was 6.6% and the correlation coe cient R was 83.2% (>80%), indicating the universality and feasibility of the model.e independent variables of the multifactor model of the energy dissipation rate were ranked according to the Pearson value in descending order:. is indicates that R-SEDs' layout parameters showed larger e ects on the multifactor model of the energy dissipation rate, compared with the engineering layout parameters of the spillway. e maximum relative error between the predicted value of the multifactor model and the measured value of the validation group was 6.28%, indicating good agreement. In the orthogonal tests, scenario 5 had the highest energy dissipation rate (44.83%) with k = 0.023; scenario 16 had the largest k value (0.043), with an energy dissipation rate of 40.78%. e multifactor in uence model of R-SEDs' energy dissipation rate proposed in this paper was a semi-theoretical and semi-empirical calculation formula, which can provide reference and support for similar practical engineering designs.