消能锥形阀能量耗散特性与复合式结构优化OA

To investigate the energy dissipation characteristics of the cone valve and improve its energy dissipation effect,a research method combining CFD numerical simulation,response surface analysis,and the NSGA-Ⅱ algorithm was adopted.The energy dissipation mechanism of the cone valve was ex-plored and the coupling influence characteristics of the structural parameters were analyzed.With the sleeve hole diameter,spool angle,and orifice diameter as the core factors,response surface analysis was carried out using the flow-field entropy production as the objective.Samples were extracted by the Latin hypercube method.The data were fitted via the LM algorithm of a neural network,and the NSGA-Ⅱ algorithm was employed to predict the structural parameter combination that gived the highest entropy production,thereby achieving the optimization of the cone valve's energy dissipation effect.The results show that the spool angle and the orifice diameter have a significant influence on the entropy production value of energy dissipation,while the sleeve hole diameter has a relatively small effect.However,there is a clear coupling influence characteristic between the sleeve hole diameter and the orifice diameter.The optimized structural parameters are a sleeve hole diameter of 109 mm,a spool angle of 42°,and an orifice diameter of 4 mm.The model achieves a substantial increase in entropy production rate under different water heads,with an improvement rate of 21.5%under the high-head condition and a 12%increase in the energy dissipation coefficient.After optimization,the entropy pro-duction rate at the spool tail increases significantly,and the energy dissipation caused by high-speed disturbances and vortices in the tail region of the spool is markedly enhanced,which is an important reason for the performance improvement of the modified energy-dissipation cone valve.