Heat-dissipation optimization of recirculation zone in brake disc passage based on NSGA-Ⅱ algorithm
In this article,in order to improve the convective heat-dissipation performance in the recirculation zone of the ventilated brake disc passage,efforts are made to focus on the internal straight vanes of the ventilated brake disc and carry out structural optimization based on the genetic algorithm.Firstly,the optimal Latin sampling method is used to sample the data,fit the response-surface model and verify whether the proxy model is accurate.Secondly,based on the model of the straight vanes,three structural parameters are selected as the optimization variables:the width of the slot,the inclination angle of the slot,and the number of the vanes,and the maximum mass flow rate and the maximum convective heat-transfer coefficient are used as the objectives,so as to optimize the internal design of the brake disc and work out the Pareto optimal solution.Finally,the fluid flow and the heat-dissipation effects in the two brake disc passages are compared before and after optimization.The results show that the optimized slotted vanes effectively weaken the recirculation zone in the passages,thus resulting in more uniform airflow distri-bution.Compared with the straight vane disc,the slotted vane disc has 12%higher pumped mass flow capacity,5.6%higher in-ternal heat-dissipation rate and 9%higher overall heat dissipation.