Performance Analysis and Optimization Design of an Oscillating Jet Actuator Based on the Surrogate Model

In order to improve the performance of the oscillating jet actuator, the optimization design of the actuator is carried out using numerical simulation. The aim of optimization is to improve the uniformity and range of jet sweeping; the evaluation indices of the actuator are proposed; the kriging surrogate models are established to describe the relation between the geometric parameters and evaluation indices, and the effects of the interaction between parameters on the jet are analyzed with the flow fields; the multi-objective genetic algorithm is called to complete the optimization of the actuator. The results show the followings: the interaction between the height and the length of the mixing section have a strong effect on the jet, and both of them determine the slenderness of the mixing section together; the more slender the mixing section, the easier it is for the jet to adhere to the wall of the mixing section, which leads to uneven jet sweeping and small deflection angle of the jet; the effect of the interaction between the second throat, the expansion angle and length of the expansion section on the jet is weak, which affects the degree of deflection of the jet at the second throat, the degree of the jet adhering to the wall of the expansion section and the size of the separation vortex in the expansion section, respectively; the optimized actuator increases the jet sweeping uniformity by 2% and the jet deflection angle by 5°.