In Chapter 3, based upon the blade second-order lifting-line model and rotor free-wake model, an analytical method is developed for predicting the rotor wake structure and BVI airload.

基桨叶二阶升力线理论和旋翼自由尾迹模型，本文在第三章建立了一个直升机旋翼尾迹结构桨-涡干扰气动特性分法和模型。