为探索和研究短距起飞/垂直降落(STOVL)飞机，在垂直降落状态时的外流场特性和热燃气再吸入等飞推一体化关键问题，对STOVL飞机F-35B进行了飞机机身重构和网格划分，利用Fluent软件完成了F-35B外流场的三维数值模拟。研究了垂直降落状态下飞机不同离地高度和不同喷管面积下的热燃气再吸入问题。同时，给出了进气道入口截面、地面和机身的温度分布，直观说明了其升力系统方案的外流场技术特点。结果表明：为防止热燃气再吸入，应合理选择升力风扇喷口与主发动机喷口的面积相对值，并结合实际所需升力比，尽量减小两个喷口的面积比。%To explore and research the external flow field performance and airframe/propulsion integration key problems such as resorption of hot gas etc. in short take off/vertical landing (STOVL) aircraft on verti-cal landing mode, the airframe reconstruction and mesh generation of F-35B which is the most advanced STOVL aircraft at present was conducted. By the 3-D numerical simulation of the F-35B's flow field in Flu-ent, the resorption of hot gas on different flying height and nozzle's area on vertical landing mode was investi-gated. And the temperature distribution in the entrance section of the engine intake, ground and airframe was given, directly illustrating the external flow field characteristic of the lift system project. The results show that the relative value of the two nozzles' area should been chosen reasonably to avoid the resorption of hot gas, decreasing the area ratio of the lifting fan's nozzle and the main engine's nozzle as far as possible ac-cording to the actual lift ratio.
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