中文说明：本MATLAB程序是跟根据火箭发动机喷管的设计参数，包括推力，入口的压力和温度，出口的截面参数等设计拉乌尔喷管外形，并且对设计的结果进行验证。
English Description：
The MATLAB program is based on rocket engine nozzle design parameters, including thrust, inlet pressure and temperature, exporting section parameter design of Raoul nozzle shape and to validate the results of the design.