对不同类型喷管流场的数值分析

Numerical Analysis of the Flow Field of Different Types of Nozzles

为了研究不同喷管类型的内部流场特性,利用Fluent CFD软件对三种不同扩张角的锥形喷管和钟形喷管进行了仿真。在相同的边界条件下,所有喷管都能获得足够的推力。四个喷管所产生的推力没有显著差异。钟形喷管在马赫数、压力和温度方面均优于其它喷管。在三种不同扩张角的锥型喷管中,沿轴线上扩张角较大的喷管的马赫数较大。此外,在沿轴线上,膨胀角较大的喷管温度和压力较低,空气在喷管里膨胀得更充分。

In order to study the internal flow field characteristics of different nozzle types,this paper simulates the three de⁃signed conical nozzles with different expansion angles and bell-shaped nozzles by Fluent CFD software.Under the same boundary conditions,all nozzles can obtain sufficient thrust.The thrust generated by the four nozzles has not differ significantly.The perfor⁃mance of bell-shaped nozzle is better than others in Mach number,pressure and temperature.In three kinds of conical nozzles with different expansion angles,the Mach number of the nozzles with large expansion angle is larger at the same axis.In addition,the temperature and pressure of the nozzle with large expansion angle are lower at the same axis.The air expands more fully in the tube.