强制偏流喷管的数值仿真

THREE-DIMENSIONAL NUMERICAL SIMULATION OF FORCED DEFLECTION NOZZLES

关键词:  喷管气流  三维流  偏转  数值模拟

Key words:  Nozzle gas flow  Three dimensional flow  Deflection  Numerical simulation

摘要:

采用薄层Ｎ－Ｓ方程成功地求解了强制偏流喷管内的三维复杂流场，对通量项和压力项用ＶａｎＬｅｅｒ发展的矢通量分裂法进行了离散；对离散方程采用线超松驰方法迭代求解，在亚音速与超音速气流共同存在的出口边界分情况进行了处理。计算结果验证了强制偏流喷管具有自动补偿外界压力变化的能力，与实验结果基本吻合。

Abstract:

A numerical simulation of forced deflection nozzle has been accomplished successfully. The vector flux splitting method developed by Van Leer is used to spatial discretization of convective and pressure terms, the viscous terms are handled using finite volume equivalent of 2nd order accurate central differences. A special treatment is made in outlet boundary in which the subsonic and supersonic flow exist commonly.Block-Line-Gauss-Siedel method is used to solve thd differencing equations. The conputational results proved that the forced deflection nozzle has the ability to compensate the variation of environmental pressure automatically and are correlated well the experimental results.