1305 3次元CFDを用いたロケットノズルに生じる非定常横推力に関する研究(GS-5 数値流体力学と乱流(2))

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Recently, the large side thrust is observed during start-up and shutdown sequences in the nozzle of the LE-7A rocket engine. The objective of the present paper is to clarify the mechanism producing the large side thrust during start-up sequence. The unsteady 3D Navier-Stokes equations are solved by using MUSCL-type TVD scheme and the SGS turbulence model of the LES with the LU-SGS implicit time marching. The results show that the interaction between the internal shock and the Mach disk causes the cap shock and trapped vortex. This trapped vortex develops with oscillation as the pressure ratio increases. Consequently, the development of this oscillation results in the simultaneous occurrence of the Free Shock Separation and the Restricted Shock Separation. This occurrence produces the large side thrust.
社団法人日本機械学会の論文
2001-03-16