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Hydraulic dual chamber, as the simulator for a dual pulse rocket motor, was tested by a high pressure device with various orifice-hole size being applied. Pressure difference occurs between 1st chamber and 2nd chamber depending on area ratio of the orifice to nozzle throat. Studying a design configuration of the orifice is essential to the motor development because pressure difference severely affects the rocket motor performance. It is noticed in this study that energy dissipation is caused by the vortex flow originating from the orifice as the 2nd chamber is operated. The flow field is simulated by a commercial computational fluid dynamics program, ANSYS FLUENT V14.5.         1, 2     .       2    1   .              . 2    1      1       .    CFD(Computational Fluid Dynamics) (ANSYS FLUENT V14.5)   .KeyWords:Dual Pulse Rocket Motor( ), Orifice(), Pressure Difference (), Hydraulic Dual Chamber(  ), Energy Dissipation( )Received 2 December 2013 / Revised 7 January 2014 / Accepted 13 January 2014

Analysis on the Internal Flow of the Hydraulic Dual Chambers Applying Various Orifice