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A liquid rocket engine system can cause rapid pressure and temperature variations during the startup period. Thus the startup analysis is required to reduce time and expense for successful development of liquid rocket engine through the startup predict ion. In this study, a startup analysis simulator is developed for a staged combustion cycle engine powerpack. This simulator calculates propellant flow rates using pressure and flow rate balances. In addition, a rotational speed of turbopump is obtained as a function of time by mathematical modeling. A startup analysis result shows that the time to reach a steady-state and a rotational sp eed at the steady-state are 1.3 sec and 27,500 rpm, respectively. Moreover it can indicate proper start up sequences for stable operation.             .      ,      .                             .   ,   1.3    27,500 rpm .         .Key Words: Staged Combustion Cycle Engine Powerpack( ), Startup Analysis( ), Pressure and Flow Rate Balances(   ), Mathematical Modeling( )Received 3 June 2015 / Revised 19 August 2015 / Accepted 24 August 2015

Simulator Development for Startup Analysis of Staged Combustion Cycle Engine Powerpack