Fast Flow Rate Control Technique for Rocket Engines Utilizing Electric Pump Cycle

The electric pump cycle, driven by an electric motor to power the pump, is emerging as a promising supply system in space propulsion due to its simple structure, reduced weight, and adaptable motor speed control. This study delves into high-speed flow control techniques within the electric pump cycle in propulsion systems. The research aims to identify potential issues associated with flow control methods and determine the most optimal approach. An experimental apparatus was developed to simulate an electric pump cycle supply system, incorporating an electric motor, centrifugal pump, and valve. Traditionally, flow control in electric pump cycles relies on adjusting the pump's rotational speed. However, this study introduces valve control alongside electric motor speed modulation to control flow rates. Both independent control of each component and simultaneous control of both were investigated. In the latter scenario, a method involving sequential pump speed adjustments and valve actuation at different intervals was explored. Various flow control methods were tested, and the results highlighted the pros and cons of each approach. Notably, simultaneous control of both components demonstrated favorable outcomes, emphasizing enhanced convergence and stability of flow control.