Parametric model and design of full flow staged combustion cycle engine system for (II) parameterization design

Based on the full flow staged combustion (FFSC) cycle engine balance model, three parameters were selected for the engine system design, such as hydrogen transpiration cooling mass flow rate, combustion chamber pressure and combustion chamber mixture ratio. These results show that, when the thrust and nozzle expansion ratio are kept constant: (1) with the increase of hydrogen transpiration cooling mass flow rate, the fuel pump lift ascends rapidly and the oxidizer pump lift falls down; (2) with the increase of combustion chamber pressure, the pump lift ascends linearly before combustion chamber pressure at 20 MPa and rapidly after 20 MPa, so 20 MPa is recommended for combustion chamber pressure; (3) with the increase of combustion chamber mixture ratio, the fuel pump lift ascends linearly, the oxidizer pump lift reduces rapidly and then slowly, so seven is recommended for combustion chamber mixture ratio. The effects of these design parameters on engine system parameters offer a reasonable range for engine system design.