Parametric model and design of full flow staged combustion cycle engine system for (Ⅰ) engine balance characteristics

The full flow staged combustion (FFSC) cycle engine balance model was established and the pressure relationship between the fuel-rich flow and the oxygen-rich flow was added in this model.These results show that (1) mixture ratios of preburners are matched for each other,mixture ratio of ox-rich preburner decreases with increasing mixture ratio of fuel-rich preburner,helping to balance the work of two side preburner gases;(2) with the increase of mixture ratio of fuel-rich preburner,the preburner gas temperature is enhanced,the fuel-rich preburner gas mass flowrate is enlarged (the ox-rich preburner gas mass flowrate reduced),the working ability of preburner gas is reinforced,and the fuel pump lift falls down(the oxidizer pump lift ascends);(3) the mixture ratio of preburner determines the preburner gas temperature,influences the preburner gas properties,participates in the mass flow distribution,controls the working ability of preburner gas,and then affects the pump lift.