Combustion Characteristics of Multi-Element Swirl Coaxial Jet Injectors under Varying Momentum Ratios

The combustion characteristics of a staged cycle engine with an oxidizer-rich preburner were experimentally studied at different momentum ratios multi-element injectors. Propellants simultaneously supplied as liquid–liquid–liquid system, and injector was designed in which swirl coaxial jet is sprayed. burned the propellants inner chamber had temperature greater than 2000 K. To cool gas, liquid oxidizer to cooling channel outside injector. prevent turbine blades from melting, gas maintained below 700 confirm high-temperature inside low-temperature injector, three types injectors manufactured ratios: MR 3.0, 3.3, 3.7. In this study, results test for each type compared 30 s. For ORPB-A, pressure 18.5 MPaA, fuel mass flow rate 0.26 kg/s, 15.3 inlet 686 K obtained stability period 29.0–29.5 efficiency 98% 3.0 (ORPB-A), superior that other ratios. addition, during fluctuations characteristic velocity, pressure, propellant low, indicating stable. instability all less 0.8%, thus confirming excellent.