Influence of the Coanda effect on the RPCM chamber coefficient with zonal delivery of gaseous fuel components

A numerical simulation of mixture formation in a low-thrust rocket engine (LTRE) chamber with a zonal fuel and oxidizer supply system was conducted with a combustion chamber (CC) px pressure of 1 MPa. The dependences of the chamber coefficient on the combustion chamber diameter dks for various oxidizer excess ratios were determined and graphically presented based on data obtained from the numerical study. The gas-dynamic flow structure is presented for dks equal to 22 mm and 28 mm, and the mixing zones are identified. This demonstrates the influence of the Coanda effect, which involves the deflection of a gas jet toward a nearby solid surface and its subsequent movement along this surface, on the mixing of propellant components.

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