A modeling approach based on experimental verification for the erosive burning of ammonium perchlorate composite propellants is proposed. It retains the idea that erosive burning is due to the penetration of the flow turbulence within the flame height and to the consequent enhancement of the transport coefficients and of the heat flux to the surface. It aims at matching the levels of the models of the flow (a numerical shear-layer computation) and of the flame (a realistic diffusion flame applicable to large- and medium-size AP composite propellants—those most sensitive to erosive burning). Both the flow description and the computed erosive burning are successfully compared to experimental results: cold flow-porous wall simulation device with laser anemometry-measured velocity profiles and propellant erosive burning measured with an ultrasonic transducer on a separated generator-sample device. F h h