Abstract
The solid-fuel ramjet (SFRJ) motor is the most favorable air-breathing propulsive system and a suitable option for extending the speed and range of some military applications as in ramjet-powered missiles. However, SFRJ encountered severe challenges associated with low regression rate, as this latter plays an important role on the performance of the solid-fuel ramjet motor. To improve the solid-fuel ramjet's regression rate, this paper proposes new configuration which employs two solid fuel tubular grains with keeping overall simplicity of classic SFRJ motor, then the new design is numerically investigated by a developed in-house CFD code. The developed code is used to estimate Reynolds-averaged Navier–Stokes equations of reacting, unsteady, turbulent, and swirling flow which is validated and verified for several test cases. The numerical results for proposed designs are compared with classic SFRJ. The results reveal significant increase in solid fuel regression rate and heat transferred into grain's interior surface. Moreover, the thrust, specific impulse, and characteristics velocity are increased as well.
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