This paper introduces a new idea to augment the fuel regression rate in solid fuel ramjets. The heat transfer rate from the reacting flow field into the surface of the solid fuel grain determines directly its regression rate in this propulsion system, which is very low in comparison with solid rocket motors leads the low thrust levels. This innovative simple practical method is based on the geometrical treatment of the fuel grain, making the smooth ribs as a wavy surface, to increase the turbulence and the heat transfer rate into the evaporating surface where the fuel flow rate is determined. The finite volume solver of the turbulent reacting compressible flow is developed to study the flow field where the burning rate is computed using the conjugate heat transfer for the solid fuel. The influence of the amplitude and the period of the cosine function as the fuel surface geometry are investigated on the regression rate, and it is shown that the amplitude is more effective, and utilizing such surface treatments helps to augment considerably the fuel average regression rate.

中文翻译：

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利用波浪形燃料表面提高固体燃料冲压发动机的性能

本文介绍了一种提高固体燃料冲压发动机燃料回归率的新思路。从反应流场到固体燃料颗粒表面的传热率直接决定了它在该推进系统中的回归率，与固体火箭发动机相比非常低导致低推力水平。这种创新的简单实用方法基于对燃料颗粒的几何处理，将光滑的肋条制成波浪形表面，以增加湍流和传热到确定燃料流量的蒸发表面的速度。开发了湍流反应可压缩流的有限体积求解器，用于研究使用固体燃料的共轭传热计算燃烧速率的流场。