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Numerical Investigation of Centerbodiless RDE Design Variations

机译：无心RDE设计变化的数值研究

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The pressure gain of detonation has great potential to increase efficiency of cycles involving combustion. Rotating detonation engines (RDEs) have a great deal of promise as a detonation based combustor. The RDE's advantages over current pulsed detonation cycles include needing only a single initiation, having a more uniform exhaust pressure, compact design, and capability to process high flow rates. However, without consideration for pressure losses due to friction or shock strength, it is possible to lose the efficiency advantages RDEs have over conventional combustion. Some recent numerical studies have shown it may be possible to ignite an RDE that has only the outer wall, with air going through the center instead of a centerbody. These centerbodiless RDE Designs may entrain flow and impart momentum to more air, which may increase the total propulsive efficiency. In addition, their unique design with fewer walls for reflection may result in fewer reversals and blow-outs of the RDE. This may expand the range of operation for certain applications. A numerical study using a Reynolds-Averaged Navier-Stokes (RANS) Computational Fluid Dynamics (CFD) program Fluent, by ANSYS is being performed to test three dimensional (3D) configurations of centerybodyless RDE. The effect of various alterations to the design will be studied, including hydrogen injection hole size alteration, longitudinal walls, and an ejector. A simple Spalart-Allmaras turbulence model will be used to better simulate mixing of hydrogen and air. Detonation will test for steady operation for multiple cycles.
机译：爆炸的压力增益具有增加涉及燃烧的循环效率的巨大潜力。旋转爆震发动机（RDE）作为基于爆震的燃烧器具有很大的前景。与目前的脉冲爆震周期相比，RDE的优势包括仅需一次启动，排气压力更加均匀，紧凑的设计以及能够处理高流速的能力。但是，如果不考虑由于摩擦或冲击强度引起的压力损失，则可能会失去RDE相对于常规燃烧的效率优势。最近的一些数值研究表明，有可能点燃仅具有外壁的RDE，而空气会通过中心而不是中心体。这些无中心RDE设计可能会夹带气流并向更多的空气传递动量，从而可能会提高总推进效率。此外，其独特的设计以及更少的反射壁可减少RDE的反转和爆裂。这可以扩大某些应用的操作范围。正在使用ANSYS的Reynolds平均Navier-Stokes（RANS）计算流体动力学（CFD）程序Fluent进行数值研究，以测试无心体RDE的三维（3D）配置。将研究各种变更对设计的影响，包括氢气注入孔尺寸变更，纵向壁和喷射器。一个简单的Spalart-Allmaras湍流模型将用于更好地模拟氢和空气的混合。爆震将测试多个周期的稳定运行。

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