Supersonic Flow Mixing and Combustion Using Ramp Nozzle
Supersonic Flow Mixing and Combustion Using Ramp Nozzle
复制标题
使用斜坡喷嘴的超音速流动混合和燃烧
DOI：
10.2514/3.23953
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发表时间：
1992
影响因子：
1.9
通讯作者：
E. Gutmark
中科院分区：
文献类型：
--
作者：
K. Yu;K. Schadow;K. Kraeutle;E. Gutmark
一种特殊的超音速喷管在其膨胀侧具有五个后掠斜坡，称为RAMP喷管，用于增强马赫数2的射流与周围空气的混合，无论是静止还是以马赫数1.3流动。在几个流向站测量了超音速射流的总压分布，并从测量结果中推导出初始剪切层增长率。结果表明，RAMP喷管的比增长率比参考圆形喷管的轴对称超声速射流有明显的提高。在对流马赫数为0.23时增加44%，在0.86时增加110%。此外，超音速射流可视化使用平面米氏散射技术。RAMP膨胀射流的瞬时图像显示了大规模的组织良好的结构，类似于剪切层中的轴向涡流。这些结构的出现与初始剪切层生长速率的增加有关。最后，对于加力富油超声速射流，RAMP喷管显著地改变了加力燃烧特性。这表明超音速混合受到影响。
A special supersonic nozzle that features five swept ramps on its expansion side, called the RAMP nozzle, was used to enhance Mach 2 jet mixing with the surrounding air either at rest or flowing at Mach 1.3. The total pressure profiles of the supersonic jets were measured at several streamwise stations and the initial shearlayer growth rates were deduced from the measurements. The results showed that the special growth rate was significantly increased with the RAMP nozzle in comparison with axisymmetric supersonic jets discharging from reference circular nozzles. The increase was 44% at the convective Mach number of 0.23 and 110% at 0.86. Also, the supersonic jets were visualized using a planar Mie-scattering technique. Instantaneous images of the RAMP-expanded-jet showed large-scale well-organized structures that resembled axial vortices in the shear layers. The appearance of these structures was linked to the increase in the initial shear-layer growth rate. Lastly, for an afterburning fuel-rich supersonic jet, the RAMP nozzle changed the afterburning characteristics significantly. This suggests that the supersonic mixing is affected.