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Rotating Detonation Wave Direction and the Influence of Nozzle Guide Vane Inclination
AIAA Journal ( IF 2.5 ) Pub Date : 2021-08-23 , DOI: 10.2514/1.j060594
Eric Bach 1 , Christian Oliver Paschereit 1 , Panagiotis Stathopoulos 1 , Myles D. Bohon 1
Affiliation  

This study describes a rotating detonation combustor (RDC) equipped with a set of nozzle guide vanes (NGVs) of variable number and inclination angle. Different instrumented guide vanes were manufactured and integrated for in situ measurements of static and stagnation pressure. It is shown that the mode progression and stagnation pressure gain of the device are not negatively affected by addition of the NGV stage. The positive effects of increasing mass flux, increasing NGV throat restriction, and decreasing air injector pressure drop are observed; however, no positive pressure gain is ultimately measured. A large number (N=680) of individual runs with a single detonation wave mode is statistically analyzed. In this analysis, the wave direction is automatically determined using a cross-correlation method, and binomial hypothesis testing is subsequently applied to the dataset. It is demonstrated that changing the vane inclination influences the preferential detonation wave direction such that the oblique shock is oriented at a less acute angle with respect to the vane’s axial chord. This results in less energy reflected back to the detonation wave and increases the ability of the vane stage to ingest the high-enthalpy flow, which also impacts a number of performance metrics. The combination of wave direction and vane inclination is categorized as either “aligned” or “misaligned” based on these observations. For the aligned configuration, the flow acceleration across the vane stage is larger, as is the static pressure difference between pressure and suction sides. The average flow Mach number at the NGV leading and trailing edges and the static pressure distribution in the converging–diverging vane section are shown to agree well with predicted values from isentropic relations. Pressure fluctuations are attenuated by some 80% across the NGV stage. The study demonstrates that for RDCs integrated into larger systems, it is imperative to know and control the wave direction, and that NGVs may be a useful tool to achieve this goal. It further underlines that a careful integration of turbomachinery with RDCs is key to harnessing the full potential of this promising technology.



中文翻译:

旋转爆轰波方向及喷嘴导叶倾角的影响

这项研究描述了一个旋转爆震燃烧器 (RDC),它配备了一组可变数量和倾斜角的喷嘴导向叶片 (NGV)。制造并集成了不同的仪表导流叶片,用于静压和滞压的原位测量。结果表明,添加 NGV 级不会对装置的模式进展和停滞压力增益产生负面影响。观察到增加质量通量、增加 NGV 喉道限制和减少空气喷射器压降的积极影响;然而,最终没有测量到正压力增益。大量的 (N=680) 对单个爆震波模式的单个运行进行统计分析。在此分析中,使用互相关方法自动确定波浪方向,随后将二项式假设检验应用于数据集。结果表明,改变叶片倾角会影响优先爆震波方向,使得斜激波相对于叶片的轴向弦以较小的锐角定向。这导致反射回爆震波的能量更少,并增加了叶片级吸收高焓流的能力,这也会影响许多性能指标。根据这些观察结果,波浪方向和叶片倾斜度的组合被归类为“对齐”或“未对齐”。对于对齐的配置,穿过叶片级的流动加速度更大,压力侧和吸入侧之间的静压差也更大。NGV 前缘和后缘的平均流量马赫数以及会聚-发散叶片部分的静压分布与等熵关系的预测值非常吻合。整个 NGV 阶段的压力波动衰减了约 80%。研究表明,对于集成到更大系统中的 RDC,了解和控制波浪方向势在必行,而 NGV 可能是实现这一目标的有用工具。它还进一步强调,涡轮机械与 RDC 的仔细整合是充分发挥这项有前途技术潜力的关键。NGV 前缘和后缘的平均流量马赫数以及会聚-发散叶片部分的静压分布与等熵关系的预测值非常吻合。整个 NGV 阶段的压力波动衰减了约 80%。研究表明,对于集成到更大系统中的 RDC,了解和控制波浪方向势在必行,而 NGV 可能是实现这一目标的有用工具。它还进一步强调,涡轮机械与 RDC 的仔细整合是充分发挥这项有前途技术潜力的关键。NGV 前缘和后缘的平均流量马赫数以及会聚-发散叶片部分的静压分布与等熵关系的预测值非常吻合。整个 NGV 阶段的压力波动衰减了约 80%。研究表明,对于集成到更大系统中的 RDC,了解和控制波浪方向势在必行,而 NGV 可能是实现这一目标的有用工具。它还进一步强调,涡轮机械与 RDC 的仔细整合是充分发挥这项有前途技术潜力的关键。整个 NGV 阶段的压力波动衰减了约 80%。研究表明,对于集成到更大系统中的 RDC,了解和控制波浪方向势在必行,而 NGV 可能是实现这一目标的有用工具。它还进一步强调,涡轮机械与 RDC 的仔细整合是充分发挥这项有前途技术潜力的关键。整个 NGV 阶段的压力波动衰减了约 80%。研究表明,对于集成到更大系统中的 RDC,了解和控制波浪方向势在必行,而 NGV 可能是实现这一目标的有用工具。它还进一步强调,涡轮机械与 RDC 的仔细整合是充分发挥这项有前途技术潜力的关键。

更新日期:2021-08-24
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