Shock train leading edge (STLE) location control within a Dual-Mode Scramjet (DMSJ) flow path was demonstrated using an optical emission spectroscopy (OES) sensor for control feedback. Emission from electronically excited chemical species, OH and C, was observed within the combustor and used for feedback to control the STLE within the DMSJ isolator. An optical emission sensor was used to experimentally demonstrate STLE control using a Proportional-Integral (PI) controller. Feedback using this sensor was compared the traditional approach of using wall pressure sensors. Utilizing an OES sensor for feedback proved to be an effective method to estimate and control the STLE location and provided a smoother response than when utilizing discrete wall-based pressure measurements that tended to discretize the estimated STLE location. Characteristic Model-Based All-Coefficient Adaptive Control (ACAC) was also implemented and compared to the PI controller response using the OES signal as feedback. Plant changes were introduced in the form of mass addition downstream of the combustor and a reduction of fuel valve response. Experiments showed that the ACAC and PI controllers behave similarly both during nominal operation and with plant changes, though the ACAC controller tended to command the fuel valve more efficiently. This paper presents the first experimental demonstration of closed-loop control of the STLE location within a scramjet flow path when using OES sensor feedback. This is also the first demonstration of adaptive control of STLE location utilizing OES sensor feedback.

中文翻译：

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利用光学发射光谱控制双模超燃冲压发动机流路


使用光学发射光谱 (OES) 传感器进行控制反馈，演示了双模超燃冲压发动机 (DMSJ) 流路内的激波列前缘 (STLE) 位置控制。在燃烧室内观察到电子激发化学物质 OH 和 C 的发射，并用于反馈以控制 DMSJ 隔离器内的 STLE。使用光学发射传感器通过比例积分 (PI) 控制器通过实验演示 STLE 控制。使用该传感器的反馈与使用壁压力传感器的传统方法进行了比较。事实证明，利用 OES 传感器进行反馈是估计和控制 STLE 位置的有效方法，并且与利用离散的基于墙壁的压力测量（倾向于离散化估计的 STLE 位置）相比，提供了更平滑的响应。还实施了基于特征模型的全系数自适应控制 (ACAC)，并使用 OES 信号作为反馈与 PI 控制器响应进行比较。工厂的改变以燃烧室下游质量增加和燃料阀响应减少的形式引入。实验表明，尽管 ACAC 控制器倾向于更有效地控制燃油阀，但 ACAC 和 PI 控制器在标称运行期间和设备更改期间的行为相似。本文首次展示了使用 OES 传感器反馈时对超燃冲压发动机流路内 STLE 位置进行闭环控制的实验演示。这也是利用 OES 传感器反馈对 STLE 位置进行自适应控制的首次演示。