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首页> 外文会议>AIAA aerospace sciences meeting;AIAA SciTech forum >Evaluation of vibrational excitation in a microwave plasma-enhanced flame using hybrid fs/ps CARS
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Evaluation of vibrational excitation in a microwave plasma-enhanced flame using hybrid fs/ps CARS

机译：使用混合fs / ps CARS评估微波等离子体增强火焰中的振动激发

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Microwave-plasma enhanced flames have shown increased flame speeds and improved lean mixture burning due to highly localized energy addition restricted to the reaction front. For the considered reduced electric field strengths of pulsed microwave systems, a significant amount of direct vibrational excitation is anticipated. Hybrid fs/ps CARS is employed to measure vibrational excitation in a laminar premixed hydrocarbon flame following pulsed microwave excitation. Rotational and vibrational CARS measurements are used to observe the energy thermalization in the microwave and post-microwave plasma region. Two distinct processes of vibrational excitation are observed: one fast increase during and following the microsecond-duration microwave pulse, and a second vibrational-translational relaxation process on timescales shorter than the relevant convective timescale. The degree of vibrational excitation and rate of thermalization of the deposited microwave energy are crucial parameters in considering the optimal usage of pulsed microwave plasmas in flame stabilization and control approaches.
机译：微波等离子体增强的火焰显示出增加的火焰速度和改善的稀薄混合物燃烧，这是由于限制在反应前沿的高度局部能量添加所致。对于考虑降低的脉冲微波系统的电场强度，可以预期会有大量的直接振动激发。混合fs / ps CARS用于在脉冲微波激发之后测量层状预混烃火焰中的振动激发。旋转和振动CARS测量用于观察微波和微波后等离子体区域中的能量热化。观察到两个不同的振动激发过程：一个在微秒持续时间的微波脉冲期间和之后迅速增加，第二个振动-平移弛豫过程的时间尺度短于对流时间尺度。在考虑火焰稳定和控制方法中脉冲微波等离子体的最佳使用时，振动激发的程度和沉积的微波能量的热化率是至关重要的参数。

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