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首页> 外文会议>Selected Papers from the 9th International Symposium on Laser Techniques Applied to Fluid Mechanics Lisbon, Portugal, July 13-16, 1998 >V.3. Application of new light collection probe with high spatial resolution to spark-ignited spherical flames
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V.3. Application of new light collection probe with high spatial resolution to spark-ignited spherical flames

机译：V.3。新型空间分辨率高的集光探头在火花点火球形火焰中的应用

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摘要

A newly developed light collecting probe named th Multi-colored Integrated Cassegrain Receiving Optics (MICRO) is applied to spark-ignited spherical spray flames to obtain the flame propagation speed in freely falling droplet suspension produced by an ultrasonic atomizer. Two MICRO probes are used to monitor time-series signals of OH chemiluminescence from two different locations in the flame. By detecting the arival time difference of the propagating flame front, the flame propagation speed is claculated with a two-point delay-time method. In addition, time-series images of OH chemiluminescence are simultaneously obtained by an intensified high-speed digital CCD camera to ensure the validity of the two-point delay-time methody by the MICRO system. Furthermore, relationship between the spray properties measured by phase-Doppler technique and the flame propagation speed are discussed with three different experimental conditions by changing the fuel injection rate. It is confirmed that the two-point delay-time method with two MICRO probes is very useful and conventient to obtain the flame propagation speed and that the flame propagation speed is different depending on the spray properties.
机译：一种新开发的集光探头，称为多色集成卡塞格伦集成光学接收器（MICRO），用于火花点火的球形喷雾火焰，以获取由超声雾化器产生的自由下落的液滴悬浮液中的火焰传播速度。两个MICRO探头用于监视火焰中两个不同位置的OH化学发光的时间序列信号。通过检测火焰传播前沿的到达时间差，可通过两点延迟时间方法来确定火焰传播速度。此外，通过增强型高速数字CCD相机可同时获得OH化学发光的时序图像，以确保MICRO系统的两点延迟时间方法的有效性。此外，通过改变燃料喷射速率，在三种不同的实验条件下，讨论了通过相位多普勒技术测量的喷雾性能与火焰传播速度之间的关系。可以肯定的是，使用两个MICRO探针的两点延迟时间方法非常有用且方便，可获取火焰传播速度，并且火焰传播速度根据喷雾特性而有所不同。

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