Abstract
A newly -veloped light collecting probe named the 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 arri val time difference of the propagating flame front, the flame propagation speed is calculated 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 twopoint delay-time method 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 ~lay-time method with two MICRO probes is very useful and convenient to obtain the flame propagation speed and that the flame propagation speed is different depending on the spray properties.
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Tsushima, S., Akamatsu, F., Katsuki, M. (2000). Application of New Light Collection Probe with High Spatial Resolution to Spark-Ignited Spherical Flames. In: Adrian, R.J., Durão, D.F.G., Durst, F., Heitor, M.V., Maeda, M., Whitelaw, J.H. (eds) Laser Techniques Applied to Fluid Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-56963-0_27
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DOI: https://doi.org/10.1007/978-3-642-56963-0_27
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