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本文阐述了一种应用近前向散射理论测量液雾颗粒尺寸的光学方法,还指明了在设计这种光学系统时的几个要点。为了获得真实的液滴尺寸,引用了一种数值变换技术,它能处理颗粒散射信号对通过测量体的轨迹的依从关系。文中给出了应用这种测量方法研究一个大气压下、液体碳氢燃料、一维火焰的燃烧速率试验研究的结果。试验结果与理论计算进行了比较。在考虑了试验的不确定性及计算中所用的气体性质的平均值引起的误差,则两者符合程度是好的。因此,在室温下和燃烧温度下测量液滴尺寸,这是一种有用的测量技术。
This article describes an optical method for measuring the particle size of liquid mist using near-forward scattering theory and points out some of the key points in the design of such an optical system. In order to obtain the true droplet size, a numerical transformation technique is cited which deals with the dependence of the scattering signal of particles on the trajectory through the measuring body. In this paper, the results of a pilot study on the combustion rate of a liquid hydrocarbon fuel and one-dimensional flame at atmospheric pressure are given using this measurement method. The experimental results are compared with the theoretical calculations. It is good to consider both the experimental uncertainty and the error caused by the average value of the gas properties used in the calculation. Therefore, measuring the droplet size at room temperature and at the combustion temperature is a useful measurement technique.