Mean temperatures of acetone, millimeter-sized, freely falling droplets in a nitrogen atmosphere are studied at two different locations downstream a capillary-type injector. Injection and ambient temperatures have been varied independently between 433 and 513 K and pressures from 2 to 6 MPa. The ratio of simultaneously measured laser-induced phosphorescence (LIP) and fluorescence (LIF) is shown to be a suitable approach for measuring temperatures in the given conditions. Cumulated uncertainties (2σ) of mean droplet temperatures of ±3 K are estimated. The temperatures measured in this study are partly compared to results of previous investigations where droplet temperatures have been estimated by an extrapolation of temperature mixture fraction data in the gas phase obtained from spontaneous Raman scattering. Overall a reasonable agreement has been observed which indicates the applicability of the previous approach for estimations based on the adiabatic mixing assumption and the extrapolation of the Raman-measured data.

在毛细管型注射器下游的两个不同位置研究了氮气氛中丙酮，毫米大小，自由下落的液滴的平均温度。注射温度和环境温度在433至513 K和2至6 MPa的压力之间独立变化。已显示同时测量的激光诱导磷光（LIP）和荧光（LIF）的比率是在给定条件下测量温度的合适方法。累计不确定度（2σ估计平均液滴温度为±3 K）。这项研究中测得的温度与以前的研究结果进行了部分比较，在以前的研究中，通过自发拉曼散射获得的气相温度混合物分数数据的外推法估算了液滴温度。总的来说，已经观察到合理的协议，这表明基于绝热混合假设和拉曼测量数据的外推法，先前方法的适用性。