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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Planar measurements of spray-induced wall cooling using phosphor thermometry
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Planar measurements of spray-induced wall cooling using phosphor thermometry

机译：使用磷光体测温法进行喷涂壁冷却的平面测量

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摘要

The wall cooling induced by spray impingement is investigated using phosphor thermometry. Thin coatings of zinc oxide (ZnO) phosphor were applied with a transparent chemical binder onto a steel surface. Instantaneous spatially resolved temperatures were determined using the spectral intensity ratio method directly after the injection of UV-grade hexane onto the surface using a commercial gasoline injector. The investigations showed that 2D temperature measurements with high spatial and shot-to-shot precision of, respectively, 0.5 and 0.6 K can be achieved, allowing the accurate resolution of the cooling induced by the spray. The presence of a liquid film over the phosphor coating during measurements showed no noticeable influence on the measured temperatures. However, in some cases a change in the intensity ratio at the spray impingement area, in the form of a permanent "stain", could be observed after multiple injections. The formation of this stain was less likely with increasing annealing time of the coating as well as lower plate operating temperatures during the injection experiments. Finally, the experimental results indicate a noticeable influence of the thickness of the phosphor coating on the measured spray-induced wall cooling history. Hence, for quantitative analysis, a compromise between coating thickness and measurement accuracy needs to be considered for similar applications where the heat transfer rates are very high.
机译：使用磷光体温度研究喷雾冲击引起的壁冷却。将氧化锌（ZnO）磷光体的薄涂层用透明的化学粘合剂施加到钢表面上。使用商业汽油喷射器将UV级己烷直接在表面上直接使用光谱强度比方法测定瞬时空间分辨温度。该研究表明，可以实现具有高空间和射击精度的2D温度测量，分别为0.5和0.6K，允许喷雾诱导的冷却的精确分辨率。在测量期间，在磷光体涂层上存在液体膜的存在对于测量的温度没有显着的影响。然而，在一些情况下，在多次喷射后可以观察到在永久性“污渍”的形式下喷雾冲击区域的强度比的变化。这种染色的形成不太可能在注射实验期间增加涂层的退火时间以及下板操作温度的增加。最后，实验结果表明磷光体涂层厚度对测量的喷涂引起的壁冷却历史上显着影响。因此，为了定量分析，需要考虑涂层厚度和测量精度之间的折衷，以用于传热速率非常高的类似应用。

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