In-cylinder wall temperature measurements using Thermographic Phosphors and Laser-induced Fluorescence Spectroscopy

使用热成像荧光粉和激光诱导荧光光谱测量缸内壁温度

• 批准号: 129883407
• 负责人: Professor Dr. Andreas Dreizler
• 金额: --
• 依托单位: Fachgebiet Reaktive Strömungen und Messtechnik (RSM)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/129883407?language=en
• 关键词: cylinder; wall; temperature; measurements; using

The goal of this proposal is to obtain precise measurements of wall temperatures inside internal combustion engines with high temporal and spatial resolution. For this purpose, an optical non-contact surface temperature measurement technique called phosphor thermometry is employed. This method takes advantage of thermographic phosphors, whose spectral properties change with temperature. Based on the results of the first period of proposal, in-cylinder wall temperatures are to be determined with high sampling rates in order to monitor surface temperatures of individual cycles. These measurements are complemented by spatially and temporally resolved flame visualizations. Therefore planar laser-induced fluorescence of the OH-radical is employed, which is well suited for flame front visualizations. By the use of high-speed-lasers and-cameras wall temperatures and flame-wall-interactions are detected simultaneously with a temporal resolution of one degree of crank angle. Besides the validation of numerical simulations, the results will improve the understanding of component thermal stress, instationary heat-losses and flame-quenching in the vicinity of walls, which partly accounts for primary production of pollutants.

该提案的目标是以高时间和空间分辨率获得内燃机内部壁温的精确测量。为此，采用了一种称为荧光测温法的光学非接触式表面温度测量技术。该方法利用了热成像荧光粉，其光谱特性随温度而变化。根据第一阶段提案的结果，将以高采样率确定缸内壁温度，以便监测各个循环的表面温度。这些测量得到空间和时间分辨火焰可视化的补充。因此，采用 OH 自由基的平面激光诱导荧光，这非常适合火焰锋可视化。通过使用高速激光器和相机，可以以一度曲柄角的时间分辨率同时检测壁温和火焰壁相互作用。除了数值模拟的验证之外，结果还将提高对部件热应力、瞬时热损失和墙壁附近火焰淬火的理解，这在一定程度上解释了污染物的初级产生。