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.

该建议的目标是以高的时间和空间分辨率获得内燃机内部壁温的精确测量。为此，采用称为磷光体测温法的光学非接触式表面温度测量技术。这种方法利用了热成像磷光体，其光谱特性随温度变化。根据第一阶段建议的结果，应采用高采样率确定缸内壁温，以便监测各个循环的表面温度。这些测量的补充空间和时间分辨火焰可视化。因此，平面激光诱导的OH-自由基的荧光，这是非常适合火焰前锋可视化。通过使用高速激光器和摄像机壁温和火焰壁相互作用的同时检测与一度曲柄角的时间分辨率。除了数值模拟的验证，结果将提高组件的热应力，不稳定的热损失和火焰淬火附近的墙壁，这部分占污染物的主要生产的理解。