High Pressure Optical Chamber for Fuel Injection and Spray Study

用于燃油喷射和喷雾研究的高压光学室

• 批准号: 439553-2013
• 负责人: Zheng, Ming
• 金额: $ 10.93万
• 依托单位: University of Windsor
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=510046
• 关键词: Pressure; Optical; Chamber; Fuel; Injection

In-depth understanding of fuel sprays becomes very important in clean combustion modes, such as diesel low temperature combustion (LTC). In diesel LTC, it is essential to form a lean, diluted and homogeneous cylinder charge in order to achieve low combustion temperatures and thus simultaneously ultra-low soot and nitrogen oxides (NOx) emissions. In the heterogeneous regions of the mixture, high temperature combustion prevails and leads to soot and NOx emissions. It is more important to enable biofuel clean combustions in diesel engines maintaining high efficiency. The fuel spray development is critically attributed to the impacts on the air-fuel mixture homogeneity. Sophisticated injection pressure and timing controls have been developed in PI's research to improve the fuel/air mixing effectively. For instance, with modern common rail injection systems, diesel fuel is injected at upstream pressure levels to 700~2200bar. Such elevated injection pressure is sought to enhance the fuel atomization and evaporation and to improve the fuel spray quality. Additionally, multiple-shot early injection strategies are generally applied to achieve homogeneous compression ignition. Thus, it will be very critical and cost effective for injection control and strategy development if the distribution and characteristics of the injected fuel are known at specific time or crank angle, particularly for biofuel and multi-fuel studies. It is a privilege to perform detailed quantitative evaluation and quality analyses using laser and high speed imaging technologies with a visually accessible chamber. The requested equipment is an EFS InjetVision Chamber system that can simulate the in-cylinder pressure of diesel engines with injection events. The system can be seamlessly integrated into our existing EFS injection testing bench. When spray tests are carried out in such an optical chamber, the injected fuel sprays can be clearly recorded with high speed camera from different viewing angles, making it feasible to quantitatively analyze the spray geometries in 2D and 3D. The injection process can be manifested by the time-resolved images. The optical analyses will cast light on the fuel distribution, atomization, and its mixing with air.

在柴油机低温燃烧等清洁燃烧模式中，对燃油喷雾的深入了解变得非常重要。在柴油LTC中，必须形成稀薄、稀释和均匀的气缸充气，以实现低燃烧温度，从而同时实现超低的碳烟和氮氧化物（NOx）排放。在混合物的非均质区域中，高温燃烧占主导地位，并导致烟尘和NOx排放。更重要的是使生物燃料在柴油机中保持清洁燃烧，保持高效率。燃油喷雾的发展主要归因于对混合气均匀性的影响。PI的研究开发了复杂的喷射压力和正时控制，以有效地改善燃油/空气混合。例如，对于现代共轨喷射系统，柴油燃料在上游压力水平下喷射到700~2200 bar。寻求这种升高的喷射压力以增强燃料雾化和蒸发并改善燃料喷雾质量。另外，通常应用多次喷射早期喷射策略来实现均质压缩点火。因此，这将是非常关键的和成本效益的喷射控制和策略的发展，如果喷射燃料的分布和特性，在特定的时间或曲柄角是已知的，特别是对于生物燃料和多燃料的研究。我们很荣幸能够使用激光和高速成像技术以及可视化的腔室进行详细的定量评估和质量分析。所要求的设备是EFS InjetVision Chamber系统，该系统可以模拟柴油发动机喷射事件的缸内压力。该系统可以无缝集成到我们现有的EFS喷射测试台架中。当在这样的光学室中进行喷雾测试时，可以用高速相机从不同视角清晰地记录喷射的燃油喷雾，从而可以定量分析2D和3D喷雾几何形状。注射过程可以通过时间分辨图像来表现。光学分析将有助于了解燃料的分布、雾化及其与空气的混合。