MEASUREMENT OF THE FLOW DISTRIBUTION IN AN INTERNAL COMBUSTION ENGINE BY HIGH SPEED PHOTOGRAPHS OF ELECTRO-OPTICAL SHUTTER

利用光电快门高速摄影测量内燃机中的流量分布

• 批准号: 62550162
• 负责人: TASAKA Hidenori
• 金额: $ 1.22万
• 依托单位: MIYAZAKI UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550162/
• 关键词: INTERNAL COMBUSTION ENGINE; FLOW VISUALIZATION; IMAGE PROCESSING; シリンダ内流速

It is very important to measure the flow velocity in the cylinder from the comustion analysis of an engine. One of the most effective method to measure the in-cylinder flow is the flow visualization technique to supplement the local velocity data such as from the Laser Doppler velocimetry. In this report. The locus of the tracer was taken by a high speed photographs using the electro-optical shutter named PLZT.At the first year. the basic research was made about the measuring system to take high speed photos. Polysteren was used for the tracer of the flow.The improvements of the second year are the adoption of the mechanical shutter in addition to the PLZT shutter to remove the back groud light of illumination and the utilization of the metaldehyde as the tracer. The speed of the mechanical shutter was risen to about 1/100 second and it brought the clear photos. The metaldehyde tracer was also effective to trace the cylinder flow.After these improvement. The accuracy of this system was examined to compare with the data of LDV. The spatial distribution of the in-cylinder flow and the cyclic variation of the flow pattern was clarified from the analysis of the images.The problems were also remained such as the analitical method of the three dimensional flow and the difficulties of the data processing.

从发动机的燃烧分析中测量气缸内的流速非常重要。测量缸内流量的最有效方法之一是流量可视化技术，以补充来自激光多普勒测速仪的局部速度数据。在这份报告中。示踪剂的轨迹是在第一年使用名为 PLZT 的光电快门通过高速照片拍摄的。对高速照片测量系统进行了基础研究。流动示踪剂采用Polysteren。第二年的改进是在PLZT快门的基础上采用机械快门来去除照明的背景光，并使用四聚乙醛作为示踪剂。机械快门速度提升至1/100秒左右，带来了清晰的照片。经过这些改进，四聚乙醛示踪剂对钢瓶流量的示踪也很有效。检验该系统的准确性并与LDV的数据进行比较。通过图像分析，明确了缸内流动的空间分布和流型的循环变化，但仍存在三维流动分析方法和数据处理困难等问题。