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本文使用三光束二维氩离子激光多普勒测速仪 (LDA)对平板和模拟燃烧室半圆型槽内的近壁气体速度分布进行了实验研究 ,并与用热线风速仪 (HWV)的测量结果进行了对比。结果显示 :热线风速仪在距离壁面较远处测量结果与理论计算值相近 ,距离壁面越近误差就越大。而LDA在整个测量区域的测量结果都有较高灵敏度。通过了解近壁气流速度分布 ,为研究内燃机缸内对流传热及建立数值模型提供了实验依据
In this paper, three-beam two-dimensional argon laser Doppler velocimeter (LDA) was used to experimentally study the near-wall gas velocity distribution in the semicircular groove of the flat plate and the simulated combustion chamber, and compared with the measurement results of the hot wire anemometer (HWV) Made a contrast. The results show that the hot air anemometer measured at a distance from the wall is close to the theoretical value, and the closer the distance to the wall, the greater the error. The LDA measurement results in the entire measurement area has a higher sensitivity. By knowing the velocity distribution of the near-wall airflow, it provides an experimental basis for studying the convection heat transfer and establishing the numerical model of the internal combustion engine