Study on Laser-Induced Acetone Fluorescence in Low-Temperature Gases of Nitrogen and Air

5National Defense Academy,1-10-20 Hashirimizu, Yokosuka, Kanagawa, 239-8686, JAPAN In the present study, the acetone LIF technique with nitrogen as the buffer gas was performed by the static chamber. And the fundamental experiment by using air was performed for the feasibility of the application of quantitative measurements in low temperature flows. The vacuum chamber was attached to achieve vacuum insulating in the test chamber. The size of internal cylindrical chamber is 83.1 mm diameter and 318 mm height. This system is composed of the light source, the optical system, the seeder, the test chamber, and the measuring instruments. Nd:YAG laser with a forth harmonic mode of 266nm is used as the light source . The results are as follows. It is shown that the absorption cross section of acetone shows almost constant value. The fluorescence intensity in both of nitrogen and air slightly increases together with the temperature decrease. And the experimental results are comparatively corresponding to the model curve. Also the flow visualization of the underexpanded air jet was performed by utilizing the acetone PLIF technique. The photograph shows the detail characteristics of the underexpanded jet.