Plane mixing layers between burned gas and air was investigated to enhance the fundamental understanding of mixing characteristics and to facilitate the prescription of appropriate mathematical models.
The measurements were divided into two categories.
1) Temperature measurements
2) Flow visualization
Temperature measurements were performed with fine wire thermocouple (25㎛ dia. pt/pt-Rh 13%) compensated for the effects of thermal inertia. The quantities measured include the mean, rms, and correlations of the fluctuating temperatures. Flow visualization by optical methods includes instantaneous shadowgraphs and high speed movies. The Reynolds number based on the downstream distance and the air velocity is of the order $10^4$.
Some typical results from the investigations are as follows;
ⅰ) Mixing layer is characterized by large scale two-dimensional coherent structures, as has been observed recently in other mixing layer investigations.
ⅱ) These large scale eddies convect at nearly constant speed increasing their size.
ⅲ) Mixing and entrainment occur on a scale of the size of the large structure.
