"Film Cooling" is used as an effective method to protect the surface of gas turbine parts which are exposed to high temperature environments.
In the vicinity of slot, i.e initial mixing region, free mixing layer and recirculating region are constructed by means of slot lip and two mixing jets.
In this experiment, free mixing layer and recirculating region are investigated by measuring the profiles of mean temperatures and temperature fluctuations. The turbulence quantities obtained from this experiment can be exploited as useful data for the development of numerically analyzing method.
From the analysis of velocity fluctuations profiles, it is recognized that the mixing of flow field occurred more rapidly in this experiment than in the case of two jets with same temperature, whereas the whole flow field phenomena are developing similarly between the two cases.
In the initial mixing region, the maximum value of temperature fluctuations has a tendency of increase along the downstream of slot in contrast to decreasing trend of velocity fluctuations.
And turbulent mixing coefficient can be correlated in terms of temperature fluctuations and velocity fluctuations as follows;
$C_m \approx -0.044<\frac{\theta'}{T}>_{max} + 0.15$
$C_m \approx 1.91\times10^{-3}<\frac{u'}{U}>_{max}-1.14\times10^{-2}$
