For turbine blade, film cooling applications, researchers are interested to understand how the film cooling flow interacts with the mainstream flow passing over a surface. To model leading edge film cooling, a cylinder with multiple rows of film cooling holes near the leading edge is placed in a low speed wind tunnel (as shown in the figure). The required compressed air (25°C), piping, flow meters, materials, and a full 2D PIV system are available for your use.
a. Show an overall sketch of your experimental test loop and the associated equipment and instrumentation required to conduct the proposed PIV test, i.e., sketch your overall experimental setup along with a suitable flow measuring device, detail your test section design with proper materials, describe the 2D, PIV measurement principle, and the detailed measurement procedures at the steady-state condition.
b. Based on the wind tunnel flow and cooling flow capability, one steady-state blowing ratio (cooling to mainstream mass flux ratio) will be tested: M = 1.0. What measurement planes should be selected to gain the best understanding of the coolant-to-mainstream interaction? Sketch and discuss the expected results from the PIV method.
c. Discuss the factors influencing the experimental uncertainty for the experiment.