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Experimental modelю Test facility
The test section was designed highly modular to be able to insert different test objects, so called ’bumps’, in a 100x120mm rectangular channel as sketched in figure 1(a). A continuous air supply is provided by a screw compressor driven by a 1MW electrical motor and capable of reaching a maximum mass ft>w up to 4.7 kg/s at 4 bar. A cooling system allows a temperature range from 30oC to 180oC. The adjustment of different valves also allows the exper
imentalist to control independently the mass fbw and the pressure level in the
test section in the respective range of M* — n 1 — n й "n’1 — P“irU^d
1.87 104 – 1.57 106 with d = 0.26m, pair 10-5 m2/s.
1.1 Test object and instrumentation
The investigated test object consists of a long 2D bump, presented in figure 1(b), which can slide through the width of the test section using the traverse mechanism and inflated O-ring sealing system. The nozzle geometry thus consists of a 100mm wide and 120mm high flat channel with a 10.48mm maximum thickness and 184mm long 2D bump on the lower wall. The beginning of the curvatures was chosen as the origin of the X-axis (x=0mm). The Y-axis and Z-axis were set to be aligned with the channels’s width and height respectively to form an orthogonal basis. The profile coordinates of the bump are presented in table A.1.
The bump is equipped with one row of 100 hot film sensors, and three staggered rows of 52 pressure taps each. The traverse mechanism fixed on the side window allows the displacement of both the pressure tap rows and the hot film sensors through the width of the channel. As a result, by sliding the 2D bump and successively position each rows of pressure taps at the same location in the channel will provide a spatial resolution measurements of 1.5mm for pressure measurements. Unsteady pressure measurements were performed using fast response Kulite transducers glued in protective pipes. Each pipe was designed with a locking device so that it could be inserted in any of the already instrumented pressure hole located underneath the sliding 2D bump.
