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Instrumentation
The experiments were conducted in the Laboratory of the Fluid Dynamics at Lappeenranta University of Technology. The layout of the test facility can be seen in Fig. 1. The test stand allows the measurement of ambient pressure, temperature and humidity, mass fbw, inlet total pressure and temperature, outlet total pressure and temperature, rotational speed and input power. The compressor can be monitored on-line with the help of an in-house developed data acquisition program.
The unsteady static pressure inside the vaneless diffuser was measured using Kulite XTC-190 miniature transducer. The pressure transducer is mounted to the shroud wall in the diffuser inlet and to the hub wall in the diffuser outlet. The unsteady pressure was also measured at three different circumferential angles 78°, 168° and 348° in the diffuser inlet and outlet (see Fig. 2).
Ami ;-n’ temperature.
pressure and hunurutv
Flow stiarghtener
Inlet temperature
Outlet
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power
Figure 1. The compressor test facility
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Figure 2. The location of the unsteady pressure transducers |
