Other issues are installing the instrumentation without disturbing the flow field into and out of the turbocharger. The turbine instrumentation will be installed in front of the turbine nozzle ring and at the turbine discharge plane. From inspection of casting drawings, there are locations where the casting can be drilled and tapped to insert a pressure tap and thermowell in front of the nozzle ring. The discharge instrumentation will include a pitot tube for flow measurement. The discharge pressure will be measured from the static line of the pitot tube and the temperature will be measured with a thermocouple intruding from the side of the turbine discharge.
Several options are available to measure the compressor inlet and discharge conditions.
Since the compressor case is not water cooled, pressure and temperature taps can be installed almost anywhere. In addition to temperature and pressure, a pitot tube will be installed across the inlet plane. Task 2 Develop performance maps of the turbocharger turbine and compressor. The performance maps will create a large set of data that can be used to correlate the local measurements with true measurements from the NGML s Turbocharger Test and Research Facility. Task 3 Compare the common measurements with true measurements from test-stand instrumentation.