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Common measurements of compressor inlet and outlet air parameters during operation rarely help to understand turbocharger performance. This is due to the fact that the pressure ratio can remain almost constant at different air flow rates through the compressor for a substantial range of turbocharger operation. Measurement of airflow through the compressor helps to get a clear picture of turbocharger operation and degradation. A simple and modified mass flow meter has been tested which works on the principle of a hot wire anemometer and measures local velocity at its placement. Since local velocity inside turbocharger compressor varies with mass flow rate, the indicative velocity can be correlated to the flow rate. To determine proper location of this sensor inside the turbocharger, the flow field inside the compressor was studied by numerical simulation. Behavior of stream-wise and swirl velocity components were identified at different sections of the volume in order to pin-point a location where the flow field is well behaved, i.e., a relatively low degree of swirl and free form dynamic pulses from impeller rotation. The sensor was tested by placing it inside the turbocharger at the NGML test facility. Suitable algorithms were developed to correlate the readings of local velocity with flow rate through the compressor. The sensor readings were found to be an accurate representation of the compressor flow rate. Hence this flow meter may be used in compressor stations to monitor turbocharger performance.
Your Price $195.00
List Price $195.00