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A 2-Port, Space-Saving, Maintenance-Friendly Pneumatic Probe for Velocity Measurements

Olczyk A., Magiera R., Kabalyk K.

Metrology and Measurement Systems

2018

Vol. 25, nr 1

171--185

This paper presents the concept, design and experimental results of tests, in laboratory conditions, of a 2-port, space-saving pneumatic probe. The main features of the probe are a result of restrictions imposed by the functioning environment: a limited space for probe installation, the possibility of processing only two output signals and requirements for simplicity and reliability of the probe. A cylindrical shape of the probe tip is proposed as a general concept, similar to the classic, cylindrical, 3-port probe. The main difference arises in using only two pressure signals: one from the overpressure zone on the front side of the cylinder and another, from the underpressure zone on the back side. After performing an appropriate calibration procedure, it is possible to measure the flow velocity and correct the pressure difference obtained by means of a velocity coefficient kv. This paper also presents an analysis of the kv coefficient uncertainty to evaluate the quality of measurements.

Water tunnel for testing the measurement methods of local flow parameters

Najdecki S., Smolny A., Sobczak K.

Transactions of the Institute of Fluid-Flow Machinery

2006

nr 118

15-24

A configuration of the water tunnel with two independently controlled concurrent streams is presented. Two important zones of the flow, namely: an inner layer with even parameter profiles and a mixing layer between two streams, can be observed. The numerical simulation results obtained by means of the CFX-TASC flow code are compared with the experimental investigation results measured by a Pitot probe in the velocity range from 1.7 to 16 m/s.