Measurement of Instantaneous Pressure and Velocity in Nonsteady Three-Dimensional Water Flow by Means of a Combined Five-Hole Probe

Abstract

A new combined five-hole probe with hemispherical head of 2.0 mm diameter is developed for the measurement of nonsteady three-dimensional water flow. Each pressure hole is connected to a small semiconductor pressure transducer, which has a high frequency response, and the instantaneous pressure can be measured continuously by the probe. In the case of nonsteady flow, pressures detected by the probe are affected by the inertia due to flow unsteadiness. Therefore, in order to achieve an accurate nonsteady flow measurement, it is vital to reduce the inertial effects from the pressure reading. In the present study the inviscid flow analysis was carried out to evaluate the error due to the inertial effect, and the iterative correction procedure was examined by computer simulation.

Strömungsuntersuchung in hydrodynamischen Wandlern: Zusammenspiel von Messung und Rechnung

“…Sie konnten Frequenzen bis max. 1 kHz auf-15sen [28,34] und kamen in hydraulischen Maschinen mit geringen Schaufeldurchgangsfrequenzen zum Einsatz. Ebenfalls fiir Messungen in Wasser entwickehe Castorph [10] eine Sonde (G = 8 ram), bei der die zylindrischen Halbleiter-Druckaufnehmer mit Metallmembran im Sondenkopf eingeldebt waren.…”

Study on Multihole Pressure Probe System Based on LabVIEW

“…Measurements on unsteady flow are also an important application for the multihole probe. Matsunaga et al designed a new five‐hole probe combining with a pressure transducer for measuring 3‐D unsteady flow, and a calibration procedure was used to reduce the inertial effect due to the change in flow velocity, a satisfactory accuracy could be achieved. Argüelles Díaz et al developed a dynamic probe with three miniature pressure sensors being placed inside axial y , and compared the new data reduction technique with the traditional one.…”

Total and Static Quantity Measurements in Unsteady Flow — Effect of Unsteadiness

“…As an alternative approach to these techniques the last two decades have seen considerable progress towards the use of fast response aerodynamic probes based on conventional three and five hole probe geometry and silicon semi-conductor pressure transducers. Initially, these probes relied on sensors mounted in the interior of a probe (Senoo, Kita, Ookuma 1973;Matsunaga, Ishibashi, Nishi 1978). This first generation of probes, albeit with a faster response than conventional pneumatic probes, was still limited in bandwidth (typically 1kHz).…”