Discussion on flow-through phenomena in the air gauge cascade

• Autorzy: Jermak C. J.

Identyfikatory

DOI

10.1515/ama-2017-0006

• Języki publikacji: EN

Abstrakty

EN

In the paper, the flow-through phenomena in the air gauge are under discussion form the thermodynamic and gasodynamic perspective. The main elements of the cascade are considered the inlet nozzle (restriction), measuring chamber and the measuring nozzle with the measuring slot (displacement between the nozzle head and measured surface). The purpose of the analysis was to point out the impact on the metrological characteristics of the air gauge. In particular, attention was paid to the airflow through the measuring slot. Here, the complex phenomena take place, among others the supersonic areas and a “bubble ring,” which cause discontinuity and hysteresis in the static characteristic. On the other hand, the air stream expansion after the restriction (inlet nozzle) is observed in the measuring chamber. The point of the above discussion was to work out some recommendation on the nozzles geometry and the localization of the back-pressure measuring point in the chamber.

Słowa kluczowe

EN

air gauges; static metrological properties; flow-through phenomena; pressure fluctuations

• Wydawca: Oficyna Wydawnicza Politechniki Białostockiej
• Czasopismo: Acta Mechanica et Automatica
• Rocznik: 2017
• Tom: Vol. 11, no. 1
• Strony: 38--46
• Opis fizyczny: Bibliogr. 25 poz., rys., wykr.

Twórcy

autor

Jermak C. J.

• *Division of Metrology and Measurement Systems, Faculty of Mechanical Engineering and Menagement, Poznan University of Technology, Piotrowo 3, 61-138 Poznań, Poland

Bibliografia

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Uwagi

1. The investigations had been performed in frames of the projects CPBP 02.20 and KBN 1253/T07/00/18 financed by Polish Government.

2. Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017)