Specific mass flow rate measurements in a pulsating flow of gas

• Autorzy: Olczyk A.
• Języki publikacji: EN

Abstrakty

EN

The method of measurement of the specific mass flow rate in a pulsating flow by means of the Constant Temperature Anemometer (CTA) has been described. Special attention has been paid to the probe calibration problem. Different forms of the CTA characteristic have been analyzed. Example measurement results have been presented for chosen pulse frequencies. Apart from the measurements executed in one single point representing each control section, a flow field survey has been done in order to determine the velocity profile under the conditions of a pulsating flow. Probes have been displaced radially with a small step to cover the range from the pipe axis to its wall. It has been found that in the large field around the pipe axis, successive velocity plots are similar as far as their shape and phase shift are considered. Pulsations are damped and mean velocity decreases rapidly only in direct proximity of the pipe wall. It has been also shown that the presence of pulsations makes the mean velocity profile more uniform than in the case of a steady flow. Measurements have been also performed for the case of a reverse flow occurring in the pipe at resonance frequencies.

Słowa kluczowe

EN

pulsating flow; hot wire probe; calibration; approximation; flow field survey

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2008
• Tom: Vol. 15, nr 2
• Strony: 166--176
• Opis fizyczny: Bibliogr. 14 poz., rys., wykr.

Twórcy

autor

Olczyk A.

• Technical University of Lodz, Institute of Turbomachinery, Poland,

Bibliografia

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• 3. Bruun H. H.: Hot wire anemometry - principles and signal analysis. Oxford University Press 1999.
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• 5. Olczyk A., Hammoud A.A.: “Les problèmes des mesures de débit instantané `a l’aide d’une sonde a fil chaud”. Cieplne Maszyny Przepływowe - Turbomachinery, no. 686, 1993.
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• 7. TSI Inc.: Advantage to the look-up table approach of voltage-velocity conversion in thermal anemometry. Technical note. TSI website: www.tsi.com 2007.
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• 9. Dieterich Standard: Annubar flow measurement system. Product catalog, 1995.
• 10. Olczyk A.: “The Development of Measurement Methods in Application to Unsteady Work Parameters of a Turbocharger”. Cieplne Maszyny Przepływowe - Turbomachinery, no. 115, Łódz. International Conference SYMKOM 1999.
• 11. Kazimierski Z., Orzechowski Z.: Fluid mechanics. Łódz University of Technology Publishing House, 1986. (in Polish)
• 12. Olczyk A., Sobczak K.: “Unsteady Flow Modelling in Turbocharger Inlet Pipes”, Cieplne Maszyny Przepływowe - Turbomachinery, no. 122, Łódź 2002 - International Conference SYMKOM 2002.
• 13. Kabza Z., Pospolita J.: “A mathematical model for evaluation of the fluctuation range of the flow rate of a constricting device with a pulsating flow”. Measurement Techniques, vol. 36, no. 3, 1993.
• 14. Fortier A.: “Relation generale entre le debit volume instantane au niveau du dispositif deprimogene et la difference de pression instantanee entre deux points situes a l’amont et a l’aval du dispositif”. La Houille Blanche, no. 5, 1969.