Details
Originalsprache | Englisch |
---|---|
Seiten (von - bis) | 2922-2931 |
Seitenumfang | 10 |
Fachzeitschrift | AIAA journal |
Jahrgang | 61 |
Ausgabenummer | 7 |
Frühes Online-Datum | 21 Mai 2023 |
Publikationsstatus | Veröffentlicht - Juli 2023 |
Abstract
Pneumatic probes such as five-hole probes (5HP) can conveniently measure three-dimensional flow angles, plus total and static pressure. In most applications, transducers are connected using pneumatic tubes, allowing the probe head to be highly miniaturized and robust. However, such “steady” probes are often used in unsteady flows, where they measure a pneumatically averaged flowfield that can differ from the time mean. To better understand these pneumatic averaging effects, an analytical framework is constructed using a quasi-steady model. Total and static pressure coefficients have a symmetric response to both positive and negative incidence.When incidence fluctuates, there is therefore a bias in the pneumatic average. These errors are evident in a shedding wake experiment, where a 5HP overestimates total pressure loss by up to 44% compared to a Kiel probe. These effects can be predicted by coupling an unsteady Reynolds-averaged Navier–Stokes calculation with the quasi-steady model. By predicting pneumatic averaging errors, the quasi-steady model can be used to obtain like-for-like validation of calculations against experimental data. Measurement data can also be corrected, provided that flow angle fluctuations can be measured or estimated. This approach can be readily used to postcorrect the large body of historical data likely to have been corrupted by pneumatic-averaging errors.
ASJC Scopus Sachgebiete
- Ingenieurwesen (insg.)
- Luft- und Raumfahrttechnik
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in: AIAA journal, Jahrgang 61, Nr. 7, 07.2023, S. 2922-2931.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Pneumatic-Probe Measurement Errors Causedby Fluctuating Flow Angles
AU - Coull, John D.
AU - Ng, Henry C.H.
AU - Dickens, Tony
AU - Serna, José
AU - Cengiz, Kenan
N1 - Funding Information: The authors would like to thank Rolls-Royce for funding and permission to publish, with particular thanks to Raul Vazquez and Duncan Simpson. Luca di Mare, University of Oxford, provided advice on the unsteady Reynolds-averaged Navier–Stokes calculation setup. Sam Grimshaw of the Whittle Laboratory, University of Cambridge, provided a sample calibration map.
PY - 2023/7
Y1 - 2023/7
N2 - Pneumatic probes such as five-hole probes (5HP) can conveniently measure three-dimensional flow angles, plus total and static pressure. In most applications, transducers are connected using pneumatic tubes, allowing the probe head to be highly miniaturized and robust. However, such “steady” probes are often used in unsteady flows, where they measure a pneumatically averaged flowfield that can differ from the time mean. To better understand these pneumatic averaging effects, an analytical framework is constructed using a quasi-steady model. Total and static pressure coefficients have a symmetric response to both positive and negative incidence.When incidence fluctuates, there is therefore a bias in the pneumatic average. These errors are evident in a shedding wake experiment, where a 5HP overestimates total pressure loss by up to 44% compared to a Kiel probe. These effects can be predicted by coupling an unsteady Reynolds-averaged Navier–Stokes calculation with the quasi-steady model. By predicting pneumatic averaging errors, the quasi-steady model can be used to obtain like-for-like validation of calculations against experimental data. Measurement data can also be corrected, provided that flow angle fluctuations can be measured or estimated. This approach can be readily used to postcorrect the large body of historical data likely to have been corrupted by pneumatic-averaging errors.
AB - Pneumatic probes such as five-hole probes (5HP) can conveniently measure three-dimensional flow angles, plus total and static pressure. In most applications, transducers are connected using pneumatic tubes, allowing the probe head to be highly miniaturized and robust. However, such “steady” probes are often used in unsteady flows, where they measure a pneumatically averaged flowfield that can differ from the time mean. To better understand these pneumatic averaging effects, an analytical framework is constructed using a quasi-steady model. Total and static pressure coefficients have a symmetric response to both positive and negative incidence.When incidence fluctuates, there is therefore a bias in the pneumatic average. These errors are evident in a shedding wake experiment, where a 5HP overestimates total pressure loss by up to 44% compared to a Kiel probe. These effects can be predicted by coupling an unsteady Reynolds-averaged Navier–Stokes calculation with the quasi-steady model. By predicting pneumatic averaging errors, the quasi-steady model can be used to obtain like-for-like validation of calculations against experimental data. Measurement data can also be corrected, provided that flow angle fluctuations can be measured or estimated. This approach can be readily used to postcorrect the large body of historical data likely to have been corrupted by pneumatic-averaging errors.
UR - http://www.scopus.com/inward/record.url?scp=85175425689&partnerID=8YFLogxK
U2 - 10.2514/1.J062569
DO - 10.2514/1.J062569
M3 - Article
AN - SCOPUS:85175425689
VL - 61
SP - 2922
EP - 2931
JO - AIAA journal
JF - AIAA journal
SN - 0001-1452
IS - 7
ER -