Frequency Response of RC Propellers to Streamwise Gusts in Forward Flight
The RC propeller performance under steady and sinusoidally time-varying freestream (stream-wise or longitudinal gust) was investigated in the University of Dayton Low-Speed Wind Tunnel (UD-LSWT) in the open-jet configuration. The propellers were tested at varying incidence angles and reduced frequen...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-05-01
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| Series: | Wind |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2674-032X/3/2/15 |
| _version_ | 1797592251823554560 |
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| author | Jielong Cai Sidaard Gunasekaran |
| author_facet | Jielong Cai Sidaard Gunasekaran |
| author_sort | Jielong Cai |
| collection | DOAJ |
| description | The RC propeller performance under steady and sinusoidally time-varying freestream (stream-wise or longitudinal gust) was investigated in the University of Dayton Low-Speed Wind Tunnel (UD-LSWT) in the open-jet configuration. The propellers were tested at varying incidence angles and reduced frequencies. The streamwise gust was created by actuating the shuttering system located at the test section exit and was characterized using hot-wire anemometry. A system identification model was developed for the shuttering system to determine the shutter actuation profile that would result in a sinusoidal gust in the test section. Changes in propeller thrust, power, and pitching moment were observed with an increase in propeller incidence angle under the steady freestream. The propeller’s steady freestream performance was then used to predict response under periodic streamwise gusts in edgewise flight. Below a reduced frequency of 0.2, the propeller response agrees with the prediction model, suggesting that the propeller response is quasi-steady. At reduced frequencies higher than 0.2, a reduction in mean thrust and pitching moment and significant phase lag was observed. |
| first_indexed | 2024-03-11T01:48:48Z |
| format | Article |
| id | doaj.art-27b98609327542e2921deb4286c53649 |
| institution | Directory Open Access Journal |
| issn | 2674-032X |
| language | English |
| last_indexed | 2024-03-11T01:48:48Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Wind |
| spelling | doaj.art-27b98609327542e2921deb4286c536492023-11-18T13:06:45ZengMDPI AGWind2674-032X2023-05-013225327210.3390/wind3020015Frequency Response of RC Propellers to Streamwise Gusts in Forward FlightJielong Cai0Sidaard Gunasekaran1Mechanical and Aerospace Engineering, University of Dayton, Dayton, OH 45469, USAMechanical and Aerospace Engineering, University of Dayton, Dayton, OH 45469, USAThe RC propeller performance under steady and sinusoidally time-varying freestream (stream-wise or longitudinal gust) was investigated in the University of Dayton Low-Speed Wind Tunnel (UD-LSWT) in the open-jet configuration. The propellers were tested at varying incidence angles and reduced frequencies. The streamwise gust was created by actuating the shuttering system located at the test section exit and was characterized using hot-wire anemometry. A system identification model was developed for the shuttering system to determine the shutter actuation profile that would result in a sinusoidal gust in the test section. Changes in propeller thrust, power, and pitching moment were observed with an increase in propeller incidence angle under the steady freestream. The propeller’s steady freestream performance was then used to predict response under periodic streamwise gusts in edgewise flight. Below a reduced frequency of 0.2, the propeller response agrees with the prediction model, suggesting that the propeller response is quasi-steady. At reduced frequencies higher than 0.2, a reduction in mean thrust and pitching moment and significant phase lag was observed.https://www.mdpi.com/2674-032X/3/2/15RC propellerunsteady propeller responsestreamwise gustsedgewise flightreduced frequency |
| spellingShingle | Jielong Cai Sidaard Gunasekaran Frequency Response of RC Propellers to Streamwise Gusts in Forward Flight Wind RC propeller unsteady propeller response streamwise gusts edgewise flight reduced frequency |
| title | Frequency Response of RC Propellers to Streamwise Gusts in Forward Flight |
| title_full | Frequency Response of RC Propellers to Streamwise Gusts in Forward Flight |
| title_fullStr | Frequency Response of RC Propellers to Streamwise Gusts in Forward Flight |
| title_full_unstemmed | Frequency Response of RC Propellers to Streamwise Gusts in Forward Flight |
| title_short | Frequency Response of RC Propellers to Streamwise Gusts in Forward Flight |
| title_sort | frequency response of rc propellers to streamwise gusts in forward flight |
| topic | RC propeller unsteady propeller response streamwise gusts edgewise flight reduced frequency |
| url | https://www.mdpi.com/2674-032X/3/2/15 |
| work_keys_str_mv | AT jielongcai frequencyresponseofrcpropellerstostreamwisegustsinforwardflight AT sidaardgunasekaran frequencyresponseofrcpropellerstostreamwisegustsinforwardflight |