Effects of Low Reynolds Number on Wake-Generated Unsteady Flow of an Axial-Flow Turbine Rotor
The unsteady flow field downstream of axial-flow turbine rotors at low Reynolds numbers was investigated experimentally using hot-wire probes. Reynolds number, based on rotor exit velocity and rotor chord length Reout,RT, was varied from 3.2×104 to 12.8×104 at intervals of 1.0×104 by changing the...
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| Format: | Article |
| Language: | English |
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Wiley
2005-01-01
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| Series: | International Journal of Rotating Machinery |
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| Online Access: | http://dx.doi.org/10.1155/IJRM.2005.1 |
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| _version_ | 1832556993143898112 |
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| author | Takayuki Matsunuma Yasukata Tsutsui |
| author_facet | Takayuki Matsunuma Yasukata Tsutsui |
| author_sort | Takayuki Matsunuma |
| collection | DOAJ |
| description | The unsteady flow field downstream of axial-flow turbine
rotors at low Reynolds numbers was investigated experimentally
using hot-wire probes. Reynolds number, based on rotor exit
velocity and rotor chord length Reout,RT, was
varied from 3.2×104 to 12.8×104 at intervals of
1.0×104 by changing the flow velocity of the wind
tunnel. The time-averaged and time-dependent distributions of
velocity and turbulence intensity were analyzed to determine the
effect of Reynolds number. The reduction of Reynolds number had a
marked influence on the turbine flow field. The regions of high
turbulence intensity due to the wake and the secondary vortices
were increased dramatically with the decreasing Reynolds number. The
periodic fluctuation of the flow due to rotor-stator interaction
also increased with the decreasing Reynolds number. The
energy-dissipation thickness of the rotor midspan wake at the low
Reynolds number Reout,RT=3.2×104 was 1.5
times larger than that at the high Reynolds number Reout,RT=12.8×104. The curve of the −0.2 power of the
Reynolds number agreed with the measured energy-dissipation
thickness at higher Reynolds numbers. However, the curve of the
−0.4 power law fitted more closely than the curve of the −0.2
power law at lower Reynolds numbers below 6.4×104. |
| format | Article |
| id | doaj-art-efee30b504ca4be3928ff6ebff9fd3a7 |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2005-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-efee30b504ca4be3928ff6ebff9fd3a72025-02-03T05:44:04ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342005-01-012005111510.1155/IJRM.2005.1Effects of Low Reynolds Number on Wake-Generated Unsteady Flow of an Axial-Flow Turbine RotorTakayuki Matsunuma0Yasukata Tsutsui1National Institute of Advanced Industrial Science and Technology (AIST), 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, JapanNational Institute of Advanced Industrial Science and Technology (AIST), 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, JapanThe unsteady flow field downstream of axial-flow turbine rotors at low Reynolds numbers was investigated experimentally using hot-wire probes. Reynolds number, based on rotor exit velocity and rotor chord length Reout,RT, was varied from 3.2×104 to 12.8×104 at intervals of 1.0×104 by changing the flow velocity of the wind tunnel. The time-averaged and time-dependent distributions of velocity and turbulence intensity were analyzed to determine the effect of Reynolds number. The reduction of Reynolds number had a marked influence on the turbine flow field. The regions of high turbulence intensity due to the wake and the secondary vortices were increased dramatically with the decreasing Reynolds number. The periodic fluctuation of the flow due to rotor-stator interaction also increased with the decreasing Reynolds number. The energy-dissipation thickness of the rotor midspan wake at the low Reynolds number Reout,RT=3.2×104 was 1.5 times larger than that at the high Reynolds number Reout,RT=12.8×104. The curve of the −0.2 power of the Reynolds number agreed with the measured energy-dissipation thickness at higher Reynolds numbers. However, the curve of the −0.4 power law fitted more closely than the curve of the −0.2 power law at lower Reynolds numbers below 6.4×104.http://dx.doi.org/10.1155/IJRM.2005.1axial-flow turbineunsteady flowrotor-stator interaction low Reynolds numberwakeenergy-dissipation thickness. |
| spellingShingle | Takayuki Matsunuma Yasukata Tsutsui Effects of Low Reynolds Number on Wake-Generated Unsteady Flow of an Axial-Flow Turbine Rotor International Journal of Rotating Machinery axial-flow turbine unsteady flow rotor-stator interaction low Reynolds number wake energy-dissipation thickness. |
| title | Effects of Low Reynolds Number on Wake-Generated
Unsteady Flow of an Axial-Flow Turbine Rotor |
| title_full | Effects of Low Reynolds Number on Wake-Generated
Unsteady Flow of an Axial-Flow Turbine Rotor |
| title_fullStr | Effects of Low Reynolds Number on Wake-Generated
Unsteady Flow of an Axial-Flow Turbine Rotor |
| title_full_unstemmed | Effects of Low Reynolds Number on Wake-Generated
Unsteady Flow of an Axial-Flow Turbine Rotor |
| title_short | Effects of Low Reynolds Number on Wake-Generated
Unsteady Flow of an Axial-Flow Turbine Rotor |
| title_sort | effects of low reynolds number on wake generated unsteady flow of an axial flow turbine rotor |
| topic | axial-flow turbine unsteady flow rotor-stator interaction low Reynolds number wake energy-dissipation thickness. |
| url | http://dx.doi.org/10.1155/IJRM.2005.1 |
| work_keys_str_mv | AT takayukimatsunuma effectsoflowreynoldsnumberonwakegeneratedunsteadyflowofanaxialflowturbinerotor AT yasukatatsutsui effectsoflowreynoldsnumberonwakegeneratedunsteadyflowofanaxialflowturbinerotor |