Abstract
This work applied fast mesoporous-particle-based pressure-sensitive paint (PSP) to obtain the time-resolved flow dynamics inside fluidic oscillators with jet speed up to 0.7 Mach and oscillation frequencies higher than 1 kHz. The frequency of the oscillator decreases as the feedback channel length increases. The frequency characteristics can be divided into a linear growth stage and a slow change stage. The external velocity characteristic of the oscillator also presented a double-peak phenomenon. Pressure wave reflection theory was used to explain the double-peak phenomenon of velocity, which was verified according to the PSP dynamic pressure field. In addition, the proper orthogonal decomposition method was applied to the PSP snapshots to further explain the dominating pressure propagation and small-scale pressure changes.
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Abbreviations
- HPCW:
-
High pressure compression wave
- LPEW:
-
Low pressure expansion wave
- MP-PSP:
-
Mesoporous-particle-based pressure-sensitive paint
- PC-PSP:
-
Polymer-ceramic pressure-sensitive paint
- PSP:
-
Pressure-sensitive paint
- POD:
-
Proper orthogonal decomposition
- Wind-off Average:
-
The average value of 5000 wind-off images
- Wind-on Average:
-
The average value of 10,000 wind-on images
- L f :
-
The length of the feedback channel
- P i :
-
Inlet pressure (bar)
- U max :
-
The velocity at the outlet of oscillator
- U max :
-
The maximum value of velocity at the outlet of oscillator
- U min :
-
The minimum value of velocity at the outlet of oscillator
- B 1 :
-
The center of the straight channel of the left half of the oscillator
- C 1 :
-
The entrance of the feedback channel of the left half of the oscillator
- C 2 :
-
The entrance of the feedback channel of the right half of the oscillator
- D 1 :
-
The center of the straight channel of the left half of the oscillator
- E 1 :
-
The exit of the feedback channel of the left half of the oscillator
- I on :
-
Intensity of PSP (count)
- I ref :
-
Intensity of PSP at reference condition (count)
- P ref :
-
Pressure at reference condition (kPa)
- t C1D1 :
-
The time for the high voltage to propagate from point C1 to point D1
- t C1E1 :
-
The time for the high voltage to propagate from point C1 to point E1
- t C1C2 :
-
The time for the high voltage to propagate from point C1 to point C2
- L C1E1 :
-
The length for the high voltage to propagate from point C1 to point E1
- U C1E1 :
-
The velocity for the high voltage to propagate from point C1 to point E1
- T t :
-
The transmission time of the pressure wave in the feedback channel on one side
- T s :
-
The deflection time of the main jet to overcome the wall effect
- c :
-
Velocity of sound
- St:
-
Stanton number (fLf/UC1E1)
- P 1 :
-
The increased pressure at point C1 is affected by the reflected high wave
- P 2 :
-
The value of pressure of C1 is higher than that of B1 when B1 and C1 both reach the highest point
- P 3 :
-
The difference between the lowest value of the pressure at point E1 and the lowest value of the pressure in the feedback channel
- P 4 :
-
The increased pressure at point D1 is affected by the reflected high wave
- P 5 :
-
The increased pressure at point D1 is affected by the reflected low wave
- ∆U :
-
The drop value of the exit velocity at the peak of the small wave
- ∆t :
-
The duration of the exit velocity at the peak of the small wave
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Acknowledgements
The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (12072196), Advanced Jet Propulsion Innovation Center (AEAC HKCX2019-01-016; HKCX2020-02-028), Aero-engine Foundation (6141B09050399), Science and Technology Commission of Shanghai Municipality (19JC1412900) and the Oceanic Interdisciplinary Program of Shanghai Jiao Tong University (SL2020MS006) extended to this study.
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Zhou, L., Wang, S., Song, J. et al. Study of internal time-resolved flow dynamics of a subsonic fluidic oscillator using fast pressure sensitive paint. Exp Fluids 63, 17 (2022). https://doi.org/10.1007/s00348-021-03370-w
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DOI: https://doi.org/10.1007/s00348-021-03370-w