Abstract
The current work presents simultaneous measurements of transient flow using fast-responding pressure- and temperature-sensitive paints in a long-duration hypersonic tunnel; the pressure, temperature and heat flux fields were obtained on a standard model (HB-2) at Ma = 5. Fast PSP and TSP were applied symmetrically on the model with low thermal conductivity. Both coatings were illuminated by a UV-LED, and unsteady pressure and temperature data were recorded at 500 Hz using a high-speed camera. Time-dependent temperature correction was applied on the PSP data based on the TSP results, while the heat flux was calculated from the time-resolved temperature fields using a 1D semi-finite heat conduction model. The temperature-induced errors in PSP data were effectively removed by the current compensation method. The pressure and heat flux results showed good agreement with the reference data from previous studies. The key events throughout the hypersonic tunnel run were captured by the unsteady PSP/TSP data, including the tunnel start-up, the flow build-up, the steady flow period and the tunnel shutdown. The differences caused by the change of attack angle were also clearly recognized. The current PSP/TSP system has shown great potential for unsteady flow diagnostics in hypersonic flows.
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Abbreviations
- C p :
-
Pressure coefficient
- c :
-
Specific heat
- h :
-
Depth from the model surface
- I :
-
Intensity
- I PSP :
-
Intensity of PSP
- I PSP_ref :
-
Intensity of PSP at reference condition
- I TSP :
-
Intensity of TSP
- I TSP_ref :
-
Intensity of TSP at reference condition
- I ref :
-
Intensity at reference condition
- K :
-
Ratio of temperature sensitivity between PSP and TSP
- k :
-
Heat conductivity
- L :
-
Length of the model
- Ma:
-
Mach number
- P :
-
Pressure
- P ref :
-
Pressure at reference condition
- P 0 :
-
Stagnation pressure
- P ∞ :
-
Static pressure
- q :
-
Heat flux
- q err :
-
Heat flux difference between two adjacent iterations
- q 0 :
-
Heat flux at stagnation point
- R :
-
Radius of the model
- Re :
-
Reynolds number
- r :
-
Coordinate in radial direction
- T :
-
Temperature
- T err :
-
Difference between the calculated temperature and the measured temperature
- T ref :
-
Temperature at reference condition
- T TSP :
-
Temperature measured by temperature-sensitive paint
- T 0 :
-
Stagnation temperature
- T 1 :
-
Temperature determined by heat flux through 1D heat conduction equation
- T ∞ :
-
Static temperature
- t :
-
Time from the start of the wind tunnel
- x :
-
Coordinate in streamwise direction
- ΔT :
-
Temperature change with respect to the wind-off temperature
- α :
-
Angle of attack
- ε :
-
Error tolerance
- θ :
-
Circumferential angle
- ρ :
-
Density
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Acknowledgements
This work was supported by the young faculty start-up fund from Shanghai Jiao Tong University, National Natural Science Foundation of China (NSFC No. 11502144) and funding from Gas Turbine Research Institute of Shanghai Jiao Tong University. The authors appreciate the assistance from Mr. Hongyi Shao during the heat flux calculation.
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Peng, D., Jiao, L., Sun, Z. et al. Simultaneous PSP and TSP measurements of transient flow in a long-duration hypersonic tunnel. Exp Fluids 57, 188 (2016). https://doi.org/10.1007/s00348-016-2280-z
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DOI: https://doi.org/10.1007/s00348-016-2280-z