# Characterization of Supersonic Compressible Fluid Flow Using High-Speed Interferometry

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## Abstract

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## 1. Introduction

## 2. Method

#### 2.1. Interferometry and Fluid Flow

#### 2.2. Spatial Carrier Interferometry

## 3. Materials and Methods

## 4. Results and Discussion

## 5. Conclusions

## Author Contributions

## Funding

## Data Availability Statement

## Acknowledgments

## Conflicts of Interest

## References

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**Figure 1.**Basic concept of the narrow channel measurement. Dashed rectangle represents the investigated area.

**Figure 3.**Scheme of the setup: LAS—laser, FS—fiber splitter, FF—fiber ferrule, L0 + L1 + L2—lens, MA—measured area, P0 + P1—pressure probes, WT—wind tunnel, NBS—beamsplitter, CAM—camera.

**Figure 4.**(

**a**) Intensity image (interferogram) captured during measurements, with the zoomed part showing the interference pattern, (

**b**) its Fourier spectrum, (

**c**) the phase change map with region of interest (ROI) marked by the dashed line, and (

**d**) unwrapped phase change map with ROI.

**Figure 5.**(

**a**) Density distributions for different regimes—comparison of measured data (

**left**) and the CFD simulations (

**right**); (

**b**) density values along the profile denoted in (

**a**) for regime #5.

**Figure 6.**Slope maps of measured (top—M) and simulated (bottom—S) density distributions in different flow regimes.

Regime | #1 | #2 | #3 | #4 | #5 |
---|---|---|---|---|---|

P_{out} (kPa) | 54.923 | 47.140 | 39.236 | 28.114 | 23.871 |

η [1] | 0.560 | 0.481 | 0.400 | 0.287 | 0.243 |

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**MDPI and ACS Style**

Psota, P.; Çubreli, G.; Hála, J.; Šimurda, D.; Šidlof, P.; Kredba, J.; Stašík, M.; Lédl, V.; Jiránek, M.; Luxa, M.;
et al. Characterization of Supersonic Compressible Fluid Flow Using High-Speed Interferometry. *Sensors* **2021**, *21*, 8158.
https://doi.org/10.3390/s21238158

**AMA Style**

Psota P, Çubreli G, Hála J, Šimurda D, Šidlof P, Kredba J, Stašík M, Lédl V, Jiránek M, Luxa M,
et al. Characterization of Supersonic Compressible Fluid Flow Using High-Speed Interferometry. *Sensors*. 2021; 21(23):8158.
https://doi.org/10.3390/s21238158

**Chicago/Turabian Style**

Psota, Pavel, Gramoz Çubreli, Jindřich Hála, David Šimurda, Petr Šidlof, Jan Kredba, Marek Stašík, Vít Lédl, Michal Jiránek, Martin Luxa,
and et al. 2021. "Characterization of Supersonic Compressible Fluid Flow Using High-Speed Interferometry" *Sensors* 21, no. 23: 8158.
https://doi.org/10.3390/s21238158