Hot-Wire Response in Compressible Subsonic Flow

Souza, Fenella de; Tavoularis, Stavros

doi:10.2514/1.j059201

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…Then, the sensitivity coefficients for density and velocity become equal, and formally a simplified relation holds (7) The equality Su = S = Su was also observed by some authors [7,8] in high subsonic for wires operated at a sufficiently high overheat ratio. Still, other studies [6,9] indicated non-equal sensitivity coefficients. The equality of the two sensitivities coefficients significantly reduces the data reduction and calibration efforts, but it has to be proven individually for each hot-wire anemometer and flow situation.…”

Section: Hot-wire Heat Transfermentioning

confidence: 90%

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CFD-supported data reduction of hot-wire anemometry signals for compressible organic vapor flows

Hake

Sundermeier

Wiesche

et al. 2023

J. Phys.: Conf. Ser.

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For obtaining turbulent fluctuations in compressible organic vapor flows, computational fluid dynamics (CFD) analysis tools were used to support the data reduction process of hot-wire anemometry signals. It was found that CFD can help during the calibration process of actual hot-wire probes operated in the constant-temperature mode. Such an approach is beneficial for determining the dependency of the sensitivity coefficients on Reynolds and Mach numbers. Due to the small Kolmogorov scales, corrections are needed for probes with finite wire lengths. The experimental and numerical analysis considering the decay of turbulence downstream a grid indicated that the correction scheme proposed by Wyngaard leads to consistent results for compressible organic vapors. The new developments provide recommendations for obtaining turbulent quantities of compressible organic vapor flows utilizing hot-wire anemometry.

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Section: Hot-wire Heat Transfermentioning

confidence: 90%

“…By relating the heat transfer rate to the electrical voltage output E of the constant-temperature anemometer (CTA), it can be shown that the Nusselt number Nu is proportional to E 2 . Following de Souza and Tavoularis [6], it is hence appropriate to use the semi-empirical correlation…”

Section: Hot-wire Heat Transfermentioning

confidence: 99%

CFD-supported data reduction of hot-wire anemometry signals for compressible organic vapor flows

Hake

Sundermeier

Wiesche

et al. 2023

J. Phys.: Conf. Ser.

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“…In Eq. (6), fn depends on the momentum thickness of the boundary layer feeding the high-speed side of the shear layer 46 and is described by linear stability theory as 2fnΘU1=0.036.…”

Section: Computational Modelsmentioning

confidence: 99%

Experimental and computational investigation of Shack–Hartmann wavefront sensor measurements through a free shear layer

Wells,

Kalensky,

Rennie

et al. 2024

Opt. Eng.

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Experimental Shack-Hartmann wavefront sensor (SHWFS) measurements were collected for a laser beam that propagated through a weakly compressible shear layer. Complementary computational fluid dynamics (CFD) was also conducted to match the experiment. The path-integrated CFD results were then applied to a SHWFS model such that the experimental and CFD results could be compared. Using both the experimental and CFD wavefront results, it was found that, although the CFD results slightly overestimated the resultant wavefront error, the CFD and experimental results revealed extremely similar wavefront topology. In order to further examine the aberrations imposed onto the laser beam in both datasets, the SHWFS image-plane irradiance patterns and circulation of phase gradients were studied. Similar to the overall wavefront topology, these data reduction approaches revealed similar phenomena in both the experimental and CFD-modeled results. Specifically, appreciable circulation and beam spread of the SHWFS image-plane irradiance patterns were exhibited throughout the shear layer's braid region. Both of these findings suggest that sharp phase gradients exist in the weakly compressible shear layer and both (1) the SHWFS resolution and (2) the continuous nature of the phase estimate obtained using SHWFS data in a least-squares reconstruction algorithm make these phase gradients challenging to resolve. The findings presented here inform efforts looking to experimentally or computationally study aero-optical environments.

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“…In Eq. 6, f n depends on the momentum thickness of the boundary layer feeding the high-speed side of the shear layer 39 and is described by linear stability theory as…”

Section: Ansys Fluentmentioning

confidence: 99%

Experimental and computational investigation of laser beam propagation through a free shear layer

Wells,

Kalensky,

Rennie

et al. 2023

Unconventional Imaging, Sensing, and Adaptive Optics 2023

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Experimental Shack–Hartmann Wavefront Sensor (SHWFS) measurements were collected and examined to further understand image-plane irradiance pattern behavior in the presence of potentially sharp thermodynamic gradients. An analysis of path-integrated phase and image-plane irradiance pattern spreading discovered regions within a weakly compressible shear layer where sharp gradients were previously not observed. This paper describes the analysis process and shows results which suggest that Shack-Hartmann wavefront sensors are not adequately resolving sharp thermodynamic gradients in aberrating flows.

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Hot-Wire Response in Compressible Subsonic Flow

Cited by 6 publications

References 11 publications

CFD-supported data reduction of hot-wire anemometry signals for compressible organic vapor flows

CFD-supported data reduction of hot-wire anemometry signals for compressible organic vapor flows

Experimental and computational investigation of Shack–Hartmann wavefront sensor measurements through a free shear layer

Experimental and computational investigation of laser beam propagation through a free shear layer

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