Spectroscopic Techniques versus Pitot Tube for the Measurement of Flow Velocity in Narrow Ducts

D’Amato, Francesco; Viciani, Silvia; Montori, Alessio; Barucci, M.; Morreale, C.; Bertagna, Silvia; Migliavacca, G.

doi:10.3390/s20247349

Cited by 2 publications

(1 citation statement)

References 20 publications

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“…Furthermore, they allowed studying the gas-dynamic parameters of supersonic microjets, paying attention to Pitot pressure variations on the jet axis associated with the wave structure of the jet and to distortions of the supersonic core length (Mironov et al [74]). In addition, Pitot tubes are used to measure flow velocity in narrow ducts (D'Amato et al [75]) and in hydraulic jumps developed in stilling basins (Macián-Pérez et al [76]).…”

Section: Pitot Tubesmentioning

confidence: 99%

A Review of Laboratory and Numerical Techniques to Simulate Turbulent Flows

Ferrari

Rossi²,

Bernardino

2022

Energies

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Turbulence is still an unsolved issue with enormous implications in several fields, from the turbulent wakes on moving objects to the accumulation of heat in the built environment or the optimization of the performances of heat exchangers or mixers. This review deals with the techniques and trends in turbulent flow simulations, which can be achieved through both laboratory and numerical modeling. As a matter of fact, even if the term “experiment” is commonly employed for laboratory techniques and the term “simulation” for numerical techniques, both the laboratory and numerical techniques try to simulate the real-world turbulent flows performing experiments under controlled conditions. The main target of this paper is to provide an overview of laboratory and numerical techniques to investigate turbulent flows, useful for the research and technical community also involved in the energy field (often non-specialist of turbulent flow investigations), highlighting the advantages and disadvantages of the main techniques, as well as their main fields of application, and also to highlight the trends of the above mentioned methodologies via bibliometric analysis. In this way, the reader can select the proper technique for the specific case of interest and use the quoted bibliography as a more detailed guide. As a consequence of this target, a limitation of this review is that the deepening of the single techniques is not provided. Moreover, even though the experimental and numerical techniques presented in this review are virtually applicable to any type of turbulent flow, given their variety in the very broad field of energy research, the examples presented and discussed in this work will be limited to single-phase subsonic flows of Newtonian fluids. The main result from the bibliometric analysis shows that, as of 2021, a 3:1 ratio of numerical simulations over laboratory experiments emerges from the analysis, which clearly shows a projected dominant trend of the former technique in the field of turbulence. Nonetheless, the main result from the discussion of advantages and disadvantages of both the techniques confirms that each of them has peculiar strengths and weaknesses and that both approaches are still indispensable, with different but complementary purposes.

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Section: Pitot Tubesmentioning

confidence: 99%

A Review of Laboratory and Numerical Techniques to Simulate Turbulent Flows

Ferrari

Rossi²,

Bernardino

2022

Energies

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Simultaneous measurement of multi-physics parameters in laminar flames based on background-oriented schlieren

Wu,

Liu,

Zhang

et al. 2025

Physics of Fluids

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The aerospace sector is experiencing an escalating need for the accurate measurement of high-temperature, high-speed flow field parameters. Conventional contact-based measurement methods are fraught with substantial limitations in terms of dynamic response and measurement precision, frequently leading to disruption of the flow field. In contrast, non-optical measurement techniques generally fall short in providing the capability for concurrent multi-parameter analysis. This study introduces a novel approach for concurrent measurement of multiple physical parameters in laminar flames utilizing the background-oriented schlieren technique. A sophisticated algorithm has been crafted to precisely determine light deflection angles in the context of near-field testing conditions through a detailed examination of the light transmission model. Following this, the axisymmetric refractive index field is meticulously reconstructed with the aid of Abel inversion techniques. Utilizing the Gladstone–Dale relationship, the spatial density distribution of the flow is quantified. Culminating this process, the temperature and velocity fields are inferred by applying the Navier–Stokes equations in conjunction with the ideal gas law, thereby offering a comprehensive analysis of the high-temperature, high-speed flow field parameters within the aerospace sector. The proposed method's viability and precision are confirmed through comparative experiments that utilized high-accuracy thermocouples and Pitot tubes for validation. The findings underscore that this method successfully delivers accurate and synchronized mapping of the density, velocity, and temperature distributions within laminar flames, thereby offering a robust experimental technique for the characterization of high-speed laminar flow fields.

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Spectroscopic Techniques versus Pitot Tube for the Measurement of Flow Velocity in Narrow Ducts

Cited by 2 publications

References 20 publications

A Review of Laboratory and Numerical Techniques to Simulate Turbulent Flows

A Review of Laboratory and Numerical Techniques to Simulate Turbulent Flows

Simultaneous measurement of multi-physics parameters in laminar flames based on background-oriented schlieren

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