Um cálculo da espessura da camada limite

Ferreira, G. F. Leal

doi:10.1590/s0102-47442002000100003

Cited by 2 publications

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“…Using the instrumentation physical proprieties, Equation (11) suggests that, for the worse situation, when 0, and = 5 m/s, a wing surface deflection of 0.6 mm is expected. For the same situation, the minimum boundary layer thickness can be calculated, as suggested by Ferreira [43] The tensile strength of the standard fabric is exceptionally high compared to the load imposed by small sensors. For very small deflections and neglecting the fabric specific weight, the weight of the sensor not sustained by the local differential pressure is compensated by the vertical component of fabric tension generated by inflation.…”

Section: Mechanical and Aerodynamic Constraintsmentioning

confidence: 99%

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Wind-Tunnel Measurement of Differential Pressure on the Surface of a Dynamically Inflatable Wing Cell

Benedetti

Veras

2021

Aerospace

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An instrumentation system for in-situ measurement of the inner-outer pressure differential at the upper and lower surfaces of dynamically inflatable wings is designed and tested, revealing important insights into the aerodynamic characteristics of inflatable airfoils. Wind tunnel tests demonstrated full capability of low-pressure differential readings in the range of 1.0–120 Pa, covering speeds from 3 to 10 m/s at angles of attack from −20 to +25°. Readings were stable, presenting coefficients of variation from 2% to 7% over the operational flight envelope. The experimental data confirmed the occurrence of a bottom leading-edge recirculation bubble, linked to the low Reynolds regime and the presence of an air intake. It supported the proposition of a novel approach to aerodynamic characterization based on local pressure differentials, which takes in account the confined airflow structure and provides lift forces estimations compatible with practical observation. The results were also compatible with data previously obtained following different strategies and were shown to be effective for parameterizing the inflation and stall phenomena. Overall, the instrumentation may be applied straightforwardly as a flight-test equipment, and it can be further converted into collapse alert and prevention systems.

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Section: Mechanical and Aerodynamic Constraintsmentioning

confidence: 99%

“…Using the instrumentation physical proprieties, Equation (11) suggests that, for the worse situation, when C p = 0, and V ∞ = 5 m/s, a wing surface deflection of 0.6 mm is expected. For the same situation, the minimum boundary layer thickness can be calculated, as suggested by Ferreira [43] using…”

Section: Mechanical and Aerodynamic Constraintsmentioning

confidence: 99%

Wind-Tunnel Measurement of Differential Pressure on the Surface of a Dynamically Inflatable Wing Cell

Benedetti

Veras

2021

Aerospace

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Design and development of a low-cost open-type wind tunnel

Vieira,

Farias

2024

International Journal of Mechanical Engineering Education

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A wind tunnel is a device that facilitates the study of fluid flow behavior around the geometry under investigation. However, not everyone has access to a wind tunnel, and some educational institutions have initiated their own projects to construct these facilities. In light of this, we aim to present a more accessible alternative for individuals who want to build their own wind tunnel. Consequently, we have designed and developed a low-cost, open-type wind tunnel, and have captured photographs to facilitate a qualitative comparison between the streamlines obtained through the tunnel and those generated by computational simulations. Our research findings confirm that the affordable wind tunnel can produce good results, thereby establishing it as a readily available resource for educational institutions.

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Um cálculo da espessura da camada limite

Cited by 2 publications

References 0 publications

Wind-Tunnel Measurement of Differential Pressure on the Surface of a Dynamically Inflatable Wing Cell

Wind-Tunnel Measurement of Differential Pressure on the Surface of a Dynamically Inflatable Wing Cell

Design and development of a low-cost open-type wind tunnel

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