Experimental Study of Aerodynamic Characteristics of a Boxplane Wind-Tunnel Model

Karpovich, E. A.; Kochurova, N.I.; Кузнецов, А. В.

doi:10.3103/s1068799820040133

Cited by 4 publications

(6 citation statements)

References 1 publication

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“…Among the conclusions outlined are sufficient longitudinal static stability (CmCl = −0.07), excessively high zero lift pitching moment (Cm0 = 0.16), high efficiency of rudders and elevators (with aft and fore elevators being non-equally efficient), high lateral instability, and poor flaperon efficiency. Wind tunnel tests of this aircraft model revealed some interesting features of the model [19]. Among the conclusions outlined are sufficient longitudinal static stability (C mCl = −0.07), excessively high zero lift pitching moment (C m0 = 0.16), high efficiency of rudders and elevators (with aft and fore elevators being non-equally efficient), high lateral instability, and poor flaperon efficiency.…”

Section: Geometrymentioning

confidence: 91%

“…Wind tunnel tests of this aircraft model revealed some interesting features of the model [19]. Among the conclusions outlined are sufficient longitudinal static stability (CmCl = −0.07), excessively high zero lift pitching moment (Cm0 = 0.16), high efficiency of rudders and elevators (with aft and fore elevators being non-equally efficient), high lateral instability, and poor flaperon efficiency.…”

Section: Geometrymentioning

confidence: 91%

“…Detailed description of the main geometry of the wind tunnel model can be found in [19], including the following:…”

Section: Geometrymentioning

confidence: 99%

“…The main geometry of the test model is presented in [19]. For flow observations, the model was equipped with fine thin silk tufts glued to its surface.…”

Section: Wind Tunnel Test Conditionsmentioning

confidence: 99%

“…Figure 14.Elevators' efficiency (fore and aft elevators are deflected simultaneously). Data taken from[19].…”

mentioning

confidence: 99%

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Investigation of a Light Boxplane Model Using Tuft Flow Visualization and CFD

Karpovich

Gueraiche

Natalya

et al. 2021

Fluids

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In this paper, we addressed the flow patterns over a light boxplane scale model to explain the previously discovered disagreement between its predicted and experimental aerodynamic characteristics. By tuft flow and CFD visualization, we explored the causes yielding a large zero lift pitching moment coefficient, lateral divergence, difference in fore and aft elevator lift, and poor high lift performance of the aircraft. The investigation revealed that the discrepancy in the pitching moment coefficient and lateral stability derivatives can be attributed to insufficient accuracy of the used predictive methods. The difference in fore and aft elevator lift and poor high lift performance of the aircraft may occur due to the low local Reynolds number, which causes the early flow separation over the elevators and flaperons when deflected downward at angles exceeding 10°. Additionally, some airframe changes are suggested to alleviate the lateral divergence of the model.

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Section: Geometrymentioning

confidence: 91%

Section: Geometrymentioning

confidence: 91%

“…Detailed description of the main geometry of the wind tunnel model can be found in [19], including the following:…”

Section: Geometrymentioning

confidence: 99%

“…The main geometry of the test model is presented in [19]. For flow observations, the model was equipped with fine thin silk tufts glued to its surface.…”

Section: Wind Tunnel Test Conditionsmentioning

confidence: 99%

“…Figure 14.Elevators' efficiency (fore and aft elevators are deflected simultaneously). Data taken from[19].…”

mentioning

confidence: 99%

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Investigation of a Light Boxplane Model Using Tuft Flow Visualization and CFD

Karpovich

Gueraiche

Natalya

et al. 2021

Fluids

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A method for conceptual design of a light boxplane

Karpovich

Gueraiche

Korotkov

2022

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Prediction of Maximum Lift Coefficient of Box-Wing Aircraft through the Combination of an Analytical Adaptation of the DATCOM Method and Vortex-Lattice Simulations

et al. 2022

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The present paper concerns the introduction of a mixed analytical-numerical method for the estimation of the maximum lift coefficient of box-wing aircraft in unflapped configuration. The analytical aspect is related to the adaptation of the method included in the United States Air Force Stability and Control Data Compendium (USAF DATCOM) by means of an approach built on the characteristics of the optimal lift distribution of the box-wing and implemented through simplifying assumptions. Since the formulation depends on parameters proper of the considered aircraft, numerical simulations are performed through a Vortex-Lattice Method to complete the input dataset. The method is first presented and then validated for the case of the 2-seater amphibious PrandtlPlane from the project "IDINTOS", for which wind tunnel data are available. The method is then applied to two test cases for which CFD data are available: a 300 passengers mid-range PrandtlPlane, developed within the European research project "PARSIFAL", and a regional hybrid-electric PrandtlPlane, object of study in the Italian research project "PROSIB". Results are presented and discussed, also analyzing the links between the proposed method and relevant parameters of the box-wing design, such as taper ratios and wing loading repartition among the two wings.

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Experimental Study of Aerodynamic Characteristics of a Boxplane Wind-Tunnel Model

Cited by 4 publications

References 1 publication

Investigation of a Light Boxplane Model Using Tuft Flow Visualization and CFD

Investigation of a Light Boxplane Model Using Tuft Flow Visualization and CFD

A method for conceptual design of a light boxplane

Prediction of Maximum Lift Coefficient of Box-Wing Aircraft through the Combination of an Analytical Adaptation of the DATCOM Method and Vortex-Lattice Simulations

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