Testing of a standard model in the VTI's large-subsonic wind-tunnel facility to establish users' confidence

Ocokoljić, Goran; Damljanović, Dijana; Rašuo, Boško; Isaković, Jovan

doi:10.5937/fmet1403212o

Cited by 14 publications

(12 citation statements)

References 4 publications

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“…Aerodynamic coefficients and differences between coefficients at the model zero angle of attack are given in Table 1. Data in a wind-axes system from the modelupright run were compared with the data at identical aerodynamic angles from the model-inverted run [14] [22][29] to check test section symmetry.…”

Section: Agard-b Test Resultsmentioning

confidence: 99%

“…VTI's T-35 experimental facility ( Figure 1) is a large subsonic wind-tunnel of a continual type with interchangeable, 3.2 m × 4.4 m, octagonal test sections ( Figure 2), [14]. The wind-tunnel, designed by VTI, has been operating since 1964 and has been modernized two times.…”

Section: The T-35 Wind-tunnel Facilitymentioning

confidence: 99%

“…Confidence in the validity of the standard AGARD-B test-data obtained in the T-35 wind-tunnel of VTI was established based on the within-facility and inter-facility comparisons, [14][21] [22]. Two AGARD-B models, with diameters of 115.8 mm and 178 mm, presenting frontal blockages of 0.1% and 0.24%, respectively at zero incidence angle are periodically tested in the T-35 windtunnel.…”

Section: Agard-b Modelsmentioning

confidence: 99%

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Contemporary frame of measurement and assessment of wind-tunnel flow quality in a low-speed facility

Ocokoljić¹,

Damljanović²,

Vuković³

et al. 2018

FME Transactions

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The requirements for the accuracy of measurements in a wind tunnel test become more and more severe while the complexity of the test increases. In an environment of reduced time available for wind tunnel test and increasing test costs, it is important that the accurate calibrations and verifications of all components of the measurement chain in a wind tunnel facility are established, maintained and statistically controlled through prolonged periods of time. The paper presents the efforts undertaken to establish and maintain a system of control of the quality of measurements in the T-35 4.4 m × 3.2 m low-speed wind tunnel of the Military Technical Institute in Belgrade. The assurance of the quality of measurement in this facility is based on ensuring the quality of three main constituents: the calibration of the test section of the wind tunnel, the calibration of the instrumentation used, and the periodic tests of the standard wind tunnel models. Sample results from relevant wind tunnel calibration tests are presented and compared with the results from other facilities. The tests confirmed a good overall quality of the facility, and that the achieved quality level has to be maintained, periodically checked and systematically documented.

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Section: Agard-b Test Resultsmentioning

confidence: 99%

Section: The T-35 Wind-tunnel Facilitymentioning

confidence: 99%

Section: Agard-b Modelsmentioning

confidence: 99%

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Contemporary frame of measurement and assessment of wind-tunnel flow quality in a low-speed facility

Ocokoljić¹,

Damljanović²,

Vuković³

et al. 2018

FME Transactions

Self Cite

View full text Add to dashboard Cite

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“…The tests were conducted in a controlled subsonic wind tunnel supplied with free stream air flow, testing acrylic van model with a 0.25 scale to the original Ahmed body model [2]. The wind tunnel has been calibrated complying manufacturer specification and considering recommendation by several works [29][30][31]. The van models are classified as models without flow control and models with blowing flow control.…”

Section: Methodsmentioning

confidence: 99%

Effect of blowing flow control and front geometry towards the reduction of aerodynamic drag on vehicle models

Tarakka¹,

Salam²,

Jalaluddin³

et al. 2019

FME Transactions

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This paper presents analyses of the effect of blowing flow control and variations on front geometry towards the reduction of aerodynamic drag on vehicle models. Blowing flow control is an alternative measure in modifying the onset of flow separation in the boundary layer on the surface of the vehicle. The modification is expected to reduce the dominating influence of the separation area on the total drag. Conducted in computational and experimental approaches, the research investigated the effect of frontal slant angle variations (θ) of 25°, 30° and 35° towards the reduction of aerodynamic drag on vehicle models on the application of blowing flow control with upstream and blowing speed of 16.7 m/s and 0.5 m/s, respectively. Load cells were used in the experimental method to validate the reduction of aerodynamic drag obtained from computational method. It is indicated that the effects of blowing flow control and variations on front geometry are significant in the increasing on pressure coefficients and the reduction of aerodynamic drag on vehicle models. The largest increase on pressure coefficients of 38.93% is indicated on the vehicle model with θ=35°, while the largest reduction of aerodynamic drag occurred on the same model with the values of 14.81 and 12.54 for computational and experimental methods, respectively.

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“…With the development of the aerospace industry, there is more and more demand for high subsonic aircraft, and its aerodynamic test problem attracts more and more attention. The aircraft is prone to dynamic instability in a high subsonic state [1]. Therefore, it is necessary to further study the aerodynamic characteristics of the atmospheric reentry module of the spacecraft in a high subsonic state through a high subsonic wind tunnel test [2,3].…”

Section: Introductionmentioning

confidence: 99%

Numerical Computation and Analysis of Electromagnetic Field in Magnetic Suspension and Balance System

Zhai¹,

Xia²,

Li³

et al. 2021

Magnetochemistry

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The magnetic suspension wind tunnel balance (MSBS) is an entirely new device for aerodynamic measurement, and it makes the best of the electromagnetic force to suspend the aircraft model in the wind tunnel without contact. Compared with conventional wind tunnel balance, it absolutely abandons the model support and airflow interference. Therefore, the aerodynamic measurement environment is more authentic and the aerodynamic measurement results are more accurate. The electromagnetic field in MSBS plays a major role in bearing the force of wind. The numerical computation and finite element numerical analysis are performed to investigate key factors of electromagnetic force under different conditions. The calculation results based on finite element method (FEM) have revealed that the diameter and the spacing of of the axial coil, the number of segments and the pitch angle of the suspension model are key factors of electromagnetic force. Based on the above key factors, the structure of the magnetic suspension balance is optimized to maximize the electromagnetic force under multiple constraints.

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Testing of a standard model in the VTI's large-subsonic wind-tunnel facility to establish users' confidence

Cited by 14 publications

References 4 publications

Contemporary frame of measurement and assessment of wind-tunnel flow quality in a low-speed facility

Contemporary frame of measurement and assessment of wind-tunnel flow quality in a low-speed facility

Effect of blowing flow control and front geometry towards the reduction of aerodynamic drag on vehicle models

Numerical Computation and Analysis of Electromagnetic Field in Magnetic Suspension and Balance System

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