Effect of diamond shaped strut with cylindrical pitch rod in subsonic wind tunnel testing

Haque, A.; Asrar, Waqar; Omar, Ashraf Ali; Sulaeman, Erwin

doi:10.1016/j.measurement.2016.12.016

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…Flow interference and contamination of downstream components however, can be a significant source of uncertainty. 17,18 Page et al 9 has reported changes in pressure coefficient of up to ΔCp = −0.1 on the model roof directly ahead and behind of a top strut, reflective of the localised junction flow forcing an upstream and downstream roof separation. Additional changes have been noted by Strachan et al 14 on an Ahmed body (25° backlight angle) with a significant velocity deficit (u* ≈ 0.95) extending up to one model length downstream of the model base, with Strachan et al 11 also showing the wake of the top strut to increase the surface pressure in the backlight region, resulting in the generation of weaker (C-pillar) corner vortices and premature bursting of the separation bubble.…”

Section: Introductionmentioning

confidence: 98%

Upstream wind tunnel model mounting: The forgotten method for road vehicle aerodynamics

Rejniak

Gatto

2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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A new method for supporting ground vehicle wind tunnel models is proposed. The technique employs a centrally mounted sting connecting the front face of the vehicle, adjacent to the floor, to a fixed point further upstream. Experiments were conducted on a 1/24th-scale model, representative of a Heavy Goods Vehicle, at a width-based Reynolds number of 2.3 × 105, with detailed comparisons made to more established support methodologies. Changes to mean drag coefficients, base pressures and wake velocities are all evaluated and assessed from both time-independent and time-dependent perspectives, with a particular focus within the wake region. Results show subtle changes in drag coefficient, together with discrete modifications to the flow-field, dependent on the method adopted. Subtle differences in base pressures and wake formation are also identified, with mounting the model upstream found to demonstrate retention of many of the beneficial effects of other techniques without suffering their deficiencies. Overall, these results identify the upstream mounting methodology as a viable alternative to currently available and more well-established techniques used to facilitate wind tunnel aerodynamic interrogation.

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Section: Introductionmentioning

confidence: 98%

Upstream wind tunnel model mounting: The forgotten method for road vehicle aerodynamics

Rejniak

Gatto

2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The traditional rigid support mode, due to the support frame, causes distortion of the flow around the model, which makes the model test results different from the aerodynamic characteristics of the real aircraft. [1][2][3] To improve the data accuracy of the wind tunnel test, the development of new support system is one of the urgent problems to be solved. Significant efforts, such as data correction procedures 4,5 and magnetic suspension and balance system (MSBS), 6 are developed to minimize or eliminate the shortcomings of model mounts.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wire-driven parallel robot suspension system for SDM in a low-speed wind tunnel

Peng

Lin

et al. 2023

Advances in Mechanical Engineering

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A wire-driven parallel robot with eight wires (WDPR-8) acting as the suspension system for an aircraft model in a low-speed wind tunnel is introduced in this paper. A kinematics model for WDPR-8 is established here. A theoretical basis is also provided, through which movement control of the model is achieved by changing the wire length. A model motion control subsystem, a monocular vision measurement subsystem for the model position, and a data acquisition subsystem were also developed for WDPR-8. A prototype of WDPR-8 was built and mounted in a low-speed wind tunnel with an open test section. A six-component strain-gauge balance was installed inside the test model to acquire aerodynamic parameters. The aerodynamic coefficients of the static test show reasonable agreement with reference results. The difference between the test result of WDPR-8 and the results from reference is smaller in the positive angle of attack than the negative angle of attack, and the total difference between WDPR-8 and other facilities is under 10%. Pitch dynamic tests with different amplitudes and frequencies were used to verify the aerodynamic hysteresis phenomena. The research indicates it is successful that the solution of measuring aerodynamic parameters with strain-gauge balance set into the standard dynamic model suspended by WDPR. It demonstrates that WDPR-8 is effective and feasible as a model suspension system in a low-speed wind tunnel. Furthermore, test results without interference correction in accordance with the reference data proves that the interference of Wire-Driven support system to flow field during wind tunnel tests is negligible. Finally, WDPR suspension system introduced in this paper will remarkably improve the efficiency and accuracy in wind tunnel test.

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Development of a cable suspension and balance system and its novel calibration methods for effective wind tunnel tests

2021

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Effect of diamond shaped strut with cylindrical pitch rod in subsonic wind tunnel testing

Cited by 3 publications

References 20 publications

Upstream wind tunnel model mounting: The forgotten method for road vehicle aerodynamics

Upstream wind tunnel model mounting: The forgotten method for road vehicle aerodynamics

Wire-driven parallel robot suspension system for SDM in a low-speed wind tunnel

Development of a cable suspension and balance system and its novel calibration methods for effective wind tunnel tests

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