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<p>The AGARD-B standard model was tested for the first time in the Shiraz University (Aseef) Transonic Wind Tunnel (ATWT) to evaluate measurement accuracy and repeatability. Forces and moments were recorded using a six-component internal balance over a range of angles of attack (up to 15°) and Mach numbers from 0.3 to 0.95. The aerodynamic characteristics obtained in this study were compared with those from the 4&#xa0;T Aerodynamic Wind Tunnel (AEDC) and the CSIR Wind Tunnel, revealing a deviation in lift coefficient of less than 0.5% at angles of attack below 13°, before vortex breakdown, and up to 5% at angles exceeding 13°, after vortex breakdown. These results validate the accuracy of the measurements taken at the ATWT. Wind tunnel blockage, measured at 0.2% in ATWT, was found to have a negligible impact on aerodynamic characteristics of AGARD-B model. Additionally, variations in Reynolds number revealed that higher Reynolds numbers delayed vortex breakdown, postponing the onset of lift loss and pitch-up. The root mean square of deviations for aerodynamic force and moment measurements showed repeatability errors of less than 0.0003 for the drag coefficient, better than 0.01 for the lift coefficient, and approximately 0.001 for the pitching moment coefficient. The flow quality evaluation showed that the Mach number deviation was within the range associated with good flow quality in subsonic and transonic wind tunnels. Furthermore, flow angularity was consistently below 0.2° across all tested Mach numbers, further affirming the precision of the ATWT facility. </p>

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Data Quality Assessment of a Transonic Wind Tunnel Based on Testing of an AGARD-B Standard Model

  • 期刊论文

  • 发表日期：

    2025年5月30日

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  • Arash Alipoor,
  • Mohammad Mehdi Alishahi,
  • Mohammad Hossein Montazeri

摘要

The AGARD-B standard model was tested for the first time in the Shiraz University (Aseef) Transonic Wind Tunnel (ATWT) to evaluate measurement accuracy and repeatability. Forces and moments were recorded using a six-component internal balance over a range of angles of attack (up to 15°) and Mach numbers from 0.3 to 0.95. The aerodynamic characteristics obtained in this study were compared with those from the 4 T Aerodynamic Wind Tunnel (AEDC) and the CSIR Wind Tunnel, revealing a deviation in lift coefficient of less than 0.5% at angles of attack below 13°, before vortex breakdown, and up to 5% at angles exceeding 13°, after vortex breakdown. These results validate the accuracy of the measurements taken at the ATWT. Wind tunnel blockage, measured at 0.2% in ATWT, was found to have a negligible impact on aerodynamic characteristics of AGARD-B model. Additionally, variations in Reynolds number revealed that higher Reynolds numbers delayed vortex breakdown, postponing the onset of lift loss and pitch-up. The root mean square of deviations for aerodynamic force and moment measurements showed repeatability errors of less than 0.0003 for the drag coefficient, better than 0.01 for the lift coefficient, and approximately 0.001 for the pitching moment coefficient. The flow quality evaluation showed that the Mach number deviation was within the range associated with good flow quality in subsonic and transonic wind tunnels. Furthermore, flow angularity was consistently below 0.2° across all tested Mach numbers, further affirming the precision of the ATWT facility.