Optimum porosity for an inclined-hole transonic test section wall treated for edgetone noise reduction

Elfstrom, Gary; Medved, B.; Rainbird, W. J.

doi:10.2514/6.1988-2003

Cited by 1 publication

(3 citation statements)

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“…This article provides general information about T-38 and T-35 facilities. More detailed descriptions of their technical characteristics, measuring techniques used and principles of operation is given in [42][43][44].…”

Section: Test Facilitiesmentioning

confidence: 99%

“…In recent years, a number of upgrades have been made to the facility, including the replacement of many sensors with modern, more reliable and more accurate ones, the replacement of the wind tunnel control system and the replacement of the data acquisition system. A solid-wall test section is used in subsonic and supersonic tests, while a test section with perforated porous walls [43] is added to the wind tunnel configuration in transonic tests. The porosity of walls of the transonic test section is varied between 1.5% and 4%, depending on the Mach number, to achieve the best flow quality and minimize wall interference.…”

Section: The Vti T-38 Wind Tunnelmentioning

confidence: 99%

“…Stagnation pressure in the test section of the wind tunnel can be between 1.1 and 15 bar, the operating envelope depending on Mach number, and resulting in Reynolds numbers of up to 110 million per meter. Stagnation pressure is regulated to within 0.1% of the A solid-wall test section is used in subsonic and supersonic tests, while a test section with perforated porous walls [43] is added to the wind tunnel configuration in transonic tests. The porosity of walls of the transonic test section is varied between 1.5% and 4%, depending on the Mach number, to achieve the best flow quality and minimize wall interference.…”

Section: The Vti T-38 Wind Tunnelmentioning

confidence: 99%

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Wind Tunnel Testing of ONERA-M, AGARD-B and HB-2 Standard Models at Off-Design Conditions

et al. 2021

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Published results for standard wind tunnel models at non-standard test conditions are quite rare and/or may not be available. It has been found that those results are a useful aid in preparations for a number of wind tunnel tests in the Military Technical Institute (VTI) in Belgrade. Test campaigns of standard models at non-standard conditions are performed to serve as an internal database for future wind tunnel tests in such environments. Those tests, that partially overlap the referenced Mach number and/or angle of attack ranges, are conducted in different VTI’s test facilities; different model sizes and support stings were used. The standard models used in static measurements in VTI, ranging from simple missile shapes and re-entry bodies to complicated airplanes, are briefly described and sample non-standard test results are given. The correlation of the test results among models and facilities has been done with references in the available ranges, and, after confirming a good agreement, it is assumed that the results are also valid in the extended ranges of conditions. These results may be useful for researchers in other wind tunnel facilities and for those who handle CFD tools.

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Section: Test Facilitiesmentioning

confidence: 99%

Section: The Vti T-38 Wind Tunnelmentioning

confidence: 99%

Section: The Vti T-38 Wind Tunnelmentioning

confidence: 99%

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