Development of a nonrecirculating wind-tunnel configuration insensitive to external winds
| Autor: | C. R. Leef, R. G. Hendry |
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| Rok vydání: | 1969 |
| Předmět: | |
| Zdroj: | Journal of Aircraft. 6:221-227 |
| ISSN: | 1533-3868 0021-8669 |
| Popis: | The extreme size of facilities required for aerodynamics testing of V/STOL vehicles has prompted an investigation of a wind-tunnel configuration other than the conventional closed-return type. Because the open-return type selected is vulnerable to atmospheric wind effects, an extensive experimental program to minimize wind disturbances has been run on scale models. One ^4-scale model and two -^-scale models were used to study test section flow distribution and speed changes due to winds from various directions. A complete •§*j--scale configuration was immersed in the flow of a large wind tunnel simulating winds up to 30 mph. Results are presented for variations of tunnel components, test section airspeed, wind speed and direction, and presence of nearby buildings. Wind effects cannot be sufficiently attenuated by inlet shape modifications or addition of screens and honeycomb. Complete enclosure of the inlet in a protective housing, combined with a vertical cylindrical exhaust stack, will reduce wind disturbances to a satisfactory level. For configurations developed in this investigation, test-section disturbances have been held within rbl% of dynamic pressures as low as 2 psf with a 20-mph wind blowing from any direction. |
| Databáze: | OpenAIRE |
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