The Design, Fabrication, and Evaluation of a Low-Speed, Low-Turbulence, Anechoic Wind Tunnel
| العنوان: | The Design, Fabrication, and Evaluation of a Low-Speed, Low-Turbulence, Anechoic Wind Tunnel |
|---|---|
| المؤلفون: | Kaplan, Brian J. |
| تفاصيل مُضافة: | Patrick, H.V.L. advisor Embry-Riddle Aeronautical University. Department of Aerospace Engineering. H. V. L. Patrick James Ladesic Charles Eastlake Kaplan, Brian J. |
| Call Numbers: | TL567.W5 K37 1996eb |
| وصف مادي: | 1 online resource (xiii, 95 [i.e. 94] leaves) : illustrations |
| مستخلص: | In order to provide a means for testing noise reduction techniques in propellers and fans, a low-speed, low-turbulence, anechoic wind tunnel was designed, fabricated and evaluated at Embry-Riddle Aeronautical University. This open circuit wind tunnel was designed using several other existing wind tunnels as a guide and incorporated an open jet test section. The tunnel, which was built almost entirely out of wood and fiberglass, is powered by a 15 hp centrifugal fan. Tufts of yarn, a pitot-static tube, and a hot film anemoter were used to determine the flow characteristics in the test section of this wind tunnel. From the hot film anemometer, values of velocity, standard deviation and turbulence intensity were determined for three different velocity settings; approximately 114 ft/s, 145 ft/s, and 215 ft/s respectively. For the 215 ft/s and 114 ft/s tests, the turbulence intensity ranged from 0.42% to 0.87% within a seven inch diameter about the centerline. This seven inch diameter was mapped out to simulate a seven inch diameter propeller. For the 145 ft/s test, the turbulence intensity became more erratic, and ranged between 0.67% and 1.5%. The velocity across the test section for all three tests varied by less than 2.0%, with 90% of the points varying by less than 1.0%. |
| الموضوعات: | Wind tunnels Design and construction., Wind tunnels Evaluation., Anechoic chambers., Noise control., Souffleries aérodynamiques Évaluation., Chambres sourdes., Bruit Lutte contre., anechoic rooms., noise control., Anechoic chambers, Noise control, Wind tunnels Design and construction |
| مصطلحات الفهرس: | Aerospace Engineering, Propulsion and Power |
| URL: | |
| الإتاحة: | Open access content. Open access content |
| ملاحظة: | Also available in print. "Daytona Beach, Florida, Spring 1996." Includes bibliographical references (leaves 89-90). Acknowledgements ; Abstract ; List of tables ; Lift of figures ; Nomenclature -- 1. Introduction. Identification of problem ; Previous research -- 2. Background and theory. Wind tunnel layout ; Effects of honeycomb on free-stream turbulence ; Turbulence reduction through a contraction ; Jet mixing regions ; Pressure drop through the tunnel -- 3. Tunnel design and construction. Turbulence management section. Screens ; Honeycomb ; Contraction ; Test section ; Collector ; Anechoic test chamber ; Diffuser ; Plenum chamber ; Fan and motor assembly ; Support frames and final assembly -- 4. Experimentation. Visualization ; Hot film anemometer ; Probe calibration ; Data acquisition -- 5. Results. Visualization and design changes ; High speed results ; High pass filter ; Half speed results ; Low speed results -- 6. Conclusions. Visualization. Diffuser ; Collector ; Contraction ; Velocity analysis. Mean velocity ; Turbulence intensity -- 7. Recommendations. Existing tunnel improvements. Diffuser modifications ; Acoustic treatment ; Full scale modifications. Screens ; Assembly procedure ; Collector ; Diffuser ; Plenum chamber -- References -- Appendix. A. Velocity tables. |
| أرقام أخرى: | FER oai:commons.erau.edu:db-theses-1133 1014343440 |
| المصدر المساهم: | From OAIster®, provided by the OCLC Cooperative. |
| رقم الأكسشن: | edsoai.on1014343440 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |