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LWC and Temperature Effects on Ice Accretion Formation on Swept Wings at Glaze Ice Conditions
| Content Provider | Semantic Scholar |
|---|---|
| Author | Vargas, Mario Reshotko, Eli |
| Copyright Year | 2000 |
| Abstract | An experiment was conducted to study the effect of liquid water content and temperature on the critical distance in ice accretion formation on swept wings at glaze ice conditions. The critical distance is defined as the distance from the attachment line to the beginning of the zone where roughness elements develop into glaze ice feathers. A baseline case of 150 mph, 25 °F, 0.75 g/m 3 LWC and 20 i_m MVD was chosen. Icing runs were performed on a NACA 0012 swept wing tip at 150 mph and MVD of 20 i_m for liquid water contents of 0.5 g/m 3, 0.75 g/m 3, and 1.0 g/m 3, and for total temperatures of 20 °F, 25 °F and 30 °F. At each tunnel condition, the sweep angle was changed from 0° to 45 ° in 5° increments. Casting data, ice shape tracings, and close-up photographic data were obtained. The results showed that decreasing the LWC to 0.5 g/m 3 decreases the value of the critical distance at a given sweep angle compared to the baseline case, and starts the formation of complete scallops a_t 30° sweep angle. Increasing the LWC to 1.0 g/m 3 increases the value of the critical distance compared to the baseline case, the critical distance remains always above 0 millimeters and complete scallops are not formed. Decreasing the total temperature to 20 °F decreases the critical distance with respect to the baseline case and formation of complete scallops begins at 25° sweep angle. When the total temperature is t AerospaceEngineer, Icing Branch, NASA Glenn Research Center, Member AIAA t Professor,Departmentof Mechanicaland Aerospace Engineering, FellowAIAA Copyright © 2000bytheAmericanInstituteof Aeronauticsand Astronautics, Inc. Nocopyright is assertedintheUnitedStates underTitle17, U.S,Code.The U.S,Government hasa royaltyfree licenseto exerciseall rightsunderthe copyright claimed hereinforGovemmental Purposes, Allotherrightsarereserved bythecopyright owner, increased to 30 °F, bumps covered with roughness elements appear on the ice accretion at 25° and 300 sweep angles, large ice structures appear at 35° and 40° sweep angles, and complete scallops are formed at 45° sweep angle. |
| File Format | PDF HTM / HTML |
| DOI | 10.2514/6.2000-483 |
| Alternate Webpage(s) | https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20000025583.pdf |
| Alternate Webpage(s) | http://wayback.archive-it.org/1792/20100213032638/http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20000025583_2000025350.pdf |
| Alternate Webpage(s) | https://permanent.access.gpo.gov/websites/ntrs.nasa.gov/pdf-archive/20000025583.pdf |
| Alternate Webpage(s) | https://doi.org/10.2514/6.2000-483 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
