Design of airplane wing anti-icing fluid tests in wind tunnel

• Main Author: Rinne, Antti Alpo
• Other Authors: Kivekäs, Juha, Insinööritieteiden korkeakoulu, School of Engineering, Sovelletun mekaniikan laitos, Siikonen, Timo, Aalto-yliopisto, Aalto University
• Format: Master Thesis
• Language: English
• Published: 2013
• Subjects: de-icing; anti-icing; effect on takeoff performance; jäänpoisto; jäänesto; vaikutus lentoonlähtösuoritusarvoihin; Arctic; Arktis*
• Online Access: https://aaltodoc.aalto.fi/handle/123456789/100981

Three wind tunnel test set-ups for the research of the effects of de-and anti-icing fluids on transport airplane take-off performance at arctic conditions are designed. Implementation of the set-ups and performing the tests in the Aalto University subsonic wind tunnel are described. Processing of the results is instructed and a method is developed for determining the average thickness of a fluid layer on a wind tunnel model surface from pictures of the layer. In the first test set-up an existing wind tunnel model is utilised to study the fluid flow-off mechanism. A video is shot of the test and the average fluid thickness is determined from the screen captures. For the second set-up a flat plate elimination test (FPET) duct is designed on the basis of SAE Aerospace Standard AS5900. The dimensions are enlarged to ensure operation in a wind tunnel with a larger test section than for which the standard was developed. In this test the boundary layer displacement thickness on the duct floor is measured. In the third set-up a wing profile model representative of a modern transport airplane wing and equipped with adjustable lift-enhancing devices is used. Take-off run and rotation of a transport airplane are simulated and the lift coefficient is measured in this test. Test runs with the set-ups are performed and the results are processed. The results obtained with the fluid thickness determination method are observed to be reasonable. Also the flat plate elimination test results are observed to be comparable to the published results from AS5900 compliant tests. Tässä työssä suunnitellaan ja toteutetaan kolme koejärjestelyä lentokoneen jäänpoisto- ja jäänestonesteiden tuulitunnelikokeita varten. Koejärjestelyjen avulla voidaan tutkia nesteiden vaikutusta matkustajalentokoneen lentoonlähtösuoritusarvoihin arktisissa olosuhteissa. Työssä kuvataan koejärjestelyjen rakentaminen ja kokeiden suorittaminen Aalto-yliopiston alisoonisessa tuulitunnelissa. Lisäksi annetaan ohjeet tulostenkäsittelystä ja esitetään menetelmä, ...