The adverse effects of ice formation on the aerodynamic characteristics of wings and helicopter blades are well known. It is known that icing may cause premature flow separation and lead to stall at angles of attack as low as 6 degrees. Techniques for quantitative prediction of the 3D leading edge ice formation process and the effects of icing on the aerodynamic performance of wings and rotors are however not well developed. Reliable techniques for quantitative prediction of the above phenomena are urgently needed, so that next generation aircraft and rotor craft may be designed to cope with icing. Additionally, experimental iced wing flow field data is required for code validation efforts.
Hello Dear Ahmed.
In aerospace and aircraft design. avoidance of flow separation or flow stall due to icing phenomena can be divided in folowwing methods:
* Interdict icing: By heating (leading edge and forward extrados heated by internal heat flow from exhaust gas of motor or little hot flow from turbojet compressor). Add microwaves absorbed by ice.Electric parietal heating .
Special anti-adesive coating film.
* Destroy ice accumulation by ultrasonic waves or fracture separation by repated pulsed mechanical or pneumatic, hydro-pneumatic choc-waves : strain incompatibility separation between wing or airframe material and formed ice.
* Inertial forces. ( case of rotative cmponents turbojet nose shaft, rotors or blades).
Adequate mixing of these methods gives an efficient solutions to avoid icing.
Best regards.
Naceur Selmi.
Dear/ Naceur Selmi
Thanks but my question aims to use ice forming with determined thickness in reducing or eliminating flow separation I mean that using specific ice thickness as a vortex generator on the wing of air craft . However, how do we calculate the ice thickness? may using CFD (simulation) or design optimization.
Regards
In Russian aviation there is such a device that measures the thickness of the ice using radioactive radiation. But the best way to solve this problem is to install the vibrator in the appropriate places.
Ahmed Abdelhameed
Maybe it could be better to change the title of your question.
And also reading some reports of lab.s and organizations on wind tunnel icing could help. e.g.
https://www.airtn.eu/wp-content/uploads/07-2016-06-03_CIRA-DASSAULT.pdf
Look for patent, please.http://www.findpatent.ru/patent/239/2393976.html
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