Modeling of selected phenomena governing surface icing

• Autorzy: Sznajder J.
• Języki publikacji: EN

Abstrakty

EN

Atmospheric icing poses a threat for safety in many areas of transport, especially in air transport and exerts harmful impact on operation of external sensors and mechanisms of aircraft, ships and land vehicles. In order to investigate phenomena leading to ice accretion on sensitive parts of objects exposed to icing conditions numerical simulation models are in use. These models are typically composed of submodels dealing with a fragment of the complex phenomenon of ice accretion and its interaction with external flow. A practical approach to simulation of icing process is to divide it into three problems being solved interactively: 1) simulation of two-phase flow of air and dispersed supercooled water and determination of distribution of mass of water hitting the object’s surface, 2) determination of conditions on the surface collecting supercooled water from the external flow and simulation of freezing and water film flow, and 3) modification of computational grid as a consequence of change of shape of the surface with deposits of ice. A simulation system directed at investigation of atmospheric icing on moving object is being developed as an extension of capabilities of a commercial CFD code ANSYS FLUENT. Solutions of two-phase flow of air and dispersed water with specific boundary conditions enabling the determination of distribution of water hitting the surface, as well as results of modelling of water film flow on the surface will be presented. The system of equations describing the transport of the dispersed water consists of the continuity and momentum equations. It is assumed, that interactions between the phases are onedirectional, i.e. the air flow influences the water droplet flow and not vice-versa. It is also assumed that the water film velocity distribution is linear in direction normal to surface. This way, both phenomena are being described with first order partial differential equations with respect to space and time and the solution approaches may be similar.

Słowa kluczowe

EN

icing; transport; air transport; simulation; two-phase flow

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2013
• Tom: Vol. 20, No. 2
• Strony: 377--384
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Sznajder J.

• Institute of Aviation Department of Aerodynamics and Flight Mechanics Krakowska Av. 110/114, 02-256 Warsaw, Poland tel.: [phone] ext 492, fax: [phone]

Bibliografia

• [1] Beaugendre, H., Morency, F., Habashi, W. G., FESNSAP-ICE’s Three-Dimensional In-Flight Ice Accretion Module: ICE3D, Journal of Aircraft, Vol. 40, No. 2, 2003.
• [2] Federal Aviation Regulations FAR 25 Appendix C, hhttp://www.flightsimaviation.com/data/ FARS/part_25-appC.html.
• [3] Hospers, J. M., Hoeijmakers, H. W. M., Eulerian Method for Ice Accretion on Multiple-Element Airfoils, 7-th International Conference on Multiphase Flows, Tampa, FL, United States 2010.
• [4] Morrison, F. A., Data Correlation for Drag Coefficient for Sphere, www.chem.mtu.edu/~fmorriso/DataCorrelationForSphereDrag2010.pdf, Department of Chemical Engineering, Michigan Technological University, Houghton, MI, accessed October 2011.
• [5] Papadakis, M, Rachman, A, Wong, S.-C., Yeong, H.-W., Hung, K. E, Vu, G. T., Bidwell, C. S., Water Droplet Impingement on Simulated Glaze, Mixed and Rime Ice Accretions, Technical Report NASA/TM-2007-213961, NASA, 2007.
• [6] Potapczuk, M. G., Al-Khalil, K. M., Velazquez, M. T., Ice Accretion and Performance Degradation Calculations with LEWICE/NS, NASA Technical Memorandum 105972, AIAA- 93-0173, Prepared for the 31st Aerospace Sciences Meeting and Exhibit, Reno, Nevada, United States 1993.
• [7] Szilder, K., Lozowski, E., Numerical Simulation of Cloud Drop Inpingement on a Helicopter, 27-th Congress of the Aeronautical Sciences, ICAS, 2010.
• [8] Morency, F., Tezok, F., Paraschivoiu, I., Heat and Mass Transfer in the Case of Anti-Icing System Simulation, Journal of Aircraft, Vol. 37. No. 2, 2000.