TY - GEN
T1 - Development and validation of physics based models for ice shedding
AU - Gupta, Avani
AU - Halloran, Elizabeth
AU - Sankar, Lakshmi N.
AU - Palacios, Jose
AU - Kreeger, Richard E.
PY - 2018/1/1
Y1 - 2018/1/1
N2 - Calculations for ice accretion and shedding are presented for a model scale rotor in hover. The aerodynamic characteristics of the rotor are first computed using a combined blade element-momentum theory. The effective angles of attack, and the local flow velocity are used within the NASA Glenn solver LEWICE to estimate the collection efficiency. The computed collection efficiency and the surface pressure distribution from a panel method within LEWICE are used to estimate the ice accretion over the rotor blades for a selected time interval. Finally, a force balance approach is used to establish shedding events where the centrifugal force over the ice mass exceeds the adhesive forces at the rotor surface and the cohesive forces between adjacent masses of ice. Preliminary comparisons with test data acquired at the Pennsylvania State Icing Research Tunnel are presented. Sensitivity of the ice shedding events to surface roughness, adhesive strength, cohesive strength, and ambient conditions is discussed.
AB - Calculations for ice accretion and shedding are presented for a model scale rotor in hover. The aerodynamic characteristics of the rotor are first computed using a combined blade element-momentum theory. The effective angles of attack, and the local flow velocity are used within the NASA Glenn solver LEWICE to estimate the collection efficiency. The computed collection efficiency and the surface pressure distribution from a panel method within LEWICE are used to estimate the ice accretion over the rotor blades for a selected time interval. Finally, a force balance approach is used to establish shedding events where the centrifugal force over the ice mass exceeds the adhesive forces at the rotor surface and the cohesive forces between adjacent masses of ice. Preliminary comparisons with test data acquired at the Pennsylvania State Icing Research Tunnel are presented. Sensitivity of the ice shedding events to surface roughness, adhesive strength, cohesive strength, and ambient conditions is discussed.
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M3 - Conference contribution
T3 - 44th European Rotorcraft Forum 2018, ERF 2018
SP - 1020
EP - 1028
BT - 44th European Rotorcraft Forum 2018, ERF 2018
PB - Netherlands Association of Aeronautical Engineers
T2 - 44th European Rotorcraft Forum 2018, ERF 2018
Y2 - 18 September 2018 through 21 September 2018
ER -