甲板上におけるヘリコプタロータまわりの流れ場のCFD解析

摘要

To land a helicopter on a flight deck of a ship is said to be one of difficult operations even for experienced pilots because the helicopter rotor is affected by complex flows, e.g. ship airwakes and interference flows formed between the rotor and superstructures, in addition to ship motions. Therefore, it is important to grasp quantitatively influence of these complex flows on the helicopter rotor for securing the safe deck-landing. In this paper, CFD analysis of helicopter rotor operating over a flight deck is done by solving unsteady 3D compressible Euler equations with an overlapped grid system. The superstructure on a flight deck is modeled by a simple sharp edged bluff body. Parameters for numerical analysis are landing spot and relative wind speed to the rotor and ship. Effects of these parameters on the rotor torque, flowfields around the rotor and inflow distributions on the rotor disc are clarified.%ヘリコプタによる航行中の艦艇への着艦は,艦艇が動揺していることに加え，艦艇後流として知られる艦艇構造物からの剝がれた流れやロータ後流と艦艇構造物との干渉で生じる流れが混在する複雑な流れ場において行われるため.熟練したパイロットでさえ非常に困難な,また.潜在的な危険性を含んだオペレーションの1つであるといわれている.