直升机/舰船耦合流场的数值模拟

doi:10.7527/S1000-6893.2017.120853

Abstract

Abstract:

A computational method based on Reynolds-Averaged Navier-Stokes (RANS) equations is developed for the study of aerodynamic interaction between helicopter and ship, wherein ROE-MUSCL scheme is used to reconstruct the flux at the interface, and k-ε turbulence model is used to improve the simulation precision for flow structure. Actuator disk method is used to simulate the main rotor and tail. A scaled LPD-17 ship and ROBIN helicopter are then used to simulate the coupled flow field. The coupled flow field characteristics are analyzed, inlucing vorticity, velocity and pressure fields. Analysis results indicate that when the freestream velocity is greater than 4 m/s, Reynolds number of ship flowfield comes into the prospective area of Reynolds number the normalized velocity components of the ship flow field remain unchanged; during the landing process, the main rotor will interact with the large recirculation zone and the deck-edge vortices, and these interactions as well as ground effect cause the rotor thrust to oscillate, and the oscillation shows a regularity of increase first and then decrease. When the landing spot moves to the stern, the effect of the recirculation zone diminishes, thus causing reduction of the amplitude of thrust oscillation. Simulation of the interaction between full aircraft and ship is conducted. Results show that fuselage and tail have slightly influence on the characteristics of the main flow field; therefore, the coupled flow field of rotor/ship can be used to analyze the safety during shipborne operations, and the computation time can thus be shortened significantly.

Key words: helicopter, ship, ship airwake, actuator disk method, shipborne operation

CLC Number:

V211.52
O351

SU Dacheng, SHI Yongjie, XU Guohua, ZONG Kun. Numerical simulatin of coupled flow field of helicopter/ship[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(7): 520853-520853.

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Numerical simulatin of coupled flow field of helicopter/ship

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