ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Numerical simulatin of coupled flow field of helicopter/ship
Received date: 2016-10-13
Revised date: 2016-11-05
Online published: 2017-03-09
Supported by
National Key Laboratory Foundation of Science and Technology on Rotorcraft Aeromechanics (6142220010301)
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
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 . DOI: 10.7527/S1000-6893.2017.120853
[1] REDDY K R, TOFFOLETTO R, JONES K R W. Numerical simulation of ship airwake[J]. Computers & Fluids, 2000, 29(4): 451-465.
[2] ZHANG F, XU H, BALL N G. Numerical simulation of unsteady flow over SFS2 ship model[C]//Proceedings of the 47th AIAA Aerospace Sciences Meeting and Including the New Horizons Forum and Aerospace Exposition. Reston: AIAA, 2009.
[3] POLSKY S A. A computational study of unsteady ship airwake[C]//Proceedings of the 40th AIAA Aerospace Sciences Meeting and Exhibit. Reston: AIAA, 2002.
[4] 郜冶, 刘长猛. 护卫舰气流场数值计算研究[J]. 哈尔滨工程大学学报, 2013, 34(5): 599-603. GAO Y, LIU C M. Numerical calculation of frigate ship airwake[J]. Journal of Harbin Engineering University, 2013, 34(5): 599-603 (in Chinese).
[5] 黄斌, 徐国华, 史勇杰. 机库门开合对舰载直升机着舰域流场的影响研究[J]. 南京航空航天大学学报, 2015, 47(2): 198-204. HUANG B, XU G H, SHI Y J. Research on influence of hangar door opening and closing on landing flowfield for shipborne helicopters[J]. Journal of Nanjing University of Aeronautics & Astronautics, 2015, 47(2): 198-204 (in Chinese).
[6] BRIDGES D O, HORN J F, ALPMAN E, et al. Coupled flight dynamics and CFD analysis of pilot workload in ship airwakes[C]//Proceedings of the AIAA Atmospheric Flight Mechanics Conference and Exhibit. Reston: AIAA, 2007.
[7] YANG A M, YANG X Q. Multigrid acceleration and chimera technique for viscous flow past a hovering rotor[J]. Journal of Aircraft, 2011, 48(2): 713-715.
[8] YANG G W, ZHUANG L X. Numerical simulation of rotor flow in hover[J]. Journal of Aircraft, 2000, 37(2): 221-226.
[9] 许和勇, 叶正寅. 悬停共轴双旋翼干扰流动数值模拟[J]. 航空动力学报, 2011, 26(2): 453-457. XU H Y, YE Z Y. Numerical simulation of interaction unsteady flows around co-axial rotors in hover[J]. Journal of Aerospace Power, 2011, 26(2): 453-457 (in Chinese).
[10] 樊枫, 徐国华, 史勇杰. 基于CFD方法的直升机旋翼/尾桨非定常气动干扰计算[J]. 航空动力学报, 2014, 29(11): 2633-2642. FAN F, XU G H, SHI Y J. Calculations of unsteady aerodynamic interaction between main-rotor and tail-rotor of helicopters based on CFD method[J]. Journal of Aerospace Power, 2014, 29(11): 2633-2642 (in Chinese).
[11] LEE Y, SILVA M. CFD modeling of rotor flowfield aboard ship[C]//Proceedings of the 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition. Reston: AIAA, 2010.
[12] MEAKIN R L. A new method for establishing intergrid communication among systems of overset grids: AIAA-1991-1586-CP[R]. Reston: AIAA, 1991.
[13] CROZON C, STEIJL R, BARAKOS G N. Numerical study of helicopter rotors in a ship airwake[J]. Journal of Aircraft, 2014, 51(6): 1813-1832.
[14] BRÉZILLON J. Simulation of rotor-fuselage interactions by using an actuator disk[C]//26th European Rotorcraft Forum. Hague: Netherlands Association of Aeronautical Engineers, 2000.
[15] 孙鹏, 耿雪, 赵佳, 等. 风向对直升机旋翼与甲板流场结构影响[J]. 航空动力学报, 2015, 30(8): 1802-1810. SUN P, GENG X, ZHAO J, et al. Influence of wind directions on the flow field structures of helicopter rotor and deck[J]. Journal of Aerospace Power, 2015, 30(8): 1802-1810 (in Chinese).
[16] ROE P L. Approximate Riemann solvers, parameter vectors, and difference schemes[J]. Journal of Computational Physics, 1981, 43(2): 357-372.
[17] JAMESON A. Time dependent calculations using multigrid, with applications to unsteady flows past airfoils and wings: AIAA-1991-1596[R]. Reston: AIAA, 1991.
[18] KRISHNAMURTY V S, SHYY W. Study of compressibility modifications to the k-ε turbulence model[J]. Physics of Fluids, 1997, 9(9): 2769-2788.
[19] ZHANG F, XU H, BALL N G. Numerical simulation of unsteady flow over SFS 2 ship model: AIAA-2009-1981[R]. Reston: AIAA, 2009.
[20] MINECK R E, GORTON S A. Steady and periodic pressure measurements on a generic helicopter fuselage model in the presence of a rotor: NASA/TM-2000-210286[R]. Washington, D.C.: NASA, 2000.
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