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Numerical Simulation of Aerodynamic Characteristics of Helicopter Rotor with tip Slots

Transactions of Nanjing University of Aeronautics and Astronautics 2018年第6期35卷 942-951页

作者： Chen Rongqian Wang Xu Cheng Qiyou Zhu Chengxiang You Yancheng School of Aerospace Engineering Xiamen UniversityXiamen 361005P.R.China AECC Hunan Aviation Powerplant Research Institute Zhuzhou 412002P.R.China Science and Technology on Rotorcraft Aeromechanics Laboratory China Helicopter Research and Development InstituteJingdezhen 333001P.R.China

Effects of tip slots on the aerodynamic characteristics of helicopter rotor were investigated numerically by solving three-dimensional Navier-Stokes equations based on unstructured overset grids algorithm.Improved delayed detached eddy simulation (IDDES) based on the Spalart-Allmaras turbulence model and adaptive grid refinement technique were employed.Several slots in the rotor blade tip were designed on the base of Caradonna-Tung rotor to study the effect of tip slots.Numerical results show that tip slots are able to introduce the airflow from the leading edge and turn it in the spanwise direction to be ejected out of the face at the rotor blade tip,which can reduce the strength of the rotor blade tip vortex and accelerate the dissipation process.Although tip slots may lead to the decrease of airfoils' lift coefficient at the root of the rotor blade,it can increase the lift coefficient of airfoils at the rotor blade tip,so the lift of the rotor with tip slots is almost the same as that of the rotor without tip slots.In addition,tip slots can also reduce the intensity of the tip shock wave,which is beneficial to reduce the wave drag of the rotor.

关键词： tip slots tip-vortex alleviation helicopter rotor numerical simulation

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