Computational Simulation and Analysis of Bell Boeing Quad Tiltrotor Aero Interaction

Chunhua Sheng; Jim C. Narramore

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Computational Simulation and Analysis of Bell Boeing Quad Tiltrotor Aero Interaction

机译：贝尔波音四旋耕机空气相互作用的计算仿真与分析

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The unsteady flow field and aerodynamic performance of the Bell's wind tunnel test model of the Bell Boeing Quad tiltrotor are predicted and analyzed using a Navier-Stokes computational fluid dynamics (CFD) solver. The Quad tiltrotor contains both front and rear rotor and wing systems, which create aerodynamic interference and periodic time-dependent loadings for the aircraft in various flight conditions. In this study, interference effects of the Quad tiltrotor in two critical flight conditions, an airplane mode and a transition mode at 75-deg nacelle tilt angle, are numerically investigated. Predicted aerodynamic performance and airloads on the Quad tiltrotor components are analyzed and compared with the Bell Helicopter's COPTER estimates. The unsteady velocity field induced by the front rotor system is extracted from the Quad tiltrotor simulation, which is required by COPTER code in the subsequent aeroelastic analysis to predict oscillatory loads and vibrations.

机译：使用Navier-Stokes计算流体力学（CFD）求解器来预测和分析Bell Boeing Quad倾转旋翼的Bell风洞测试模型的非稳态流场和空气动力学性能。 Quad倾转旋翼包含前后旋翼和机翼系统，可在各种飞行条件下为飞机产生空气动力干扰和与时间有关的周期性载荷。在这项研究中，数值研究了四倾转旋翼在两个关键飞行条件下的干扰效应，这两个条件是飞机模式和机舱倾斜角为75度的过渡模式。分析了预测的空气动力学性能和Quad倾转旋翼组件上的空气负荷，并将其与Bell Helicopter的COPTER估算值进行了比较。前转子系统引起的非定常速度场是从四倾转转子模拟中提取的，这是COPTER代码在随后的空气弹性分析中所必需的，以预测振荡载荷和振动。

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《Journal of the American Helicopter Society》 |2009年第4期|042002.1-042002.15|共15页
作者
Chunhua Sheng; Jim C. Narramore;
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作者单位

Mississippi State University Starkville, MS American Helicopter Society 64th Annual Forum, April 29-May 1, 2008, Montreal, Canada;

Bell Helicopter Textron, Inc. Fort Worth, TX;

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正文语种 eng
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C_D: rotor drag coefficient, D/(ρ_(ref)πR~3(ΩR)~2); C_F: force coefficient, F/(1/2ρ_(ref)U_(ref)~2L_(ref)~2); C_p: pressure coefficient, p/(1/2ρ_(ref)U_(ref)~2); C_Q: rotor torque coefficient, Q/(ρ_(ref)π R~3(ΩR)~2); C_T: rotor thrust coefficient, T/(ρ_(ref)πR~2(ΩR)~2); et al;

机译：C_D：转子阻力系数;D /（ρ_（ref）πR〜3（ΩR）〜2）;C_F：力系数;F /（1 /2ρ_（ref）U_（ref）〜2L_（ref）〜2）;C_p：压力系数;p /（1 /2ρ_（ref）U_（ref）〜2）;C_Q：转子转矩系数;Q /（ρ_（ref）πR〜3（ΩR）〜2）;C_T：转子推力系数;T /（ρ_（ref）πR〜2（ΩR）〜2）;等;

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Computational Simulation and Analysis of Bell Boeing Quad Tiltrotor Aero Interaction

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