PARAMETER ANALYSIS ON CIRCULATION CONTROLLED CIRCULAR CYLINDER FOR NOTAR^TM TAIL BOOM  

作　　者：李家春 杨卫东 高宁 

机构地区：[1]National Key Laboratory of Rotorcraft Aeromechanics,Nanjing University of Aeronautics and Astronautics [2]Institute of Unmanned Aerial Vehicle,Nanjing University of Aeronautics and Astronautics

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2013年第3期282-291,共10页南京航空航天大学学报（英文版）

摘　　要：Lift on circulation control(CC)circular cylinder is calculated via numerical simulations based on 2Drealizable k-εepsilon viscous model and compared with experimental data.The simulation result shows an acceptable agreement with tested data.With the proved grid and simulation method,series of simulations are conducted to study the effect of parameters on lift.Single slotted tail booms under different down wash velocities are optimized with the principle of generating maximum total moment around the main rotor shaft with same total power consumption.The results show that larger jet flow velocity,or smaller blow angle,or larger diameter of the cross section can help generating larger lift while enhancing the attachment of both the jet flow and down wash flow.Multiple slotted tail boom is better because it increases lift with same total slot width,and can increase lift by increasing total slot width without causing separation,also it helps generating high steady lift at a big rank of slot attack angles.To mount a guide vane(GV)at the exit of the slot,or shape the upper slot wall like a smooth-GV,or design the slot with an edge fillet is not recommended because it reduces the velocity of both the jet flow and the upstream of the attached downwash flow.Compared with other shapes of the slots,arcs-profiled slot performs better because of larger jet flow velocity and smaller blow angle.In order to generate the largest moment with same total power consumed by the entire NOTARTMsystem,total width of the slots and slot attack angle should be optimized according to velocity of down wash flow.Lift on circulation control （CC） circular cylinder is calculated via numerical simulations based on 2D real- izable k-e epsilon viscous model and compared with experimental data. The simulation result shows an acceptable agreement with tested data. With the proved grid and simulation method, series of simulations are conducted to study the effect of parameters on lift. Single slotted tail booms under different clown wash velocities are optimized with the principle of generating maximum total moment around the main rotor shaft with same total power con- sumption. The results show that larger jet flow velocity, or smaller blow angle, or larger diameter of the cross section can help generating larger lift while enhancing the attachment of both the jet flow and down wash flow. Multiple slotted tail boom is better because it increases lift with same total slot width, and can increase lift by in- creasing total slot width without causing separation, also it helps generating high steady lift at a big rank of slot at- tack angles. To mount a guide vane （GV） at the exit of the slot, or shape the upper slot wall like a smooth-GV, or design the slot with an edge fillet is not recommended because it reduces the velocity of both the jet flow and the upstream of the attached downwash flow. Compared with other shapes of the slots, arcs-profiled slot performs better because of larger jet flow velocity and smaller blow angle. In order to generate the largest moment with same total power consumed by the entire NOTARTM system, total width of the slots and slot attack angle should be optimized according to velocity of down wash flow.

关 键 词：HELICOPTER AERODYNAMICS NOTARTM circulation control 

分 类 号：O355[理学—流体力学]