CAJ | 학술논문

连续型和离散型协同射流是一种新型的翼型近壁面流动控制技术，相比之下，离散型能够更为高效地对流动进行控制。为探究离散型协同射流能耗更低、效率更高的原因，通过数值模拟方法重点研究了施加离散型协同射流的翼型流动控制效应与规律。计算结果表明在相同喷口动量系数下，与连续型相比，离散型最大升力系数提高9?2％，阻力极大减小；消耗相同功率时，离散型减阻效果明显高于连续型，零度迎角时阻力约小35％，翼型升阻特性提升更加显著。对流场的详细分析表明，离散型协同射流同时在流向和展向产生相干涡结构，使高速度的射流与主流以及边界层充分混合，因此离散型协同射流具有更好的翼型增升减阻效果和更高的能量利用率。
련속형화리산형협동사류시일충신형적익형근벽면류동공제기술，상비지하，리산형능구경위고효지대류동진행공제。위탐구리산형협동사류능모경저、효솔경고적원인，통과수치모의방법중점연구료시가리산형협동사류적익형류동공제효응여규률。계산결과표명재상동분구동량계수하，여련속형상비，리산형최대승력계수제고9?2％，조력겁대감소；소모상동공솔시，리산형감조효과명현고우련속형，령도영각시조력약소35％，익형승조특성제승경가현저。대류장적상세분석표명，리산형협동사류동시재류향화전향산생상간와결구，사고속도적사류여주류이급변계층충분혼합，인차리산형협동사류구유경호적익형증승감조효과화경고적능량이용솔。
Continuous Co?Flow Jet ( CCFJ) and Discrete Co?Flow Jet ( DCFJ) are new near?the?wall flow control methods for airfoils and compared with CCFJ, DCFJ is more efficient. We mainly focus on flow control effect and mechanism of DCFJ using numerical simulation. For the same jet momentum coefficient, DCFJ airfoil can achieve up to a 9?2% increase of maximum lift and simultaneously reduce aerodynamic drag. For the same power consump?tion, DCFJ is more striking in drag reduction. The drag is reduced 35%compared with CCFJ at zero angle of attack. The aerodynamic performance of airfoil is enhanced significantly. Simulation results and their analysis indicate pre?liminarily that a DCFJ airfoil generates both streamwise and spanwise vortex structures to mix the high speed jet with main flow and boundary layer thoroughly. Because of this mixing, DCFJ is highly efficient and more effective for in?creasing lift and reducing drag.