CAJ | 학술논문

为了系统研究抽吸系数和抽吸方向对抽吸效果的影响以及抽吸效益与抽吸能耗之间的关系，以 NA-CA0012翼型表面分离流动为基准状态，在其吸力面设计了局部多孔抽吸结构，采用 Roe 格式和双时间步隐式算法（LU-SGS），从抽吸系数、抽吸方向和抽吸能耗等方面，数值研究了低雷诺数下多孔分布式抽吸结构对流动分离的控制效果，通过边界层速度线型的变化分析了抽吸控制机理。研究结果表明：在翼型吸力面流动分离点附近一定区域内进行抽吸，可有效抑制流动分离，改善翼型气动性能；随着抽吸系数的增加，升阻比先是快速增长然后缓慢下降，且升阻比最大值提高了约1．3倍。抽吸控制能量消耗评估显示抽吸系数在合理范围内时，控制能耗明显小于控制效益。抽吸角度对抽吸控制有显著影响，当抽吸角度较大时，不仅翼型升阻比获得了提升，而且抽吸控制所消耗的能量也会进一步减少。这些结果有助于进一步为流动控制设计提供新的思路和方法。
위료계통연구추흡계수화추흡방향대추흡효과적영향이급추흡효익여추흡능모지간적관계，이 NA-CA0012익형표면분리류동위기준상태，재기흡력면설계료국부다공추흡결구，채용 Roe 격식화쌍시간보은식산법（LU-SGS），종추흡계수、추흡방향화추흡능모등방면，수치연구료저뢰낙수하다공분포식추흡결구대류동분리적공제효과，통과변계층속도선형적변화분석료추흡공제궤리。연구결과표명：재익형흡력면류동분리점부근일정구역내진행추흡，가유효억제류동분리，개선익형기동성능；수착추흡계수적증가，승조비선시쾌속증장연후완만하강，차승조비최대치제고료약1．3배。추흡공제능량소모평고현시추흡계수재합리범위내시，공제능모명현소우공제효익。추흡각도대추흡공제유현저영향，당추흡각도교대시，불부익형승조비획득료제승，이차추흡공제소소모적능량야회진일보감소。저사결과유조우진일보위류동공제설계제공신적사로화방법。
In order to research the effect of suction coefficients and directions on suction control,and the relationship between effectiveness and cost of suction,a local suction distribution on the upper surface of the NACA0012 airfoil is designed to control the flow separation.The effectiveness of the designed suction distribution is investigated numerically using Roe scheme and LU-SGS implicit scheme with dual-time-stepping technique.The mechanism of suction con-trol is analyzed by comparing the velocity profiles in the boundary layer.The penalty for utilizing suction control is also estimated.The computational results show that the designed suction distri-bution is capable of suppressing the flow separations and improving the aerodynamic perform-ances.With the increase of the suction coefficients,the lift-to-drag ratio increases fast firstly and then decrease slowly,while the maximum increase is about 130%.The analysis of energy consumption shows that the cost for using suction to suppress separation flow is relatively small with an appropriate suction coefficient.The effect of suction angles on suction control is obvious. As the suction angle becomes larger,not only the lift-to-drag ratio increases,but also the cost of suction decreases.These results will further help to provide new ideas and methods for flow control design.