机翼后缘连续变弯度对客机气动特性影响

来源 :北京航空航天大学学报 | 被引量 : 0次 | 上传用户:chf012183
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
后缘连续变弯度机翼在提高民用客机气动特性方面有较大的潜力,近年来被广泛关注。基于建立的全局优化设计系统,研究了机翼后缘连续变弯度对宽体客机翼身组合体气动特性的影响。首先,采用自由型面变形(FFD)技术建立了后缘连续变弯度的参数化方法。然后,采用RANS方程作为流场评估方法,针对翼身组合体构型设计点附近升力系数开展了机翼后缘连续变弯度气动减阻优化设计。最后,探索了仅外翼段后缘连续变弯度和内外翼后缘均连续变弯度优化设计结果的异同。优化结果表明,升力系数小于设计升力系数时,在只考虑外翼段后缘连续变弯度的设计中,不易实现激波阻力和诱导阻力同时降低,考虑内翼段后缘连续变弯度后,减阻量较前者更为明显;升力系数大于设计升力系数时,外翼段和内外翼的后缘偏转均可实现诱导阻力和激波阻力的同时降低,且减阻量相差不大。 The trailing edge continuous turning camber wing has great potential in improving the aerodynamic characteristics of civil aircraft, and has been widely concerned in recent years. Based on the established global optimization design system, the effect of continuous turning on the trailing edge of the wing on the aerodynamic characteristics of a wide body passenger aircraft wing assembly is studied. First of all, a parametric method of continuous camber of trailing edge was established by using free surface deformation (FFD) technique. Then, using the RANS equation as the flow field assessment method, aiming at the lift coefficient near the design point of the wing-body assembly, the aerodynamic drag reducing optimization of the trailing edge of the wing was carried out. Finally, the similarities and differences between the results of continuous curvature optimization of only the outer edge of the outer segment and the continuous variation of the trailing edge of the inner and outer wings were explored. The optimization results show that when the lift coefficient is less than the design lift coefficient, it is not easy to reduce both the shock resistance and the induced resistance in the design considering only the continuous camber of the trailing edge of the outer wing segment. After considering the continuous camber of the trailing edge of the inner wing segment, The resistance is more obvious than the former; when the lift coefficient is greater than the design lift coefficient, the trailing edge deflection of the outer wing segments and the inner and outer wings can both reduce the induced resistance and the shock resistance, and the drag reduction amounts are not much different.
其他文献
目的评价c-Jun氨基末端激酶(JNK)信号通路和p38丝裂原活化蛋白激酶(p38MAPK)信号通路在吗啡预处理减轻心力衰竭大鼠心肌缺血再灌注损伤中的作用。方法健康成年雄性SD大鼠,200~230 g,尾静脉注射盐酸多柔比星2 mg/kg,1次/周,连续6周,建立大鼠慢性心力衰竭模型。于第8周末,取成功制备慢性心力衰竭模型的45只大鼠,采用随机数字表法分为5组(n=9):假手术组(S组)、缺血再灌
行贿这事,很早就有了,从古到今,哪朝哪代,都少不了,但是具体从哪个朝代开始的,我还真的没有好好去研究.说实在的我对行贿这玩意儿并不感兴趣.
烟叶精片选工作的有序开展,是打叶复烤环节高品质实施的前提.为此,本文从烟叶品质、烟叶处理流程等方面,探究烟叶精片选在打叶复烤中的作用,以达到把握烟叶精片选择要素,提升
[编者按] 口腔正畸治疗的诊断分析、矫治设计以及治疗的基本理论和技能是十分重要的.各种不同的矫治技术,不论是方丝弓矫治技术、直丝弓矫治技术,还是多曲方丝弓矫治技术,虽然各有特点,但都建立在相同的矫治基础上,如矫治中的支抗设计和矫治牙移动的控制等方面。
针对机载对地观测载机长时间匀速直线飞行时分布式位置姿态测量系统(POS)姿态误差随时间积累的问题,基于载机有效机动能够提高分布式POS系统可观测度进而提高系统估计精度的
为了进一步提高电子束流发生系统工作的可靠性和稳定性,提高电子束加工质量,采用AC-DC-AC-DC-AC-DC的拓扑电路、新型功率变压器、高压脉冲检测技术、优化的束流反馈控制与灯
例1 患者男性,45岁,因""心悸、呼吸困难1年加重10天""入院.体检示胸骨右缘3~4肋间收缩期杂音,P2亢进.心电图(ECG)示SⅠQⅢ,TⅠ、Ⅲ低平,TV1~4倒置,不完全性右束支传导阻滞.X线胸片示右肺纹理稀疏.超高速CT和肺动脉造影显示""右室流出道、主肺动脉内巨大充盈缺损,右肺动脉未显影"".核素扫描示""右肺未显影,下肢深静脉回流不畅及侧枝循环形成"".超声发现右房室明显扩大,重度肺
知道工作为什么是美丽的吗? 因为它能够让你公然离开法定配偶长达8小时。 知道短信为什么是流行的吗? 因为“祝你新年快乐”的SMS,收的是我的Money! Everything can be expl
期刊
送变电工程是通过电压的升降调整,进行电能的安全稳定传送.众所周知,很多的变电所搭建在人力稀少的偏远地区,但是电能的主要使用端,则集中在人口集中的繁华城市当中.要实现稳
目的探讨白藜芦醇对肠缺血再灌注诱发大鼠肺损伤及肺组织肥大细胞活化的影响。方法清洁级健康雌性SD大鼠30只,体重180~220 g,4~5月龄,采用随机数字表法分为3组(n=10):假手术组(Sham组)、肠缺血再灌注组(II/R组)和白藜芦醇组(Res组)。采用夹闭肠系膜上动脉75 min再灌注4 h的方法制备大鼠肠缺血再灌注诱发肺损伤模型。Res组于模型建立前5 d腹腔注射白藜芦醇15 mg/k