【摘 要】
：
阻力是空气动力学最重要的气动力参数之一,湍流摩擦阻力的分解与预测是学术界普遍关心的热点问题.目前,湍流摩擦阻力分解方法多局限于不可压缩流动,例如FIK和EZD方法,而
【机 构】
：
上海交通大学航空航天学院,上海200240,中国
论文部分内容阅读
阻力是空气动力学最重要的气动力参数之一,湍流摩擦阻力的分解与预测是学术界普遍关心的热点问题.目前,湍流摩擦阻力分解方法多局限于不可压缩流动,例如FIK和EZD方法,而对于可压缩湍流边界层的摩擦阻力分解方法尚不完善.本文基于流向时均动能方程,提出了可压缩湍流边界层摩擦阻力分解理论,对光滑和复杂可压缩壁湍流摩擦阻力分解进行了严格的推导,并从物理角度讨论了摩擦阻力产生的机制.为评估可压缩性对湍流摩擦阻力的贡献,开展了超声速槽道流的直接数值模拟,马赫数M=1.5,3,雷诺数Reτ=215,450,850,利用可压缩湍流摩擦阻力分解理论,研究了可压缩性贡献随马赫数和雷诺数变化的变化趋势.研究结果表明流体可压缩性导致的附加分子粘性耗散贡献随马赫数增大而增大,随雷诺数增大而减小,本文进一步对粘性耗散和湍动能生成在槽道内的分布进行分析,物理地解释了边界层内湍流运动对摩擦阻力的影响.
其他文献
Coordination polymers or metal–organic frameworks(MOFs)are a class of crystalline materials,have potential applications in gas sorption and separation,lumi
A dihydrogen bond is an attractive interaction between a positively charged hydrogen and a negatively charged hydrogen.[1] As a result of the interaction,hy
Selenium-containing structures can be found in a diverse range of drug candidates,biologically active compounds,and functional organic materials.Moreover,th
Although many studies have confirmed that SnO2/graphene(SnO2/rGO)composites could be facile synthesized by SnCl2·H2O and graphene oxide,the as-prepared SnO
Functional metal-organic frameworks(MOFs)are of great interest in recent years because of their aesthetic structures and potential applications on gas stora
Three new Cu(Ⅱ)complexes,[Cu(phen)2(Htbph)2]n(1),[Cu(bipy)2(Htbph)2]n(2),and{[Cu(bpp)(tbph)]·H2O}n(3),(phen = 1,10-phenanthroline,bipy = 4,4-bipyridine,bp
Graphene materials have grabbed considerable attention for electromagnetic wave suppression due to their varieties of remarkable properties,including low de
On the basis of the Isolobal Analogy,B-N and C-C are iso-electronic so B,N-alkane analogs should have similar framework as alkanes and be generally occurred
电流体动力学(Electro-hydrodynamics)研究电场与不同流体介质流动的相互作用，属于流体力学与经典电磁场理论相互交叉的一门学科。基于电场驱动的流动技术因为无需运动部