航天与力学的发展

对于力学在航天领域中的重要性,经历了一个认识过程。国内外航天飞行器多次失事的教训告诉我们,忽视航天领域的力学问题不仅影响到它们的性能,而且会带来难以估量的损失。联盟号飞船第一次飞行的船毁人亡,难道不与这个飞船的跨声速气动特性不理想有关吗?     

登高才能瞩远──《航天技术与现代社会》

登高才能瞩远──《航天技术与现代社会》庄逢甘我们的地球是一个整体，开发自然资源为全人类服务也是一个全球性的系统工程。自然资源的利用开发、经济的发展、民族的繁衍，这些需要全人类共同探索的课题，长期以来都因为生产力不发达而得不到令人满意的答案。过去很少有...     

登高才能瞩远——评《航天技术与现代社会》

我们的地球是一个整体,开发自然资源为全人类服务也是一个全球性的系统工程.自然资源的利用开发、经济的发展、民族的繁衍,这些需要全人类共同探索的课题,长期以来都因为生产力不发达而得不到令人满意的答案.过去很少有人能从全球大系统的角度透视这些问题,更不用说系统地实践了.不是人类不愿意,而是没有足够的技术手段.     

可压缩湍流的多尺度方程组

The short-range property of interactions between scales in the compressible turbulent flow was examined. An estimation of the short-range scale scope and some formulae for the short-range eddy stress and heat transfer etc. were given. A concept of resonant-range interactions between extremely contiguous scales was introduced and some formulae for the resonant-range eddy stress and heat transfer etc. were also given. Multi-scale equations for the compressible turbulent flows were presented. The multi-scale equations are approximately closed and do not contain any empirical constants. The compressibility effects on turbulence are determined by the Farve averaged variables and the nonlinear relationships between the Farve- and physical-averaged variables.     

不可压缩湍流的多尺度方程组

The short-range property of interactions between scales in incompressible turbulent flow was examined.Some formulae for the short-range eddy stress were given.A concept of resonant-range interactions between extremely contiguous scales was introduced and some formulae for the resonant-range eddy stress were also derived.Multi-scale epuations for the incompressible turbulent flows were proposed.