Гидродинамика

SUMMARY 369 T h e pressure on the wall P —J" pds^pzv J sinh''(i®, (15) a.s p = ~ Ргу sinh 8. B y applying his method Joukowsky solves a large number of problems, enumerated in the Table of Contents. Tha majo ­ r i t y o f them have not been solved by anyone before. These p r o b l ems are the following. T h e first class of problems embraces those dealing with the e f f l ux of a fluid from vessels. The problems belonging t o this class are those of the efflux from a symmetrical and from an unsymmetrical vessel having infinite flat walls ( § 4 and 6), and from a vessel of finite width and of infinite height, or vice versa (§ 1 1 and 13); somewhat by itself stands the problem of the efflux from an infinite'vessel through a mouthpiece (§ 16). Th e second class of problems embraces those of the impact of a stream. The problems considered are those of the impact aga ins t a symmetrical, symmetrically disposed wedge, and against an unsymmetrical wedge (§ 5 and7 ); the impact against a plate placed at the free surface of the stream (§ 1.0); the impact against an angle plate, the fluid impinging along the edge of the plate (§ 12); the impact of a stream bounded by parallel •walls against a symmetrical wedge ( § 14); the impact against a rectangular vessel (§ 15); the impact against a plate obstructing the entrance to a channel with parallel walls (§ 17). Finally, there are problems dealing with the impact of jets, viz. the impact against a symmetrical wedge (§ 8); the mutual impact of two jets (§ 9); the impact against a plate at the out ­ let f r om a channel with parallel walls ( § 18); the problem of concentrating a jet (§ 19). The work ends with a discussion of the case of a stream passing through a lattice (§ 20). Owing to a certain inaccuracy admitted, the author believed the formulae relating to a lattice to answer the problem of the action of turbines; but an analysis of t he formulae given has shown that the oncoming stream at 2 4 3aic. 17. — H. E. 5Куковский. Том Ш.