摘要:

The subject of higher steam pressures and their application to the steam turbine has already been dealt with on several occasions during the last few years, and when the authors were asked to prepare a paper it was a question whether at the moment there were any additional facts which could usefully be brought before the engineering public.The purposes of this paper, therefore, are, in the first place, to set out in as simple a form as possible the theoretical and practical gains which may be expected from any increases in pressure over as wide a range as possible, at the same time taking into consideration other improvements which in recent years have been introduced into power station operation. Then an account—partly historical—is given of the work which has so far been done in the actual employment in steam turbines of pressures higher than those which we have come to regard as normal, and, in passing, reference is made to the design of high pressure boilers. Many examples of high-pressure steam turbines are described and classified and the effect of high pressures on the details of design is noted. Finally, the question of reliability of high-pressure installations in operation is discussed and comparison made with plants operating with more normal pressures.

DOI:10.1049/jiee-1.1928.0001

出版商:IEE    

年代:1928

数据来源: IET

DOI:10.1049/jiee-1.1928.0004

出版商:IEE    

年代:1928

数据来源: IET

DOI:10.1049/jiee-1.1928.0005

出版商:IEE    

年代:1928

数据来源: IET

DOI:10.1049/jiee-1.1928.0006

出版商:IEE    

年代:1928

数据来源: IET

摘要:

This paper aims at collecting together in convenient form data connected with recent developments in submarine cable design; it is not claimed that the methods set out are original.Rapid progress has been made in the past few years, during which the inductively loaded telegraph cable has been introduced, and, although some theoretical papers have been published, there is very little matter dealing with the whole question of submarine cable design. This paper traces the gradual increases of speed which have been obtained referring to theCRlaw, speed constants, duplex balance, and the limitation of speeds through external disturbances, with methods of reducing the latter. Examples are quoted.The development of the inductively loaded cable consequent on the introduction of high-permeability nickel-iron alloys is discussed and formul∟ are given for the attenuation and other constants. The cases when abbreviated formulae can be used are considered and necessary allowances and corrections are discussed.The paper concludes with some notes on the testing of laid cables.

DOI:10.1049/jiee-1.1928.0007

出版商:IEE    

年代:1928

数据来源: IET