摘要:

For pump tests in hot water and other liquids, the required NPSH is less than with cold water. Cavitation erosion is less violent. Cavitation inception is delayed by thermodynamic effects, which depend on numerous parameters. The heat of vaporization is drawn from the surrounding liquid and this causes a drop in temperature in the cavity, connected with a lower pressure of vaporization. Adequate grouping of parameters allows comparison between fluids, test facilities, and even transposition of test results between different models such as ogives, Venturis and pumps. There are more numerous parameters which influence cavitation erosion and it was not yet possible to classify the amount and rate of erosion, like it has been done successfully with cavitation inception.

ISSN:0022-1686    

DOI:10.1080/00221688109499505

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221688109499506

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

An investigation is presented into the use of submerged jests as a means of stabilizing the location of the hydraulic jump, instead of the traditional method of constructing blocks and baffles. Using jets of water issueing from underneath the channel bed to produce a force against the oncoming supercritical flow, a hydraulic jump is formed which requires a smaller tailwater depth. The theoretical analysis of the jet-assisted hydraulic jump is presented in graphical form and verified experimentally using a specially designed model which fits into a small closed circuit laboratory flume. The stabilization of the jump is dependent on a number of parameters but it appears that the angle of inclination of the jets has the most pronounced effect.

ISSN:0022-1686    

DOI:10.1080/00221688109499507

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

This paper presents the results of an experimental study on erosion caused by (submerged) plane wall jets of air and water on beds of sand and polystyrene in Part I and by (submerged) impinging plane jets of water and air on beds of sand. The characteristic features of the scoured bed in the asymptotic state has been analysed using dimensional analysis.

ISSN:0022-1686    

DOI:10.1080/00221688109499508

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221688109499509

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221688109499510

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221688109499504

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor