ISSN:0022-1686    

DOI:10.1080/00221688909499105

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

This paper deals with the problems relating to the increase in discharge that EDF had absolutely to tackle for the Kembs propeller units located at the head of the network of the Rhine power plants. The solution consisted in increasing the diameter of propeller runners and in using a new blade design. The result obtained is a 30% gain of excess power. However, after 500 hours' operation, damage has appeared on the pressure side of blades and also, after 3000 hours, on the bottom ring. Calculations and model tests have been done to find out solutions to these problems.

ISSN:0022-1686    

DOI:10.1080/00221688909499106

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Jet interference in buckets and jet disturbance outside of buckets have been visually observed in a model runner for a 6-nozzle Pelton turbine. The visual observation has revealed that the jet from the first nozzle which entered into a bucket from the splitter and is now going to discharge out at the outcut of the bucket, is interfered by the jet from the second nozzle which has just entered into the outcut of the same bucket. Also, if the jet from the first nozzle which has discharged out at the outer brim of a bucket, is splashed radially outward and deflected by the nearest surfaces of deflector and/or nozzle to the outer surface of the second jet, severe jet disturbance occurs with the sharp efficiency deterioration.

ISSN:0022-1686    

DOI:10.1080/00221688909499107

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The phenomenon under consideration is represented as the superposition of two potential-flow motion fields, endowed with singularities ofhelicoidal shape.

ISSN:0022-1686    

DOI:10.1080/00221688909499108

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

This report deals, first of all, with a method to convert the rotational speed, discharge, power output, hydraulic, mechanical and volumetric efficiencies of a model turbine to the values of the prototype turbine: the method is analytically obtained using equations for calculating hydraulic performance of a turbine. Secondly, the loss distribution coefficient V in the efficiency conversion formula is determined from analyses of component losses in measured performances of 15 model Francis turbines and pump-turbines with various specific speeds. Variation of Kopl - the value of V at the optimum efficiency - with the specific speed, and variation of V with the operating conditions are analyzed and a method to determine V in any operating condition is presented.

ISSN:0022-1686    

DOI:10.1080/00221688909499109

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221688909499104

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor