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STUDY OF INTERNAL RECIRCULATION IN ROTO-DYNAMIC PUMPS OPERATING AT PARTIAL CAPACITY

Objective


The goal of this project was to study recirculation inrotodynamic pumps and create a body of knowledge needed to reduce the intensity of partial load recirulations and their effects by improving pump design.
2 different geometries of impellers have been partly studied. The flow field and losses at partial loads were analysed experimentally with the aid of advanced measuring techniques, including the application of adapted laser velocimetry. Though the results have not been totally treated and exploited, they should allow an optimized design for rotodynamic pumps used outside normal conditions including oil, petrochemistry, nuclear plants and irrigation.
It is hoped that the results will allow improvement in the design of pumps to optimize their operation for partial loads and improve their reliability in abnormal conditions. Specifically, the study should lead to developments that reduce the intensity of recirculation and its effects on rotodynamic pumps.
IN MANY INDUSTRIAL APPLICATIONS ROTODYNAMIC PUMPS MUST OPERATE AT FLOW RATES SMALLER THAN THE DESIGNED FLOW RATE. AT PART LOAD CONDITIONS THE PUMP RELIABILITY CAN BE IMPAIRED BY INTERNAL FLOW RECIRCULATIONS CAUSING VIBRATIONS, NOISE AND CAVITATION DAMAGE. ALSO, THE PART LOAD RECIRCULATIONS CAUSE PUMP INSTABILITY, PRESSURE AND DISCHARGE PULSATIONS BEING HARMFUL FOR PLANT COMPONENTS. IMPROVING THE RELIABILITY FOR PART LOAD OPERATION IS A CHANCE FOR EUROPEAN PUMP MANUFACTURERS TO ENHANCE THEIR POSITION IN THE WORLD PUMP MARKET.

THE GOAL OF THE RESEARCH PROJECT IS TO CREATE THE KNOWLEDGE WHICH IS NEEDED TO REDUCE THE INTENSITY OF PART LOAD RECIRCULATIONS AND THEIR EFFECTS BY MEANS OF IMPROVED DESIGN. FOR 5 DIFFERENT PUMP IMPELLERS (SPECIALLY DESIGNED FOR THIS PROJECT) THE FLOW FIELD AND LOSSES AT PART LOAD WILL BE ANALYSED EXPERIMENTALLY WITH THE AID OF ADVANCED MEASURING TECHNIQUES (INCLUDING THE APPLICATION OF ADAPTED LASER VELOCIMETRY).
RESULTS WILL BE USED TO CHECK AND TO IMPROVE COMPUTER-AIDED CALCULATION AND DESIGN METHODS.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Centre Technique des Industries Mécaniques (CETIM)
Address
52 Avenue Félix Louat
60304 Senlis
France

Participants (3)

DARMSTADT UNIVERSITY OF TECHNOLOGY
Germany
Address
Karolinenplatz 5
Darmstadt
Klein, Schanzlin & Becker AG
Germany
Address
Johann Klein Straße 9
67227 Frankenthal
Sulzer Weise GmbH
Germany
Address

76646 Bruchsal