Flow Margin Improvement Of Existing Cooling Water Pumps With Respect To Extreme Part Load Operation Conditions
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In the present paper, the adaptation of existing cooling water pumps to extreme part load condition by cutting down the impeller in the meridional plane is described. The influence of different impeller shapes on the head curve characteristic and the development of the part load recirculation zone are investigated theoretically. The theoretical investigations are accompanied by model pump test. Besides the head curve and efficiency characteristics, the noise and vibration levels were measured and assessed for the different impeller shapes. The vibrations especially show a distinct characteristic that allows a very precise definition of limiting flowrate. Comparing the theoretical and experimental results, good agreement can be claimed. In particular, the onset of the part load recirculation is predicted very well. The results obtained for the model pump are successfully validated by prototype pumps.
Bross, Stephan; Amann, Peter; Baumgarten, Sven; Muller, Thomas (2000). Flow Margin Improvement Of Existing Cooling Water Pumps With Respect To Extreme Part Load Operation Conditions. Texas A&M University. Turbomachinery Laboratories. Available electronically from