비속도의 큰 변화가 극저비속도 원심펌프의 성능에 미치는 영향 = Influence of Large Change of Specific Speed on the Performance of Very Low Specific Speed Centrifugal Pump

다국어 초록 (Multilingual Abstract)

Efficiency of a centrifugal pump is known to drop rapidly with a decrease of specific speed ns. However, below ns=60 [min-1, m3/min, m], the pump characteristics are not yet clear. Therefore, present study is aimed to investigate the influence of large change of specific speed on the performance of a very low specific speed centrifugal pump. Moreover, influence of impeller configuration on the performance of very low specific speed pump is investigated. The results show that very low specific speed can be accomplished by reducing volute throat sectional area using circular spacer. Influence of the spacer's location and configuration in the discharge passage on the pump performance is very small. Best efficiency of very low specific speed centrifugal pump decreases proportionally to the specific speed but the best efficiency decreases on a large scale in the range of ns＜40. Influence of impeller configuration on the pump performance and radial thrust of centrifugal pump are considerably small in the range of extremely low specific speed (ns=25).1. 서 론* 요코하마국립대학 대학원 공학연구원

참고문헌 (Reference)

1 "원형케이싱이 극저비속도 원심펌프의 성능에 미치는 영향" 2005

2 "The Flow in Volutes and Its Effects on Centrifugal Pump Performance" 177 : -31, pp.843~871.

3 "Study on Optimum Configuration of a Volute Pump of Very Low Specific Speed" 66 (66): 1132-1139, 2000

4 "Performance of Low Specific Speed Centrifugal Pump Turbomachinery Society of Japan" 18 : 300-307, 1990

5 "A Review of Slip Factors for Centrifugal Impellers" ser. a (ser. a): -4, pp.558~572.