Modifikace diagonálního čerpadla s ohledem na stabilitu Y-Q charakteristiky

The Modification of the Mixed Flow Pump with Respect to Stability of the Head Curve

abstrakt

en

The tested radiaxial pump shows the considerable pressure pulsations accompanied with the strong noise for the flow rates lower than 0.4QBEP. This fact makes almost impossible to determine experimentally the dependence of the specific energy on the flow rates close to shut-off point. Likewise, after relatively short running period the strong wear of blades occurs due to the cavitation damage.Original and modified designs of radiaxial pumps with the same design parameters will be used to demonstrate the above mentioned possibilities. First the disadvantages will be outlined and then possible solutions will be illustrated. Pump operation will be simulated by means of CFD software. Experimental characteristic curve is at disposal for the problematic pump.

Zkoumané diagonální čerpadlo vykazuje značé tlakové pulsace doprovázené silným hlukem pro průtoky nižší než 0.4Qopt. Díky této skutečnosti je téměř nemožné určit experimentálně závislost měrné energie na průtoku v blízkosti závěrného bodu. Také po relativně krátké době chodu dochází v důsledku kavitace k silnému opotřebení lopatek. Původní a modifikovaná konstrukce čerpadla se stejnými parametry byla použita k rověření výše uvedených nedostatků. Provoz čerpadla bude simulován pomocí softwaru CFD a je rovněž k dispozici charakteristická křivka měrné energie.

The tested radiaxial pump shows the considerable pressure pulsations accompanied with the strong noise for the flow rates lower than 0.4QBEP. This fact makes almost impossible to determine experimentally the dependence of the specific energy on the flow rates close to shut-off point. Likewise, after relatively short running period the strong wear of blades occurs due to the cavitation damage.Original and modified designs of radiaxial pumps with the same design parameters will be used to demonstrate the above mentioned possibilities. First the disadvantages will be outlined and then possible solutions will be illustrated. Pump operation will be simulated by means of CFD software. Experimental characteristic curve is at disposal for the problematic pump.

radiaxial pump, pressure pulsations , instability

14.05.2015

Amsterdam, The Netherlands

NEUVEDENO

298–304

6