The turbulent flow of water in a cylindrical, baffled vessel with an axial flow hydrofoil impeller, either a Chemineer HE3 (CHE3) or a Prochem Maxflo T (PMT), has been studied using a laser Doppler anemometer. Using ensemble averaging, the mean axial and radial flow and the associated fluctuating components were obtained for the whole of the vessel; plus similar data for the tangential component close to the impeller. Assuming axial symmetry, flow rates were calculated as were flow numbers and circulation flow numbers. Power numbers were also determined. AU the data obtained were used to compare the circulation efficiency of the two hydrofoils plus a pitched blade and a Rushton turbine. This comparison showed that the CHE3 required a power input of about 2/3 of that for the PMT and about 113 of that for the pitched blade and Rushton turbine to obtain the same axial-radial circulation in the tank. On a 6tudiC B I'aide d'un anCmomttre laser Doppler l'ckoulement d'eau turbulent dans un rCservoir cylindrique B chicanes muni d'une cine B patin (hydrofoil) B hulement axial, soit une "Chemineer HE3" (CHE3) ou une "Prochem Maxflo T" (PMT). A l'aide de technique de calcul de moyennes, l'koulement moyen radial et axial et les composantes fluctuantes associks ont 6th obtenus dans tout le rkservoir; des donnks semblables ont Cgalement Cd obtenues pour la composante tangentielle proche de la turbine. En supposant une symktrie axiale, les debits ont Cd calculds tout comme les nombres d'hulement et les nombres de circulation. Les nombres de puissances ont Cgalement Ctd dCterminh. Toutes les donnks obtenues ont 6d utilisks pour comparer I'eficacitC de la circulation des deux turbines B patin ainsi que celle d'une turbine B pale inclink et d'une turbine Rushton. Cette comparaison montre que le CHE3 requiert une alimentation en puissance d'environ 2/3 de celle du PMT et d'environ 113 de la puissance requise pour la pale inclink ou la turbine Rushton, et ce pour la m2me circulation axiale-radiale dans le rtservoir.
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