FRANCIS TURBINE WHEEL

FIELD: hydroelectric stations and hydraulic drives. ^ SUBSTANCE: proposed device has blades with cylindrical surfaces arranged between rims. Generatrix of cylindrical surfaces is parallel to axis of hydraulic turbine and rises to axis of hydraulic turbine. Shape of blade of wheel is formed by angle of tilting of skeleton line of blade profile passing from larger part of blade profile changing according to linear dependence to constant profile on the rest of part and selection of parameters of wheel from the following relations: change of beta according to linear dependence from beta1 to beta2 on larger part of blade profile at distance from D1 to 1.01D2, beta=const=beta2 on the rest part from 1.01D2 to D2, range of rise of generatrix of blade surfaces from (0.08-0.20)D1 at liquid inlet to wheel to (0.15-0.30)D1 at outlet from wheel, D2/D1=(0.6-0.73) where D1 is outer diameter of wheel; D2 is inner diameter of wheel; D2/D1 is relative diameter of wheel; beta is angle of tilting of skeleton line of blade profile; beta1 is angle of tilting of inlet element of skeleton line of blade profile to circumferential direction; beta2 is angle of tilting of outlet element of blade skeleton line. ^ EFFECT: enlarged range of operation of Francis turbine. ^ 2 dwg