The paper reports the substantiation of possibility rotary pump efficiency increase in view of hydraulic losses decrease in a centrifugal wheel at the expense of convergence introduction in its inter-blade canal. Besides losses decrease in a pump the transition to a convergent flow in a centrifugal wheel allows using the model of ideal liquid flow that was impossible at liquid flow in a diffusion inter-blade canal of a wheel providing mainly for an empirical direction of investigations. The convergence introduction, as it was shown by experiments, exceeds pump efficiency by 19% and pres-sure by 74% at the decrease of pulsation and vibrations of a pump that lightens the work of bearings. Theoretical investigations and experimental data have shown that at the convergent inter-blade canal of a wheel at the pump energy efficiency increase there is a situation of a flow different from the flow in the diffusion inter-blade canal. In such a way, the coefficient of the influence of a finite number of blades exceeds a unit, the angle of flow deviation at the wheel outlet takes a negative value (an angle of flow exceeds a bladeexit angle) and a theoretical pressure turns out to be higher considerably of a theoretical pressure at an infinite number of blades.
rotary pump, energy efficiency, convergent wheel, inter-blade canal, fluid flow, efficiency
1. Chernyak, А.P. Dependence of coefficient µ of jet wheel in rotary pump upon its geometrical parameters and operation mode / А.P.Chernyak // Impeller Machines and Blasters. -1966. - № 1. - pp. 176-203.
2. Borovsky, B.I. Highspeed Blade Pumps / B.I.Borovsky, N.S.Yershov, B.V.Ovsyannikov [et al.]; under the editorship of B.V. Ovsyannikov and V.F. Chebaevsky. - М.: Mechanical Engineering, 1975. - pp. 336.
3. Lokshin, I.L. Results application of rotating circular grates investigation to aerodynamic computation of centrifugal fans wheels / I.L.Lokshin // Industrial Aerodynamics. - 1963. - № 25. - pp. 121-183.
4. Borovsky, B.I. Investigation of pulsations and vibrations in centrifugal pump with convergent wheel / B.I.Borovsky, V.I.Petrov, А.I.Chucherov [et al.] // Hydro-gasdynamics and Heat-mass Exchange in Aircrafts. - 1988. - pp. 22-25.
