SU1222902A1 - Rotor of centrifugal turbomachine - Google Patents

Description

one

The invention relates to pumping and compressor engineering, namely to the designs of impellers of centrifugal turbomachines.

The purpose of the invention is to increase the efficiency of the turbomachine.

FIG. 1 shows the impeller, the meridional section; in fig. 2 is a view A of FIG. 1 (slave drive).

The impeller contains a master 1 and a slave 2 disks and blades 3 located between them with rear sides 4, while in the driven disk 2 along the rear sides of 4 blades 3, holes 5 are made at an acute angle a to the surface b of disk 2 in the direction of the wheel 7 output. Holes 5 are located on the site of 0.7-0.8 length of the blade 3 from the entrance to the wheel.

When the turbomachine is in operation, the working medium from the exit 7 of the impeller under increased pressure flows through the holes 5 into the interscapular channels. The location of the holes in the area of 0.7-0.8 length t shovels 1222902

3 from the entrance to the wheel provides energy to the area with a highly developed boundary layer, which is located on the surface 6 of the driven disk 2 from the rear sides of 4 blades 3 in the specified area (0.7-0.8 from the entrance to the wheel). Making the holes 5 at an acute angle o to the surface 6 of the disk 2 leads to an increase in the kinetic energy of the boundary layer without disrupting the structure of the main flow.

As a result, the low-energy flow zone is eliminated, possible boundary layer separation is prevented, hydraulic losses are reduced, flow rates at the wheel outlet 7 are leveled and, as a result, the wheel efficiency increases.

and the following outlet. By aligning the flow at the wheel outlet, the vibro-acoustic characteristics of the turbomachine are improved.

With the location of the holes 5 in the specified area, the efficiency increases by I -1.3%

the smaller the angle a, the greater the efficiency.

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Compiled by V. Devisilov

Editor S. SaenkoTehred I. VeresKorrektor A. Tsko

Order 1689/35 Circulation 586 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk iab., 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Claims (1)

A WORKING WHEEL OF A CENTRIFUGAL TURBO MACHINE, comprising a driving and driven disks and vanes located between them with rear sides, and in the driven disk along the rear sides of the vanes holes are made at an acute angle to the surface of the disk in the direction of wheel exit, characterized in that, in order to increase the efficiency, the holes are located on a 0.7-0.8 length of the blade from the entrance to the wheel. (put./>