Method for designing centrifugal pump and mixed flow pump having specific speed of 150-1200

Patent metadata

Field	Value
Publication number	US-10474787-B2
Application number	US-201415106672-A
Country	US
Kind code	B2
Filing date	Dec 16, 2014
Priority date	Dec 20, 2013
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A method for designing a centrifugal pump and a mixed flow pump having a specific speed of 150-1200 comprises a design specification determination step for a turbo pump including an impeller, a specific speed determination step for the impeller, a design variable determination step for the impeller, and a three dimensional shape deriving step for the impeller. According to the present invention, the three dimensional shape of the impeller can be simply designed by converting the design variables related to the specific speed into a function and by putting optimized design variables into a database.

First claim

What is claimed is:

1. A method of generating a three-dimensional (3D) image of an impeller for a turbo pump, the method comprising the steps of:
determining design specifications of the turbo pump, the design specifications including a flow rate, a head, and a number of revolutions;
determining a specific speed of the impeller, wherein the specific speed is a dimensionless number representing a type of the turbo pump with a relational formula of the flow rate, the head, and the number of revolutions;
determining design variables of the impeller, wherein the step of determining design variables of the impeller includes generating a vane shape of the impeller via a meridional view design operation and generating a vane angle of the impeller via a vane angle design operation, wherein the meridional view design operation includes inputting design variables of a meridional plane of the impeller, wherein the design variables of the meridional plane include an inner diameter R 1 h of a hub at an inlet of the impeller, an inner diameter R 1 t of a shroud at the inlet of the impeller, an angle φ 1 at a leading edge of a vane of the impeller, a diameter R 2 of an outlet of the impeller, a vane width b 2 at a trailing edge of the vane of the impeller, an angle φ 2 at the trailing edge of the vane, and an axial direction length Ztip from an inlet to an outlet of the shroud, wherein the angle φ 1 at the leading edge of the vane of the impeller has tendencies according to sections of a specific speed of 150 to 1200 Ns, wherein the angle φ 1 of the leading edge of the vane is provided in a database, the database being prepared by converting the tendencies of the design variables of the impeller according to the specific speed into functions; and
generating a 3D shape of the impeller.

2. The method of claim 1 , wherein the turbo pump includes a centrifugal pump and a mixed flow pump, and
a specific speed of the centrifugal pump is lower than a specific speed of the mixed flow pump.

3. The method of claim 2 , wherein the specific speed of the centrifugal pump is determined within a range of 150 to 600 Ns, and
the specific speed of the mixed flow pump is determined within a range of 400 to 1200 Ns.

4. The method of claim 1 , wherein the angle Φ has tendencies in units of 70 Ns within a range of 150 to 360 Ns and has tendencies in units of 150 Ns within a range of 250 to 1200 Ns.

5. The method of claim 1 , wherein the vane angle design operation includes inputting design variables of a vane plane development of the impeller, and
the design variables of the vane plane development include an inlet angle beta 1 _(h,m,t), an outlet angle beta 2 _(h,m,t), a length % beta_LE_(h,m,t) of a straight line portion of an inlet, a length % beta_TE_(h,m,t) of a straight line portion of an outlet, and an angle d_theta(m,h) at which the outlet is tilted in a rotation direction.

6. The method of claim 5 , wherein the angle d_theta(m,h) has tendencies according to sections of the specific speed of 150 Ns to 1200 Ns.

7. The method of claim 1 , wherein the design specifications of the turbo pump are defined as a flow rate, a head, and a number of revolutions, and the specific speed is a dimensionless number representing a type of the turbo pump with a relational formula of the flow rate, the head, and the number of revolutions.

Assignees

• Korea Inst Ind Tech

Inventors

• Choi Young Seok
• Lee Kyoung Yong
• Kim Sung

Classifications

• F04D15/0088 Primary

  Testing machines · CPC title

• G06F30/20

  Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30) · CPC title

• G06F30/00

  Computer-aided design [CAD] · CPC title

• G06F30/17

  Mechanical parametric or variational design · CPC title

• F04D29/2205 Primary

  Conventional flow pattern · CPC title