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Licensed Unlicensed Requires Authentication Published by De Gruyter April 21, 2020

Blade Number Selection for a Splittered Mixed-Flow Compressor Impeller Using Improved Loss Model

  • Hang Xiang , Jiang Chen EMAIL logo , Jinxin Cheng and Xiancheng Song

Abstract

An improved mean streamline loss model for splittered centrifugal/mixed-flow compressor impellers is presented. One-dimensional model predictions, CFD simulations and experimental results for Krain impeller are compared to confirm the model validity. A new description for the interaction between blade number and splitter blade length of a splittered mixed-flow compressor impeller with high hub/tip ratio is discussed and formulized. The optimal principal blade number and optimal splitter blade length corresponding to maximum impeller efficiency are selected by the new formulas studied. The results indicate that the improved model and new formulas have reasonable prediction effects for the impeller efficiency and the selection of blade number and splitter blade length. Blade height/pitch ratio can also be adopted as a selection reference especially for high hub/tip impellers. Effective blade number or equivalent solidity is only suitable for evaluating load capacity rather than efficiency in impeller design processes.

PACS: 47.85.Gj

Nomenclature

A

blade passage area

AR

aspect ratio

b

hub-to-shroud passage width

C

absolute velocity

C f

skin friction coefficient

D

diffusion factor

d

diameter

d H

hydraulic diameter

F

shape factor

HR

hub/tip ratio

h

blade height

I

work input coefficient

L

blade length

L c

blade chord length

m ˙

mass flow

P

total pressure

Re

Reynolds number

R n

rotate speed

R ˉ

r 1 + r 2 / r 2 r 1

r

radius

s

pitch

T

total temperature

t

blade thickness

U

blade tangential velocity

W

relative velocity

Z

principal blade number

β

blade angle with respect to tangent

γ

meridional streamline slope angle

Δ q

adiabatic head loss coefficient

δ

tip clearance

ζ

dimensionless splitter blade length

η

adiabatic efficiency

λ b

tip distortion factor

π r

total pressure ratio

ρ

gas density

σ

slip factor

τ

solidity

ϕ

flow coefficient

ω

rotate angular speed

subscripts
B

principal blade parameter

bl

blade loading

cl

clearance gap parameter

eq

equivalent

eff

effective

h

hub

hs

hub-to-shroud loading

inc

incidence

m

meridional, mean

mix

wake mixing

out

outlet

s

splitter blade (inlet)

sep

free stream fluid in wake

sf

skin friction

t

tip

th

throat

total

total parameter

u

tangential

z

axial

1

impeller inlet

2

impeller outlet

Acknowledgements

This research is supported by National Science and Technology Major Project (2017-II-0006-0004), Natural Science Foundation of China (51576007) and Civil Aircraft Special Project Research of China (MJZ-2017-D-30).

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Received: 2020-02-27
Accepted: 2020-03-08
Published Online: 2020-04-21
Published in Print: 2022-12-16

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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