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Mean streamline analysis for performance prediction of cross-flow fans

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Abstract

This paper presents the mean streamline analysis using the empirical loss correlations for performance prediction of cross-flow fans. Comparison of overall performance predictions with test data of a cross-flow fan system with a simplified vortex wall scroll casing and with the published experimental characteristics for a cross-flow fan has been carried out to demonstrate the accuracy of the proposed method. Predicted performance curves by the present mean streamline analysis agree well with experimental data for two different cross-flow fans over the normal operating conditions. The prediction method presented herein can be used efficiently as a tool for the preliminary design and performance analysis of general-purpose cross-flow fans.

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Abbreviations

A :

Cross-sectional area

C f :

Skin friction coefficient

D :

Diameter

D hyd :

Impeller average hydraulic diameter

g :

Gravitational acceleration

H :

Total head

L :

Longitudinal axial length of impeller

L b :

Impeller flow length

P in :

Input power

Q :

Volume flow rate

S:

Surface area

U :

Tangential impeller speed

V :

Absolute velocity

\(\bar V\) :

Average velocity at measuring station

V slip :

Slip velocity

W ui :

Tangential component of impeller inlet relative velocity

\(\bar W\) :

Average relative velocity

Z:

Number of blades

α:

Absolute flow angle from tangential direction

β:

Relative flow angle from tangential direction

β2o,b :

Impeller exit blade angle at second stage

ΔH:

Total head change

Δp o :

Total pressure change

Δp s :

Static pressure change

ηo :

Total efficiency=ΔpoQ/Pin

ρ:

Fluid density

ΣΔH L :

Summation of total head loss

φ:

Flow coefficient=Q/ (U 2oD2o L

ψo :

Total pressure coefficient=Δpo/(0.5ρU2 20)

ψs :

Static pressurecoefficient=Δps/(0.5ρU2 20)

ω:

Impeller rotational speed

Euler :

Euler work

enl :

Enlargement

exit :

Scroll casing exit

exp :

Expansion

id :

Ideal condition

inc :

Incidence

m :

Meridional direction

sc :

Scroll casing

sf :

Skin friction

th :

Throat of scroll casing

U :

Tangential direction

vsf :

Skin friction in scroll casing

1i :

First stage inlet

lo :

First stage outlet

2i :

Second stage inlet

2o :

Second stage outlet

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Authors and Affiliations

  1. Department of Mechanical Engineering, Sunmoon University, Asan City, Chung Nam, Korea

    Jae Won Kim

  2. Department of Mechanical Engineering, Chungju National University, Chungju, Chungbuk, Korea

    Hyoung Woo Oh

Authors
  1. Jae Won Kim
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  2. Hyoung Woo Oh
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Correspondence to Jae Won Kim.

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Kim, J.W., Oh, H.W. Mean streamline analysis for performance prediction of cross-flow fans. KSME International Journal 18, 1428–1434 (2004). https://doi.org/10.1007/BF02984256

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  • DOI: https://doi.org/10.1007/BF02984256

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