Aeroacoustic Characteristics of Efficient Automotive Engine Cooling Fan Systems

Volume 1 ◽

10.1115/ht-fed2004-56824 ◽

2004 ◽

Cited By ~ 2

Author(s):

S. Moreau ◽

F. Bakir

Keyword(s):

Test Facility ◽

Flow Conditions ◽

Efficiency Gains ◽

Flow Rates ◽

Automotive Engine ◽

Engine Cooling ◽

Cooling Fan ◽

Percentage Points ◽

Additional Noise ◽

Definition Of

Recent studies on automotive engine cooling fan systems carried out in partnership between LEMFI and Valeo have led to the definition of a range of efficient stator designs. It was shown that an adequate rotor-stator coupling could yield significant efficiency gains over the whole range of Valeo fans with diameters ranging from 280 mm to 460 mm. Efficiency gains ranging from 12 percentage points for the 350 mm fan diameter to 2 points for the 460 mm were estimated by using a simplified radial equilibrium design (SRE). These predictions have been verified experimentally by recent designs for various fan system diameters. The present study then describes a newly developed aeroacoustic test facility dedicated to automotive fan systems. The influence of the rotor-stator coupling is then shown by comparing the rotor alone and rotor-stator configurations, not only on the overall performances and velocity fields at the system outlet measured by a 5-hole probe, but also on the noise generated by the fan systems for various flow conditions. At the nominal flow rate, the efficient stators are shown to bring little or no extra noise if the number of stators and the rotor-distance are carefully chosen. At other flow rates, additional noise might be expected.

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Application of acoustic analogy to automotive engine-cooling fan noise prediction

AIAA Journal ◽

10.2514/3.14521 ◽

2000 ◽

Vol 38 ◽

pp. 1095-1098 ◽

Cited By ~ 1

Author(s):

Jeonghan Lee ◽

Kyungseok Cho ◽

Soogab Lee

Keyword(s):

Noise Prediction ◽

Acoustic Analogy ◽

Fan Noise ◽

Automotive Engine ◽

Engine Cooling ◽

Cooling Fan

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LARGE-SCALE LES ANALYSIS OF AUTOMOTIVE ENGINE COOLING FAN

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016) ◽

10.7712/100016.1887.8074 ◽

2016 ◽

Author(s):

Yuji Kobayashi ◽

Kenji Yoshida ◽

Itsuhei Kohri ◽

Masaharu Sakai ◽

Hideo Asano

Keyword(s):

Large Scale ◽

Automotive Engine ◽

Engine Cooling ◽

Cooling Fan

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Detailed Study of an Efficient Small Diameter Automotive Engine Cooling Fan System

Volume 2: Symposia, Parts A, B, and C ◽

10.1115/fedsm2003-45117 ◽

2003 ◽

Cited By ~ 4

Author(s):

S. Moreau ◽

F. Bakir

Keyword(s):

Small Diameter ◽

Rapid Prototype ◽

Efficiency Improvement ◽

Test Rig ◽

Cfd Simulations ◽

Automotive Engine ◽

Engine Cooling ◽

Cooling Fan ◽

Radial Equilibrium

This paper deals with stator efficiency improvement meant for automotive engine cooling fan systems. A new rapid prototype of a long stator designed for a small diameter Valeo rotor (320 mm) has been manufactured and tested on a recently designed Valeo-LEMFI test rig. The following points are presented: • Overall performances of the 320 mm rotor alone. • Overall performances of the 320 mm rotor combined with the new long stator vanes: this study confirms the gain of efficiency foreseen previously with the simplified radial equilibrium code VENTAX. • Steady velocities measured 41 mm downstream of the stage configuration: These measurements obtained by using a 5-hole probe show high deflection carried out by the stators with long chord lengths. Comparisons with preliminary CFD simulations are also shown for both the overall performances and the local velocities.

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Efficient Stator Design for Automotive Engine Cooling Fan Systems

Volume 1: Fora, Parts A and B ◽

10.1115/fedsm2002-31318 ◽

2002 ◽

Cited By ~ 3

Author(s):

F. Bakir ◽

S. Moreau

Keyword(s):

Efficiency Improvement ◽

Test Rig ◽

Automotive Engine ◽

Engine Cooling ◽

Cooling Fan ◽

Stator Design ◽

Radial Equilibrium

This paper deals with stator efficiency improvement meant for automotive engine cooling fan systems. Four stators designed for a Valeo 380 mm rotor were manufactured and tested on a newly designed Valeo-Lemfi test rig. The following points are presented: • Overall performances of the 380 mm rotor. • Overall performances of the 380 mm rotor combined with a short chord stator. Inefficiency of such a design is shown: Slight deflection carried out by the stator is the cause of the slight gain of efficiency. • Overall performances of the 380 mm rotor combined to three long chord stators: this study confirms the gain of efficiency foreseen previously with the simplified radial equilibrium code VENTAX. • Steady velocities measured 33 mm downstream the various stage configurations: These measurements obtained by using a 5-holes probe show high deflection carried out by the long chord stators.

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An LDV Study of the Influence of the Radiator on a Cooling Module Fan

Volume 1: Fora, Parts A and B ◽

10.1115/fedsm2002-31426 ◽

2002 ◽

Author(s):

Robert J. Martinuzzi ◽

Gregory A. Kopp ◽

Brian Havel

Keyword(s):

Laser Doppler Velocimetry ◽

Reverse Flow ◽

Low Flow ◽

Doppler Velocimetry ◽

Flow Conditions ◽

Flow Rates ◽

Cooling Fan ◽

Outlet Flow ◽

Flow Through ◽

Cooling Module

The influence of the radiator on the flow through an automotive cooling fan module was investigated using Laser Doppler Velocimetry for three different flow conditions. It is found that at the nominal design point, the radiator acts as an effective flow straightener. At low flow rates, fan induced pre-swirl is significant, but the radiator helps reduce reverse flow through the fan. Under ram air conditions the upstream inlet distortions persist through the module resulting in a highly distorted outlet flow.

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