Utjecaj radijalnog i aksijalnog razrmaka na emitiranu buku i performance ventilatora

  • Mirko Čudina

Abstract

Among all auxilimy units of the air cooled diesel engine acooling fan is the noisiest. One of the noise generation mechanismsis the blade interaction with the vortices occurring in theradial and axial clearances of the fan due to the pressure differencebetween the pressure and suction side of the rotorblade. This mechanism of noise generation is especially distinctif the fan is operating in a heavily loaded condition, i.e.,at partial flow rate, when the pressure differences are greater._In this paper the effects of radial and axial clearances betweenthe rotor and stator of the fan on the emitted noise and performances of the fan will be presented and discussed. The experimentalresults have shown that the radial and axial clearancehave its optimum with regard to the best value of emittednoise, performances, dimensions and technology of productionof the fan.

References

[I] M. CUDINA: Mehanizmi generiranja buke kod ventilatora

za hladenje motora s unutamjim izgaranjem. Promet,

vol. 7, 1995, br. 4, str. 89-93.

M. CUDINA: Flow Instabilities and Noise Generation in

Vane Axial Fans due to Rotating Stall and Surge. SAE International

Off-Highway Powerplant Congress & Exposition,

Milwaukee, USA, September 1995, Paper No.

M. CUDINA: Noise Generated by a Vane-Axial Fan with

Inlet Guide Vanes. Noise Control Engineering Journal,

Vol. 39/1, 7-8, 1992, pp. 21-30.

M. J. LIGHTHILL: On Sound Generated Aerodynamically,

General Theory. Proceedings of the Royal Society

of London, 1952, Vol. A211, pp. 564-587.

R. E. LONGHOUSE: Control of Tip-Vortex Noise of

Axial Flow Fans by Rotating Shrouds. Journal of Sound

and Vibration (1978) 58 (2), pp. 201-214.

R. E. LONGHOUSE: Noise Mechanism Separation and

Design Considerations for Low Tip-Speed, Axial-Flow

Fans. Journal of Sound and Vibration (1976) 48 (4), pp.

-474.

K. B. WASHBURN, G. C. LAUCHLE: Inlet Flow Conditions

and Tonal Sound Radiation from a Subsonic Fan.

Noise Control Engineering Journal (1988) 31 (2), pp. 101-

-110.

I. j. SHARLAND: Sources of Noise in Axial Flow Fans.

Journal of Sound and Vibration (1964) I (3), pp. 302-322.

W. NEISE: Fan Noise - Generation Mechanisms and

Control Methods. Proceedings of the INTER NOISE 88,

Avignon, France, 1988, pp. 767-776.

L. M. GRAY: A. Review of the Physics and Aerodynamics

with a View Toward Noise Control. Proceedings of

the NOISE-CON 83, Cambridge Massachusetts, 1983, pp.

-196.

How to Cite
1.
Čudina M. Utjecaj radijalnog i aksijalnog razrmaka na emitiranu buku i performance ventilatora. PROMET [Internet]. 1 [cited 2020Oct.31];8(4-5):153-8. Available from: http://traffic.fpz.hr/index.php/PROMTT/article/view/833
Section
Older issues