Fig. 1. Geometry of original centrifugal fan.
Fig. 2. Schematics of centrifugal fan system.
Fig. 3. Geometry of 95D centrifugal fan.
Fig. 4. Y+ distribution of the rotating part.
Fig. 5. Computational domain.
Fig. 6. Validation of VFR for numerical scheme.
Fig. 7. Distribution of flow velocity vectors on crosssectional plane normal to x-axis for 95D model.
Fig. 8. Distribution of flow velocity vectors on crosssectional plane normal to y-axis for 95D model.
Fig. 10. Modified hub shape.
Fig. 11. Distribution of flow velocity vectors on crosssectional plane normal to y-axis.
Fig. 12. Comparison of (a)95D model & (b)modified model.
Fig. 14. Comparison of the scroll housing.
Fig. 15. Distribution of velocity on the cross-sectional plane normal to z-axis.
Fig. 16. Effect of enlarging cut-off clearance.[8]
Fig. 17. Fan performance tester.
Fig. 18. Comparison of measured P-Q curve & predicted VFR.
Fig. 19. Experiment setup for noise measurement.
Fig. 20. Comparison of original model & modified model.
Fig. 9. Distribution of velocity on cross-sectional plane normal to z-axis for 95D model.
Fig. 13. Distribution of velocity vectors on the crosssectional plane normal to x-axis.
Table 1. Design constraint of target centrifugal fan unit.
Table 2. Result of numerical analysis.
Table 3. Comparison of projected area ratio.
Table 4. Comparison of the normalized cut-off clearance.
Table 5. Result of numerical analysis.
Table 6. Measurement equipment.
참고문헌
- D. Shin, S. Ryu, C. Cheong, T. Kim, and J. Jung, "Development of high performance-/low-noise centrifugal fan circulating cold air inside a household refrigerator by reduction of vortex flow," Trans. KSNVE, 26, 428-435 (2016). https://doi.org/10.5050/KSNVE.2016.26.4.428
- S. Lee, S. Heo, and C. Cheong, "Prediction and reduction of internal blade-passing frequency noise of the centrifugal fan in a refrigerator," Int. J. Refrigeration, 33, 1129-1141 (2010). https://doi.org/10.1016/j.ijrefrig.2010.03.006
- S. Heo, D. Kim, C. Cheong, and T. Kim, "Prediction of internal broadband noise of a centrifugal fan using stochastic turbulent synthetic model," Trans. KSNVE, 21, 1138-1145 (2011). https://doi.org/10.5050/KSNVE.2011.21.12.1138
- S. Heo, D. Kim, and C. Cheong, "Analysis of relative contributions of tonal noise sources in volute tongue region of a centrifugal" (in Korean), J. Acoust. Soc. Kr. 33, 40-47 (2014). https://doi.org/10.7776/ASK.2014.33.1.040
- S. Heo, C. Cheong, and T. Kim, "Development of low-noise centrifugal fans for a refrigerator using inclined S-shaped trailing edge," Int. J. Refrigeration, 34, 2076-2091 (2011). https://doi.org/10.1016/j.ijrefrig.2011.07.003
- M. Sanjose and S. Moreau, "Direct noise prediction and control of an installed large low-speed radial fan," European J. Mechanics B/Fluids, 61, 235-243 (2016).
- R. Jorgensen, Fan engineering (Howden Buffalo, Inc, New York, 1999), pp. 10.1-10.17.
- W. Neise, "Noise reduction in centrifugal fans: a literature survey," J. Sound and Vibration, 45, 375-403 (1976). https://doi.org/10.1016/0022-460X(76)90394-1