Design and flow investigation of an axial fan used in automotive cooling systems with the GEKO turbulence model
Küçük Resim Yok
Tarih
2024
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Ege Üniversitesi, Fen Bilimleri Enstitüsü
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
In this thesis, the design, numerical analysis and verification for an axial cooling fan in automotive sector has been has been carried out. The first phase of the design problem was the determination of design parameters like pressure difference and volumetric flow rate. Then the geometry was split into sections and each the airfoil for every section was created carefully using mathematical equations and cascade analyses. While running the cascade analyses, different turbulence models had been compared. Generalized $k-\omega$ turbulence model (GEKO) was focused on. The next phase for design was connecting the airfoil sections verified with cascade analyses. The sections were connected using a sweep method that would satisfy the fan noise and efficiency needs. After the geometry was prepared, analyses with rotational periodicity were done on the axial fan. The last phase for design was the comparison between cascade analyses and analyses with rotational periodicity; and the validation of these analyses with rotational periodicity using experimental results of a wind tunnel experimentation. At the end of this study, an original automotive cooling fan on design point of flow coefficient 0.0495 and pressure coefficient 0.0364 has been attained.
In this thesis, the design, numerical analysis and verification for an axial cooling fan in automotive sector has been has been carried out. The first phase of the design problem was the determination of design parameters like pressure difference and volumetric flow rate. Then the geometry was split into sections and each the airfoil for every section was created carefully using mathematical equations and cascade analyses. While running the cascade analyses, different turbulence models had been compared. Generalized $k-\omega$ turbulence model (GEKO) was focused on. The next phase for design was connecting the airfoil sections verified with cascade analyses. The sections were connected using a sweep method that would satisfy the fan noise and efficiency needs. After the geometry was prepared, analyses with rotational periodicity were done on the axial fan. The last phase for design was the comparison between cascade analyses and analyses with rotational periodicity; and the validation of these analyses with rotational periodicity using experimental results of a wind tunnel experimentation. At the end of this study, an original automotive cooling fan on design point of flow coefficient 0.0495 and pressure coefficient 0.0364 has been attained. After carefully considering the free parameters of GEKO, the free parameter with the most effect on both 2D cascade analyses and 3D analyses with rotational periodicity was decided to be Flow Separation Free Parameter CSEP. Other free parameters were found to have little effect on the analyses, therefore could be ignored compared to the effect CSEP had.
In this thesis, the design, numerical analysis and verification for an axial cooling fan in automotive sector has been has been carried out. The first phase of the design problem was the determination of design parameters like pressure difference and volumetric flow rate. Then the geometry was split into sections and each the airfoil for every section was created carefully using mathematical equations and cascade analyses. While running the cascade analyses, different turbulence models had been compared. Generalized $k-\omega$ turbulence model (GEKO) was focused on. The next phase for design was connecting the airfoil sections verified with cascade analyses. The sections were connected using a sweep method that would satisfy the fan noise and efficiency needs. After the geometry was prepared, analyses with rotational periodicity were done on the axial fan. The last phase for design was the comparison between cascade analyses and analyses with rotational periodicity; and the validation of these analyses with rotational periodicity using experimental results of a wind tunnel experimentation. At the end of this study, an original automotive cooling fan on design point of flow coefficient 0.0495 and pressure coefficient 0.0364 has been attained. After carefully considering the free parameters of GEKO, the free parameter with the most effect on both 2D cascade analyses and 3D analyses with rotational periodicity was decided to be Flow Separation Free Parameter CSEP. Other free parameters were found to have little effect on the analyses, therefore could be ignored compared to the effect CSEP had.
Açıklama
Anahtar Kelimeler
GEKO, Türbülans Modeli, Hesaplamalı Akışkanlar Dinamiği, Fanlar, Eksenel Fanlar, Otomotiv., Turbulence Model, Computational Fluid Dynamics, Fans, Axial Fans, Automotive
