Numerical modeling of aeroacoustic characteristics of different savonius blade profiles

Abstract

<jats:sec> <jats:title content-type="abstract-subheading">Purpose</jats:title> <jats:p>This study aims to carry out numerical modeling to predict aerodynamic noise radiation from four different Savonius rotor blade profile.</jats:p> </jats:sec> <jats:sec> <jats:title content-type="abstract-subheading">Design/methodology/approach</jats:title> <jats:p>Incompressible unsteady reynolds-averaged navier-stokes (URANS) approach using gamma–theta turbulence model is conducted to obtain the time accurate turbulent flow field. The Ffowcs Williams and Hawkings (FW-H) acoustic analogy formulation is used for noise predictions at optimal tip speed ratio (TSR).</jats:p> </jats:sec> <jats:sec> <jats:title content-type="abstract-subheading">Findings</jats:title> <jats:p>The mean torque and power coefficients are compared with the experimental data and acceptable agreement is observed. The total and Mono+Dipole noise graphs are presented. A discrete tonal component at low frequencies in all graphs is attributed to the blade passing frequency at the given TSR. According to the noise prediction results, Bach type rotor has the lowest level of noise emission. The effect of TSR on the noise level from the Bach rotor is investigated. A direct relation between angular velocity and the noise emission is found.</jats:p> </jats:sec> <jats:sec> <jats:title content-type="abstract-subheading">Practical implications</jats:title> <jats:p>The savonius rotor is a type of vertical axis wind turbines suited for mounting in the vicinity of residential areas. Also, wind turbines wherein operation are efficient sources of tonal and broadband noises and affect the inhabitable environment adversely. Therefore, the acoustic pollution assessment is essential for the installation of wind turbines in residential areas.</jats:p> </jats:sec> <jats:sec> <jats:title content-type="abstract-subheading">Originality/value</jats:title> <jats:p>This study aims to investigate the radiated noise level of four common Savonius rotor blade profiles, namely, Bach type, Benesh type, semi-elliptic and conventional. As stated above, numbers of studies exploit the URANS method coupled with the FW-H analogy to predict the aeroacoustics behavior of wind turbines. Therefore, this approach is chosen in this research to deal with the aeroacoustics and aerodynamic calculation of the flow field around the aforementioned Savonius blade profiles. The effect of optimal TSR on the emitted noise and the contribution of thickness, loading and quadrupole sources are of interest in this study.</jats:p> </jats:sec>

Pengaruh Jumlah Sudu Terhadap Performa Hidro-Turbin Savonius Sebagai Alternatif Desain Pengolahan EBT

“…Penelitian yang telah dilakukan adalah memberikan modifikasi pada bentuk geometri rotor. Beberapa faktor geometri yang dimodifikasi antara lain jumlah sudu [12], overlap rasio [13], Multi-stage [14], Aspek Ratio [15], bentuk sudu [16][17][18], bahan material [19][20], dan beberapa penambahan elemen lain [21][22][23]. Mahmoud telah melakukan modifikasi terhadap Jumlah sudu (2, 3, and 4) dengan variasi overlap rasio mengasilkan Cpmax terbaik diperoleh pada turbin savonius duasudu pada seluruh variasi overlap [13].…”

“…Delbari melakukan modifikasi terhadap profile Sudu,pada penelitiannya dilakukan dengan variasi bebrapa bentuk profile sudu yang berbeda. Profile sudu itu adalah semi-elliptic, dan Bach Benesh [16]. Penelitian lain melakukan modifikasi yaitu menambahkan Sudu tandem,hasil dari modifikasinya menghasilkan Cpmax sebesar 0.19 menunjukan nilai yang lebih tinggi dari Savonius konvensional [18].…”

Review of Specific Performance Parameters of Vertical Wind Turbine Rotors Based on the SAVONIUS Type

“…Energies 2021, 14,1962 2 of 23 All these advantages encourage studies aimed at constructive and functional optimization that can ensure increased operation performance for this rotor type. To achieve this goal, multiple studies and research activities have been conducted in which researchers used both numerical [15][16][17][18][19][20][21][22][23] and experimental methods [24][25][26][27][28][29][30][31][32][33][34][35] to establish and improve the performance of rotor construction variants directed towards blade shape optimization or determination of the optimal rotor blade number [36][37][38][39]. Additionally, the studies aimed to establish the optimum values related to the aspect ratio [40][41][42][43], and the overlap ratio [44][45][46][47][48][49], and to change the performance parameters in the case of end plates [50], and curtains mounted to the rotor assembly [51][52][53][54][55], with the scope of directing the air stream to the active blade, thereby avoiding the negative mom...…”

Influence of Narrow Rectangular Channel ( AR = 1 : 4 ) on Heat Transfer and Friction for V- and W-Shaped Ribs in Turbine Blade Applications

“…With better arrangement of turbulators, higher heat transfer can be generated at relatively lesser flow rates. Delbari et al [20] studied different blade profiles and established that the turbine blade aspect ratio is one of the important operational parameter, and the performance and fuel consumption depend largely on the geometry of the blade profile. Pordanjani et al [21] brought out that many engineering applications employ the principles of convection inside cavities.…”