Axial flow fans are broadly applied in numerous industrial applications because of their simplicity, compactness and moderately low cost, such us propulsion machines and cooling systems. Computational fluid dynamics techniques are commonly applied to investigate flow phenomena through the axial fan and the rotor dynamic performance. In the present work, a computational model of an axial fan is presented in the current study. Numerical simulations of a single stage axial fan on variable conditions have been performed to obtain the detailed flow field of the centrifugal fan. The investigation of the current work is focused on the rotor-stator configuration and the modeling of aerodynamic behavior of the blade rows. The precise prediction of axial force and efficiency has essential implication for the optimized operation of axial fan and the choice of thrust bearing. Furthermore, it can act as guide for the geometrical and structural axial fan design and the study of axial force prediction.

In this paper, numerical analyses on a concentrated solar receiver (CSR) pipes have been performed. The fluid is considered to be superheated steam phase. The pressure drops and temperature distribution in the absorber tubes of the parabolic-trough solar collector (PSC) have been explored in detail. In the numerical studies, the experimental data received from the solar test facility located at the Plataforma Solar de Almeria, Spain has been used for the real world application in order to shed a light on the superheated phase of the plant. The RNG k-ε turbulence model is considered for the CFD analyses. In the explorations, especially the fluid behavior at different mass flows have been taken into account. The process has been evaluated for different temperate T and pressure P cases such as Case 1: P = 3.21 MPa, T = 240.4 °C and Case 2: P = 10 MPa, T = 500 °C. According to the results, the numerical results have been in good agreement within the error rate of 0.79 % for the experimental temperature measurements. Therefore, the proposed numerical technique can be generalized for different steam parameters in order to estimate the steam characterization for the experimental facility.

In this study, flow phenomena through the axial fan and the rotor dynamic performance analysis of a permanent magnet generator with three phases has been explored for a wide velocity range by using an Ansys-Fluent computational fluid dynamics package. In this respect, velocities of dependence angle for a flat blade have been analyzed, numerically. The self-sustained air cooling performance has been optimized in order to provide more efficient machine, namely the number of blades and blade angles have been considered as different input parameters in the simulations. As a result of simulations, the optimum flat angle of the blade is determined after having the highest velocity value from the outlet of the simulation. Besides, the rotor fan power is obtained from the pressure differences between the inlet and outlet. According to the results, the highest velocity has been predicted as 1.86 m/s and power has been calculated as 0.48 W at 65 degrees of blade. In addition, the optimum number of blade has been ascertained as 40 and the velocity for this blade geometry has been found as 1.39 m/s. Consequently, the optimum rotor blade angle and number have been determined as 65 degrees and 40, respectively.