Influence of the Sweep Stacking on the Performance of an Axial Fan

Ilikan, Ayhan Nazmi; Ayder, Erkan

doi:10.1115/1.4028767

Cited by 15 publications

(3 citation statements)

References 16 publications

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“…The second is due to inevitable errors in both the numerical simulation and the experimental test. The deviation between the calculated and experimental data is lower than 5%, which is acceptable according to previous studies [18][19][20][21]. The total grid quantity selected eventually reaches approximately 11.02 × 10 6 .…”

Section: Grid Independencesupporting

confidence: 82%

Multi-Objective Optimization for the Radial Bending and Twisting Law of Axial Fan Blades

et al. 2022

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The performance of low-pressure axial flow fans is directly affected by the three-dimensional bending and twisting of the blades. A new blade design method is adopted in this work, where the radial distribution of blade angle and blade bending angle is composed of standard-form rational quadratic Bézier curves. Dendrite Net is then trained to predict the pneumatic performance of the fan. A non dominated sorting genetic algorithm is employed to solve the global optimization problem of the total pressure coefficient and efficiency. The simulation results show that the optimal blade load distribution along the radial direction becomes uniform, and the suction surface separation vortex and passage vortex are restrained. On the other hand, the tip leakage vortex is enhanced and moves toward the blade leading edge. According to the experimental results, the maximum efficiency increases by 5.44%, and the maximum total pressure coefficient increases by 2.47% after optimization.

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Section: Grid Independencesupporting

confidence: 82%

Multi-Objective Optimization for the Radial Bending and Twisting Law of Axial Fan Blades

et al. 2022

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“…Gümmer et al (2000) studied sweep and dihedral effects in axial compressor stators and demonstrated that positive sweep and positive dihedral could reduce end wall losses and increase operating range on compressors. Ilikan et al (2015) found that forward sweep and backward sweep do not significantly affect aerodynamic performance of a fan at the design flow rate in spite of the occurring modifications of the local blade pressure distribution. However, at low flow rate, forward sweep and backward sweep have positive and negative effects on the fan performance, respectively.…”

Section: Introductionmentioning

confidence: 93%

The Influence of Backward Sweep on Aerodynamic Performance of a 1.5-Stage Highly Loaded Axial Compressor

Huang¹,

Yang²,

Wang³

et al. 2019

Proceedings of Global Power &Amp; Propulsion Society

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As a degree of freedom in three-dimensional blade design of axial compressor, the sweep technique significantly affects aerodynamic performance of axial compressors. In this paper, the influence of backward sweep rotor configurations on aerodynamic performance of a 1.5-stage highly loaded axial compressor is studied by numerical simulation. The aim of this work is to improve understanding of flow mechanism of backward sweep on aerodynamic performance of a highly loaded axial compressor. A commercial CFD package is employed for flow simulations and analysis. The study found that backward sweep had little effect on peak efficiency of the 1.5-stage axial compressor. At the design rotational speed, compared with baseline, backward sweep rotor configurations reduce the blade loading near the leading edge but slightly increases the blade loading near the trailing edge in the hub region. As the degree of backward sweep increases, total pressure ratio and stall margin of the 1.5-stage axial compressor increase first and then decrease. Among different backward sweep rotor configurations, the 10% backward sweep rotor configuration has the highest stall margin, which is about 2.5% higher than that of baseline. This is due to the change of downstream stator incidence, which improves flow capacity near the hub region. At 60% rotational design speed, passage shock disappears. Backward sweep rotor configurations deteriorate stall margin of the compressor, but increase total pressure ratio and adiabatic efficiency when flow rate is lower than that at peak efficiency condition. Therefore, it's necessary to consider flow field structure of axial compressors in the design process and use the design freedom of sweep to improve the aerodynamic performance.

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“…Other geometrical considerations such as low hub-to-tip ratios have been accurately predicted using careful turbulence modeling, boundary conditions, trailing edge shape, and areas of non-aerodynamic shape sections at low rotational speeds. 20 Nazmi Ilikan and Ayder, 21 CFD is used as a tool to determine the effects of backward sweep and forward sweep angles in blade design; moreover, it was determined that forward sweep performed better at low rotational speeds but backward sweep fans' performance deteriorated.…”

Section: Introductionmentioning

confidence: 99%

The best efficiency point of an axial fan at low-pressure conditions

Corona

Mesalhy

Chow

et al. 2021

Advances in Mechanical Engineering

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In the current work, the objective is to determine the best efficiency point (BEP) of an axial fan using CFD. Analyzing the performance of the fan based upon the parameters chosen can lead to the optimal design of an axial flow fan for aerospace applications where the ambient pressure varies rapidly. The 2-bladed fan chosen for the study is the Propimax 2L which is considered the base fan used for comparison of all the results of the work. The set of parameters tested were fan rotational speed, ambient pressure conditions, blade count, and the airfoil design. All the performance measures were based on overall fan efficiency. The results yield the following: an increased rotational speed led to higher efficiencies, the most efficient ambient pressure of which the fan can perform is 0.7 atm, a 5-bladed fan configuration produced the highest efficiency, and airfoil selection is critical for fan efficiency enhancements. The results demonstrated that at 0.7 atm the fan efficiency is the highest due to the changes in power consumption to the density effect. A key finding in the work is that higher blade counts do not necessarily lead to higher performing axial fans. A high cambered airfoil provided a higher flow rate at free delivery than that of the Propimax 2L design, but the rotorcraft airfoil did not yield favorable results. The analysis is focused on the fan design of cooling of the electromechanical actuators (EMAs).

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Influence of the Sweep Stacking on the Performance of an Axial Fan

Cited by 15 publications

References 16 publications

Multi-Objective Optimization for the Radial Bending and Twisting Law of Axial Fan Blades

Multi-Objective Optimization for the Radial Bending and Twisting Law of Axial Fan Blades

The Influence of Backward Sweep on Aerodynamic Performance of a 1.5-Stage Highly Loaded Axial Compressor

The best efficiency point of an axial fan at low-pressure conditions

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