The Vortex Fan is a Cost-Effective Alternative to Traditional Fans

The Vortex Fan is a Cost-Effective Alternative to Traditional Fans

A vortex fan is a small, bladeless fan that sucks up air and distributes it downward in a spiral, similar to a natural tornado.vortex fan It can be used to ventilate rooms during remodeling, new construction or flood restoration. The duct-free system is powered by electricity and has a remote control for easy operation. It is available in multiple sizes and can be a cost-effective alternative to traditional fans.

In a smoke experiment, the appearance of a symmetric vortex at the fan outlet prompted researchers to study its generation process and explore effective suppression methods.vortex fan To do so, the multiblade centrifugal fan was divided into several sections and its velocity vector diagrams were intercepted to observe the flow situation in each section. The results showed that the section located near the volute tongue (S90) has two vortices, one of which is caused by the low-speed eddies at the step between the inlet and the impeller and the other by the flow inertia as the impeller rotates 90 degrees and flows into the volute.

The dual-inlet fan has a narrower volume of the volute tongue than the single-inlet fan.vortex fan Thus, it has a vortex structure that has a symmetric distribution with the single-inlet fan, implying a similar effect on its performance. To better understand this, the dual-inlet multiblade centrifugal fan was modeled with its velocity vector diagrams and temperature distributions.

Based on the velocity vector diagrams and temperature profiles, it can be seen that there are two obvious vortices downstream of the fan: a jet flow and a triangular-like vortex ring.vortex fan The symmetry of these two features is due to the structural similarities between the dual-inlet and single-inlet multiblade centrifugal fans.

Moreover, the results of the investigation show that the installation of the fairing sheet increases the number of vortices in the volute outlet while decreasing their intensity.vortex fan This reduces the broadband noise and improves the static pressure efficiency of the fan under different working conditions.

The research results suggest that the addition of the fairing sheet in the multiblade centrifugal fan can effectively suppress the symmetric vortex at the fan outlet and significantly increase its performance. Besides, it can also reduce the noise generated by the fan, which is an important issue in industrial application.

Enhanced fan efficiency can result in significant parasitic power reductions for air-cooled condensers in power plants. This can help to minimize the impact of climate change and save energy costs. To achieve this goal, it is necessary to develop a method for manipulating the tip leakage flow in the axial fan. Previous studies have shown that modifying the blade-tip vortex can increase the blade-to-air momentum transfer and stabilize the flow structures as it traverses the fan. However, these previous studies have not been applied to a direct dry-cooled ACC fan. Therefore, this research investigates the effectiveness of a fairing sheet in the multiblade centrifugal ACC fan to reduce the tip leakage vortex and enhance its efficiency.

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