Airfoil fan how does it work

Fan Types - Why choose an Axial fan Follow article. FanManDan 15 Dec How does an axial fan work? Aircraft Fan In the case of a fan we use an impeller blade like an aerofoil however instead of generating lift we keep the fan blades rotating in a stable axis and this creates airflow.

Reduction in the effective diameter using alternative mounting methods Fan characteristic The optimum operating area on an axial fan characteristic is below what is called the stall dip.

The graph below illustrates the optimum working area… The volume flow is plotted along the X-axis and the system pressure is plotted on the Y-axis.

Mounting considerations — c learances When installing an axial fan, it is important to consider several factors relating to how it is mounted to the application. For an axial fan of mm diameter, there should be at least mm of clearance between the fan and an obstruction to flow Coil, Filter, wall etc… Mounting considerations — p osition of the fan in the system The position of an axial fan in the application will affect its operating conditions. In the example below the choice for cooling an enclosure containing electronics dissipating a heat load is shown… As mentioned above, the components of an axial fan are designed to promote a smooth laminar flow of air on to the impeller blade.

Summary — why choose an axial fan? Share this post. Like Follow article. FanManDan Follow. When it comes to acquiring and passing on knowledge, I try to keep it as simple and as least painful as possible.

I am happy to receive feedback and if there are any questions that arise from anything that gets published. If I don't know the answer to your question immediately, I am sure that I know someone that can help. Comments Add a comment Rajat October 3, Upvote 1 Votes Downvotes. July 15, August 27, September 14, DesignSpark Electrical Logo linkedin.

Size the enclosure air inlet and exit vents at least as large as theventuri opening of the fan used. Locate components with the most critical temperature sensitivitynearest to inlet air to provide the coolest air flow. The following previous articles in Electronics Cooling are relevantto this article. Ellison, Gordon, N. Your email address will not be published. Types of Fans and Blowers Air moving devices are generally described as being either a type of fan Fig.

Figure 1 a : A typical fan Figure 1 b : A typical blower There are several types of fans, some of the most common being propeller,tube axial and vane axial styles. Basic Aerodynamics Fans are of such common use that a basic understanding of the aerodynamicsis appropriate. The Fan Curve All of the aerodynamic aspects of a fan are exhibited in a fan curve such asis shown in Figure 3. Steps to Fan Selection Estimate the required airflow Before selecting a fan, obtain as accurate an estimate as possible of theheat to be dissipated, because the overall system air temperature differentialabove the inlet ambient is directly proportional to the heat dissipated.

Estimate the actual airflow The preceding steps indicated the necessary procedure to estimate the required airflow in order to obtain the desired overall air temperature rise T.

Consider multiple fans Combining fans in series or parallel can sometimes achieve the desiredairflow without greatly increasing the system package size or fan diameter. The Fan Laws Sometimes it may be necessary to determine the output of a given fan underother conditions of speed or density, or to convert the known performance of anair mover of one size to that of another geometrically similar unit of adifferent size.

The following comments should also be kept in mind with regard to fanlocation: 1. Locate components with highest heat dissipation near the enclosure airexits. Avoid hot spots by spot cooling with a small fan. Blow air into cabinet to keep dust out, i. Use the largest filter possible, in order to: a. Increase dust capacity b. Reduce pressure drop. Figure 4: Cabinet Cooling Hints References 1. Mike Turner. Next Post » An introduction to thermoelectric coolers.

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Diameter D Density. Speed N Density. Of these, the forward curve, backward curve, airfoil fans, and radial fans are the most popular ones. Centrifugal fans are named so owing to their airfoil-profiled blades. Airfoil fans are used in applications where ambient or elevated temperatures are involved such as chemical, power generation, metals, resource recovery industries, and so on.

These fans assure high efficiency as well as quiet operations. Dust buildup is one of the drawbacks of this fan. Thus, they are more appropriate for clean air applications. These fans have squirrel cage impellers, which generate the highest airflow volume. Forward curve fans are most commonly used in high-temperature furnace applications, and ventilation applications where there is a low chance of dust loading.

This fan requires a large number of blades to drive forward curve wheels. This is why they cannot be used in applications where there is a chance for high dust loading. If dust settles on blades, then the volume of air supply will be impacted. These fans possess the same efficiencies as airfoil fans. They have curved plate blades, which can help avoid the possibility of dust buildup. This specific design makes them suitable for high-pressure applications. The following design characteristics make them superior to the above-discussed fans.

Impellers of these fans can be availed in various designs. You will find more variations in impellers than airfoil, forward curve, and backward curve fans. Some popular types include:. When compared to the airfoil, backward curve, and forward curve centrifugal fans, the radial fans are medium airflow fans. Owing to their high-pressure and non-dust build up designs, these fans are widely used in challenging industrial applications like mining facilities to move air at high pressure.

Radial fans or radial blade fans possess one of the most robust structural designs in the field. The 4Z, 5Z and 6W blades each can be tailored as an engine cooling fan , a condenser fan , a radiator fan or an oil cooler fan. In fact, select airfoil fans have the narrow axial depth necessary to provide the required cooling performance in the tight engine compartments that result from Tier IV.

Hub Diameters. Impeller Materials.