Axial fan

An axial fan is a type of fan that causes gas to flow through it in an axial direction, parallel to the shaft about which the blades rotate. The flow is axial at entry and exit. The fan is designed to produce a pressure difference, and hence forceto cause a flow through the fan. Factors which determine the performance of the fan include the number and shape of the blades.

Fans have many applications including in wind tunnels and cooling towers. Design parameters include powerflow ratepressure rise and efficiency. Axial fans generally comprise fewer blades two to six than ducted fans. Since the calculation cannot be done using the inlet and outlet velocity triangleswhich is not the case in other turbomachinescalculation is done by considering a mean velocity triangle for flow only through an infinitesimal blade element.

The blade is divided into many small elements and various parameters are determined separately for each element. In the figure, the thickness of the propeller disc is assumed to be negligible. The boundary between the fluid in motion and fluid at rest is shown. Therefore, the flow is assumed to be taking place in an imaginary converging duct [1] [2] where:. In the figure, across the propeller disc, velocities C 1 and C 2 cannot change abruptly across the propeller disc as that will create a shockwave but the fan creates the pressure difference across the propeller disc.

On subtracting the above equations: [1]. Comparing this thrust with the axial thrust due to change in momentum of air flow, it is found that: [1]. A parameter 'a' is defined such that [1]. Hence the flow can be modeled where the air flows through an imaginary diverging duct, where diameter of propeller disc and diameter of the outlet are related.

In this theorya small element dr is taken at a distance r from the root of the blade and all the forces acting on the element are analysed to get a solution.

axial fan

It is assumed that the flow through each section of small radial thickness dr is assumed to be independent of the flow through other elements. Resolving Forces in the figure [1]. Also from the figure [1]. Therefore, [1]. Finally, thrust and torque can be found out for an elemental section as they are proportional to F x and F y respectively. The relationship between the pressure variation and the volume flow rate are important characteristics of fans.

The typical characteristics of axial fans can be studied from the performance curves. The performance curve for the axial fan is shown in the figure. The vertical line joining the maximum efficiency point is drawn which meets the Pressure curve at point "S" [1] The following can be inferred from the curve. Stalling and surging affects the fan performanceblades, as well as output and are thus undesirable. They occur because of the improper design, fan physical properties and are generally accompanied by noise generation.

The cause for this is the separation of the flow from the blade surfaces. This effect can be explained by the flow over an air foil. When the angle of incidence increases during the low velocity flow at the entrance of the air foil, flow pattern changes and separation occurs. This is the first stage of stalling and through this separation point the flow separates leading to the formation of vortices, back flow in the separated region.

For a further the explanation of stall acok best archers rotating stall, refer to compressor surge. The stall zone for the single axial fan and axial fans operated in parallel are shown in the figure. Many Axial fan failures have happened after controlled blade axial fans were locked in a fixed position and Variable Frequency Drives VFDs were installed.

The VFDs are not practical for some Axial fans. Axial fans with severe instability regions should not be operated at blades angles, rotational speeds, mass flow rates, and pressures that expose the fan to stall conditions.There are more industrial applications for fans than most people can even imagine. Where do you even start in order to learn the differences between types of fans? There are two main types of industrial fans. Differentiating between the two is easy once you understand how each type of fan works and what its benefits and limitations are.

The first and oldest option for an industrial fan is an axial fan. Axial fans have been around forever. These devices date back to the windmills designed by Persians in A. Engineers introduced the electrically powered fans to the public in the s. These electric fans had the same design as the Persian windmills — an axial fan. The fan is named for the direction of the airflow that it creates as it moves air. The blades that rotate around the axis pull air in parallel to the axis and force it out in the opposite direction — still parallel to the axis.

Imagine a ceiling fan. The fan draws air down from the ceiling, parallel to the axis, and forced straight down to the floor.

axial fan

They move air at a high flow rate, meaning that they can move a lot of air. However, the airflow is low pressure. Axial fans have a lot of uses, with most of them falling under the general purpose category.

High Efficient Inline Vane Axial Fan Impeller Type M – YFIAM

Consider one anytime you need to move a large volume of air from one place to another. Low-pressure, high-volume flow is great for cooling spaces, such as a home or office building. An axial fan is used in condenser cooling for a refrigeration system. It can also make a great exhaust fan.

Axial AC Fan Kits

As more technology is incorporated into everyday products, axial fans become more and more common. They are now used in vending machines to cool the computers that allow for cashless payment options.

axial fan

For non-ducted applications, this model is likely the solution you need for airflow.Axial Flow Fans or Industrial Axial Fans use a propeller to draw the air into the fan and discharge it in the same axial direction.

Axial fans are typically used for exhausting dirty air or fumes from processes such as paint spray boothssupplying fresh air, and general spot cooling of people, rooms or machinery. They are typically designed to handle large volumes of air at low pressure SP and are generally available in both direct driven models with the propeller mounted on the motor shaft, and belt driven models.

The materials used in the construction of industrial axial fans are typically mild steel. However, certain applications may require aluminum propellers or all aluminum for spark resistance, and stainless steel or coatings for chemical resistance. Certain applications may also require that the fan be belt driven with the motor outside the air stream and not subject to air stream conditions such as high temperatures, excessive dirt or caustic contaminants.

Additional Requirements Please attach any drawings or other information that may assist us. Contact your local Sales Engineer today.The outstanding features of axial fans are their small installation depth, low noise level and exceptional efficiency, and are particularly well suited for air flow through heat exchangers.

Furthermore, with GreenTech EC technology, the axial fan becomes a intelligent energy saver for an extremely wide range of applications. The axial fan, the function of which is similar to a propeller, moves the air axially, parallel to the revolving motor shaft. The ebm-papst external rotor motor is integrated directly into the axial impeller, forming a compact axial fan unit. Moreover, using GreenTech EC motors also enables precision control of the air flow — they are available with tacho output, linear or PWM input, bus-connectable interfaces and many other features.

They are usually installed with wall rings in short or long bell mouths. For one, a carrier made of aluminium provides high stability. For another, the attached sleeve made of fibreglass-reinforced plastic permits completely free mouldability of the blades.

For example, in earlyour product innovation received the iF material award iF International Forum Design GmbHthe renowned prize for outstanding material solutions.

This makes it particularly easy to switch to our lightweight fans. FlowGrid stands for efficient noise protection features in cooling, ventilation and air-conditioning technology. Kitts and Nevis St. Lucia St. The axial fan: One principle, countless options. FlowGrid - Air-inlet grille for axial fans. EC medium pressure. Unit cooler. Energy-saving iQ motors. Further information You need further information or have a question?

Product search. Air-inlet grille FlowGrid. Axial fans [PDF] GreenTech EC technology.For over years Howden has been engineering and manufacturing reliable axial fans for any application, whatever the size or pressures. We believe in our products, and in their capacity to provide long term, high value service. We are committed to maintaining and where possible enhancing their performance and extending their working life. We understand a key challenge that you face is increasing costs.

Howden make some of the biggest and most powerful axial fans in the world, but whatever size you need we have the fan to match. Jetstream Axial Mine Fans AMF Series are heavy-duty axial fans designed specifically for main mine ventilation These robust adjustable-pitch fans have been designed to deliver up to 1 million CFM against 14 inches total pressure.

Processes: Mine Ventilation. Axial fans are the end product of many years of fan development in our Howden American Fan Company engineering laboratories. They encompass design features derived from experience, techniques borrowed from Airbus design, computer simulation, and customer input. Axial fans are available in both direct drive and belt drive. AXICENT Variable Pitch Axial Fans provide higher pressures and volumes and can be supplied with or without guide vanes, contra-rotating and as truly reversible fans that provide the same flow in both the forward and reverse directions.

Processes: Tunnel Ventilation. Howden Donkin long cased axial flow fans perform under the toughest conditions. Contact us for details about the Hemax and BIL mining fans. State of the art highly efficient fans providing economy, low sound and excellent reliability as well as precision engineered high performance. The PF fan is a fully custom made design to order specification.

axial fan

It can be done as a single stage fan PFS range with one axial impeller or a two stage fan PFT range with two axial impellers. It can be either controlled via its precise and step less hydraulic blade pitch control system with very low hysteresis or using a Variable Frequency Drive with a fixed pitch PF fan.

Processes: Wind tunnels. A uniquely design for all mine ventilation applications both in coal mines and hard rock mines. The fans can be designed for reverse operation by counter rotation or by blade pitch regulation and can be designed to conform to ATEX standards. A uniquely designed axial fan providing operating economy, low sound power levels and reliability.

When reliability and adaptability are paramount, the Tellus fan is the preferred choice for the most demanding environments. The Tellus fan range can also be configured as an adjustable pitch axial fan upon request. Processes: Industrial Processes.

Models are available with either fixed or adjustable blades. Processes: Mine VentilationTunnels. When demands on equipment change and improved performance, higher efficiency, increased availability, reduced noise or lower maintenance are required, or when the equipment is simply getting old, upgrades and retrofits should always be the first option to explore. We would like to send you information that delivers, develops and promotes our products and services that are relevant to you.There are two primary varieties of fan, axial fans and centrifugal fans.

Pelonis Technologies, Inc. PTIa global leader in fan technology for more than 25 years, manufactures both axial and centrifugal fans. To help clear up that confusion, here is a breakdown of the fan types, their benefits, and their uses.

The design and function of a centrifugal fan is very different from those of an axial fan. Their differences make them each suited for different applications and customers are sometimes unclear as to which fan type will best suit their needs. Axial fans date back to the horizontally configured windmills of Europe in the Middle Ages. The first electrically powered fans, introduced in the s, were axial fans. Axial fans are named for the direction of the airflow they create.

Blades rotating around an axis draw air in parallel to that axis and force air out in the same direction.

Axial fans create airflow with a high flow rate, meaning they create a large volume of airflow. However, the airflows they create are of low pressure. They require a low power input for operation. Often called blowers, centrifugal fans vary differently from axial fans. The pressure of an incoming airstream is increased by a fan wheel, a series of blades mounted on a circular hub.

The airflow created by centrifugal fans is directed through a system of ducts or tubes. This helps create a higher pressure airflow than axial fans. Despite a lower flow rate, centrifugal fans create a steadier flow of air than axial fans. Centrifugal fans also require a higher power input. Because of the low-pressure high-volume airflows they create, axial fans are best suited for general purpose applications.

For example, they excel at moving air from one place to another, cooling confined spaces such as computers, and cooling larger spaces such as work spaces. A standard AC model is energy efficient, using no more than watts when on high speed. AC fans can be connected directly to a DC power source, such as solar panels or batteries. Since the end goal in units like vending machines is an even flow of cooling power, an AC fan is the fairly obvious choice.

What is an Axial Fan?

Currently, vending and refreshment industry leaders are trying to get the new generation excited about their services. As the new, hip crowd grows up attached to their technology, the industry is finding new and exciting ways to get their attention.

Cashless payment options, touch screens, and cell phone payment options are all becoming a part of the vending machine design. And just like any computer you might have in your office, overheating becomes a larger concern with all this technology is included in the new designs. With demanding technological features, you can see a drop-off in performance due to heat. AC fans are an excellent choice to maintain just the right amount of cooling for these components.

Because of the high pressure they create, centrifugal fans are ideal for high pressure applications such as drying and air conditioning systems. As all of their moving parts are enclosed and they also have particulate reduction properties that makes them ideal for use in air pollution and filtration systems. Centrifugal fans also offer distinct benefits:.

Even within the categories of axial or centrifugal fans, there is a great amount of variation between models, all suited for different uses. Topics: Cooling Fansac fanshvac products. Home Blog Axial Vs. Centrifugal Fans. Axial Vs. Axial vs Centrifugal Fans There are two primary varieties of fan, axial fans and centrifugal fans. Axial Fans Axial fans date back to the horizontally configured windmills of Europe in the Middle Ages.Some connection parts of industrial ceiling fans need to be connected with bolts.

There are often safety incidents on the market caused by the loosening of bolts of industrial ceili Large industrial ceiling fans basically use high-strength bolts as fasteners, which directly affect production safety, and examples of ceiling fan falling accidents often occur due to bol In the manufacture of large industrial ceiling fans, bolted connections play an important role.

Bolt connections have the advantages of detachability, convenient connection, and low cost of use. Bolt connections have the advantages of detachability, convenient connection, and low cost In the manufacture of energy-saving industrial fans, riveting is a common form of connection between fan blades and petioles. The most significant advantages are simple process methods an As a new type of fastener, the blind rivet has attracted more and more attention.

Because of its many unique advantages, it has replaced bolting and welding in many fields. Many large cei Rights Reserved. Long Tube FanMM. Short Tube FanMM. Nowadays, with 3 million yuan fixed assets, we have nearly employees, including more than 10 technical personnel. Annual production 0. Excellent production Why choose Beierde View more. News Center. Loose analysis of industrial large ceili Use of torque wrench for installation of How energy-saving industrial fans preven Introduction of Industrial Large Ceiling Our aim is to provide quality axial fans products and service to our partners.