do anyone have any idea how to increase the mass flow rate or velocity of air flowing thro a blower???

Question

formulae or analysis point of view

pls can u give any relevant websites for reference????

can anyone give an idea of increasing the velocity of blower without increasing the motor hp ....... like, adding any new components in the path of air flow etc.....

Answer 1

Reduce any restriction of air flow at the input or output.

Increase the speed.

Edit 1
If air flow restrictions are reduced or the fan speed is increased, the load on the motor will increase due to the increased flow and the motor may be overloaded. A more powerful motor may be required. If a more powerful motor is installed without reducing air flow restrictions or increasing the fan speed, there will be no effect on air flow. Regardless of the motor's power rating, the motor will only deliver the power required to operate the fan under the given conditions.

Re Additional Details
Fans and centrifugal pumps are governed by the affinity laws.
http://www.engineeringtoolbox.com/affinity-laws-d_408.html
http://www.engineeringtoolbox.com/fan-affinity-laws-d_196.html

Re newer additional details:
The power required to move air is proportional to flow rate times pressure. If the flow rate is increased, the only way to keep the required power from increasing is to reduce the pressure. If there are flow restrictions that can be reduced, that will increase the flow rate while reducing pressure. Increasing duct area would reduce the resistance to flow and allow increased flow with reduced pressure.

Flow rate is proportional to velocity times duct area. A smaller duct with a higher pressure could provide higher velocity with a reduced flow rate and no increase in power required.

Answer 2

Can also decrease the temperature on the inlet side, since air is compressible, the density increases. THis though increases the laod on the motor as would be expected because if yo uincrease amss flow, requires more energy.

Other ideas include decrease pressure on discharge side, use larger pipe, or increase blower speed.

Answer 3

Increase the blower speed and the motor horsepower.

If you know how much you need for a mass flow rate,
call the blower manufacturer for a recommendation for a new blower speed, new pulley size, and new motor size.

If you only increase the blower speed by changing pulley sizes, you stand a good chance of burning up the motor

Answer 4

You can go to the Ideal Fan Laws and you can get some ideas from them, they even make a fan law calulator which is similiar to a ductulator.

Changing to a faster rpm motor or sheaves if belt driven would be the easiest and require the less downtime. This would also give a bigger increase than decreasing the overall pressure drop of the system.

Answer 5

There are two ways to increase the flow rate. One you would need to increase the pressure difference i.e. a bigger fan or a more powerful fan motor. Two would be to decrease the cross sectional area of the space the air is flowing through.