- Power Tools
-
Saws
Chain Saw Concrete Chain Saw Band Saw Reciprocating Saw ...
-
Cutters
Pneumatic Cutter Pipe Cutting Machine Nut Cutter
-
Drills
Hammer Drill Pistol Hammer Drill Two Hand Operation Drill Column Drill ...
-
Impact Wrenches
Pneumatic Impact Wrench (Ex-proof Series) Pneumatic Impact Wrench (Ultra light Series) Emulsion Impact Wrench Nut Runner ...
-
Torque Wrenches
Pneumatic Torque Wrench Electric Torque Wrench Hydraulic Torque Wrench Hollow Hydraulic Wrench ...
-
Mining Waterjet Cutting Machine
Electric Mining Waterjet Cutting Machine Pneumatic Mining Waterjet Cutting Machine Emulsion Mining Waterjet Cutting Machine
-
Hammers
Pneumatic Chipping Hammer Hydraulic Chipping Hammer
-
Scaler
Pneumatic Long Reach Scaler
-
Rammer
Pneumatic Rammer
-
Grinders
Wet Grinder Angel Grinder Electric Grinder
-
Fan
Pneumatic Fan Heavy Fixed Fan
-
Hoist
Chain Hoist Electric Hoist Pneumatic Hoist Hydraulic Hoist ...
-
Winch
Pneumatic Winch
-
Pump
Pneumatic Submersible Pump Emulsion Submersible Pump
-
Assembly
Torque Multipler C-Hog Ring Plier
-
- Accessories
-
Cutting
Chainsaw Concrete Chainsaw Band Saw Reciprocating Saw ...
-
Drilling
Impact Drills Light Drills Magnetic Drills丨Rail Drills Balance Drills丨Angle Drills ...
-
Assembly
Impact Wrenches C-Hog Ring Plier
-
Hammer & Shovel
Chipping Hammer Derusting Shovel
-
Grinding
Grinders
-
Hydraulic Accessories
Nut Runner Cutter
-
General Accessories
Waterjet Cutting Machine Filter assy. Filter assy. Water Pump ...
-
- Company Profile
- Service
- News
-
Events
The 21st 2023 Taiyuan Coal (En The 17th Yulin International C The 20th TaiYuan (2021) Coal ( The 16th Ordors International Have a machine repaired or hav ...
-
Case Study
Specifications of adjustable w Have a machine repaired or hav
-
Industry News
Using Chainsaws to Cut Snow? What to do if the pneumatic wr Hydraulic chain saw Operation of the wrench Introduction to the principle ...
-
- Download
- Contact
You are here: >
Noise Source of Axial Fans
source:Industry News release time:2021-01-21 Article author:Rosit Popular:Air band saw
According to analysis, the noise source of axial fans is basically dipole in nature. Noise is caused by the impulse force of the blade acting on the air flowing through the fan.
There are two discrete frequency noise sources of the fan, one is the propeller-like noise caused by the pressure field of the rotor blade movement, and the other is the blade pulsation noise caused by aerodynamic interference. The distance between wind maneuver and stationary blade is an important factor of interference noise.
When the distance is small, changes in the potential flow and wake will have an impact.The blade may also act as a sound barrier to strengthen the sound radiation generated by the lift pulse on the blade adjacent to the blade row.
The effect depends on the ratio of the wavelength of the sound wave related to lift pulsation to the size of the blade as a barrier. In the frequency range where the ratio is greater than 2, the change in radiation intensity due to this effect is significant.
Therefore, when the upstream and downstream of a noise-radiating blade have the same number of blades, and each blade in the two rows of blades meets a rotor blade at the same time and constitutes a sound barrier on both sides of the source, the effect will be stronger.
Rosit is a leader in the global power tool service market. We take electric, pneumatic and hydraulic drive technology as the core. Our product categories mainly include hand tools, instruments, workshop equipment and fixed tools, labor protection products, industrial equipment,chemicals and so on.
At the same time, we provide customers with a series of system solutions and communication channels to help customers improve procurement, inventory, logistics and management costs.
Read recommendations:
AN31-100000 Hydraulic Torque Wrench
related articles
Using Chainsaws to Cut Snow?
2024-05-21What to do if the pneumatic wrench is weak
2022-12-19Hydraulic chain saw
2022-12-13Operation of the wrench
2022-12-06Introduction to the principle of pneumatic wrench
2022-11-28How to use the pneumatic wrench
2022-11-21Brief introduction to the principle of pneumatic wrench
2022-11-14Impact pneumatic wrench
2022-11-07Correct hydraulic wrench operation procedure
2022-11-01Hydraulic wrench torque pressure conversion
2022-11-01Field operation procedure of hydraulic wrench
2022-10-24Hydraulic radial plunger motor
2022-10-17The history of hydraulic motors
2022-10-17Principle of balance hydraulic wrench
2022-10-10The Price Factor of Smart Electric Torque Wrench
2022-10-10Introduction to the advantages of using intelligent electric torque wrench
2022-10-10The Price Factor of Smart Electric Torque Wrench
2022-10-10Classification and use of wrenches
2022-10-10hydraulic wrench pressure conversion
2022-10-10Introduction to the advantages of the use of intelligent electric torque wrench
2022-10-10Smart Electric Torque Wrench Selection Guide
2022-10-10Intelligent electric torque wrench for wind power generation
2022-10-09Uses of open-end wrenches.Pneumatic chainsaw
2022-10-08What are the driving parts of a hydraulic wrench and what they do
2022-09-30What are the driving parts of a hydraulic wrench and what they do
2022-09-23the commonly used wrenches
2022-09-22Introduction of several common wrenches
2022-09-21Application scope and daily maintenance method of hydraulic bolt tensioner
2022-09-20Characteristics of hollow hydraulic wrench and precautions for use
2022-09-19Characteristics and precautions of driving hydraulic wrench
2022-09-17Power Tools
CD31-630 Hydraulic Concrete Chainsaw
2023-06-16RH31-1350 Hydraulic Chipping Hammer
2023-06-27AW22-6000 Pneumatic Impact Wrench (Ultra-Light Series)
2021-06-15AN32-23000 Hollow Hydraulic Wrench
2023-06-27DM21-023 Pneumatic magnetic drill
2021-06-15AW41-1500 Emulsion Impact Wrench
2020-06-13AN22-2500 Pneumatic Torque Wrench (Straight Shaft)
2023-06-27CW21-022 Pneumatic Bender
2022-12-12CC21-630 Pneumatic Chainsaw (3.0 kw Series)
2023-06-14LH21 Series Pneumatic Hoist
2023-05-11AN32-5000 Hollow Hydraulic Wrench
2023-06-27DM11-050 Electric Magnetic Drill
2022-12-30AW21-2000 Pneumatic Impact Wrench (Ex-proof Series)
2021-06-15DM31-035 Hydraulic Magnetic Drill
2022-12-30OW62-020 Integrated Emulsion Mining Waterjet Cutting Machine
2023-05-10DB21-028 Pneumatic Rotary Drill Heavy Duty
2023-06-19OF22-880 Pneumatic Fan (light/medium)
2023-06-28AN51-1600 Electric servo CNC Torque Wrench
2023-06-27AN21-400 Pneumatic Nut Runner
2022-12-20AK71-130 Manual C-Hog Ring Plier (1.5 coil)
2022-12-12DB21-100 Pneumatic Rotary Drill Heavy Duty
2023-06-19LH61-015 Emulsion Hoist
2023-06-29CB11-310 Electric Band Saw
2023-06-16AN11-4500 Electric servo CNC Torque Wrench
2023-06-27CH31 series Hydraulic Pipe Cutter
2022-12-12AN32-17000 Hollow Hydraulic Wrench
2023-06-27CC20-530 Pneumatic Chainsaw (3.0 kw Series)
2023-06-14AN22-750 Pneumatic Torque Wrench (Straight Shank)
2020-06-13AW41-2500 Emulsion Impact Wrench
2021-06-15AW21-2200 Pneumatic Impact Wrench (Ex-proof Series)
2021-06-15Accessories
Core Drill Morse Taper Sleeves
2023-06-07Alloy Twist Drill Bits
2023-06-06Split Hollow Drill Bits丨DC82
2023-06-07Alloy Saw Blades丨CR814 Series
2023-06-06Shovel Blades
2023-06-07Alloy Twist Drill Bits丨DB81 Series
2023-06-06Carbide Inserts Twist Bits丨DB82 Series
2023-06-06Hard Alloy Hollow Drill Bits assy.丨DB85 Series
2023-06-07Alloy Drill Bits丨811 Series
2023-06-06Clamps
2023-06-06Hard Alloy Hollow Drill Bits assy.丨DB84 Series
2023-06-07Alloy Saw Chains丨CC812/CC816 Series
2023-06-06Carbide Hollow Rail Drill Bits丨DM822 Series
2023-06-06Alloy Saw Blades丨CR811 Series
2023-06-06Integrated Hollow Drill Bits丨DC81
2023-06-07Diamond Saw Blades
2023-06-06Filter assy.
2023-06-07Grinding Disc
2023-06-07Drill Bit Extension Rods丨DC88 Series
2023-06-07Alloy Saw Blades丨CR816 Series
2023-06-06Water Pump
2020-06-13Cross Clamps丨CB862-22
2023-06-06Tool Bits
2023-06-07Optional Accessories
2023-06-07Pipe Fixed Clamps丨CB861-12
2023-06-06Hydraulic Pump Station
2023-06-07Cutting Blades
2023-06-07Diamond Saw Blades
2023-06-06Hydraulic Regulating Valve
2023-06-07Oiler
2020-06-13
