Compression Angle
May 1st, 2004
How Does A Ducted Fan Work?
Hey Guys, I’m currently working on a project which requires a rather large ducted fan. My question is; How do they work? I need to know the processes that take place (like in a jet engine, there’s combustion, compression etc. That sort of thing.) Also, if you could, I would like to know about the propellers/blades; at what angle they should be at to suck air in (like / or .)
Thanks Guys
A ducted fan is a propulsion arrangement whereby a fan, which is a type of propeller, is mounted within a cylindrical shroud or duct. The duct reduces losses in thrust from the tip vortices of the fan, and varying the cross-section of the duct allows the designer to advantageously affect the velocity and pressure of the airflow according to Bernoulli’s Principle. Ducted fan propulsion is used in aircraft, airships, airboats, hovercraft and fan packs.
In aircraft applications, ducted fans normally have more and shorter blades than propellers and thus can operate at higher rotational speeds. The operating speed of an unshrouded propeller is limited since tip speeds approach the sound barrier at lower speeds than an equivalent ducted fan. The most common ducted fan arrangement used in full-sized aircraft is a turbofan engine, where the power to turn the fan is provided by a gas turbine. Turbofan engines are used on nearly all airliners, fighters, and bombers. However, a ducted fan may be powered by any source of shaft power such as a reciprocating engine, Wankel engine, or electric motor. A kind of ducted fan, known as a fantail or by the trademark name Fenestron, is also used to replace tail rotors on helicopters. Ducted fans usually have an odd number of blades to prevent resonance in the duct.
You can just give it a google search so you could find lots of details regarding the subject.
Good luck!
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BRASS COMPRESSION CAP 3/8″ (LEAD FREE) ANGLE STOP VALVE CAP $1.39 |
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Brasscraft Angle Stop & Supply Line OCR19120S Compression Type $1.50 |
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90 Degree Right Angle RG6 Coax F Type Compression Connector FS6URA New $2.25 |
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90 Degree Right Angle RG6 Coax F Type Compression Connector FS6URA $2.25 |
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90 Degree Right Angle RG6 Coax F-Type Compression Connector FS6URA $2.25 |
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BRASSCRAFT OCR49 C COMPRESSION ANGLE STOP 1/2″X5/8” $2.30 |
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14 G Compression Speaker Connector – 45º Angle Pin Tip $2.85 |
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16 G Compression Speaker Connector – 45º Angle Pin Tip $2.85 |
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12 G Compression Speaker Connector – 45º Angle Pin Tip $2.85 |
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1/2″ PEX x 1/4″ Compression Angle Stop Valve $2.99 |
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1/2″ PEX x 3/8″ Compression Angle Stop Valve $2.99 |
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(1) 1/2″ Sweat x 3/8″ OD Compression Angle Stop Valve $3.15 |
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Kramer CON-COMP-BNC/M/RA/RG-6 BNC (M) Right Angle Compression Connector Green $3.20 |
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Kramer CON-COMP-RCA/M/RA/RG-59 RCA (M) Right Angle Compression Connector Red $3.20 |
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Kramer CON-COMP-RCA/M/RA/RG-6 RCA (M) Right Angle Compression Connector Green $3.20 |
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Princeton Brass PKF3310 3/8 FIP x 3/4 inch compression angle stop shutoff valve $3.87 |
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KB 3/8 FIP x 3/4″ compression angle stop shutoff valve PC finish KF3310 $3.87 |
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3/8″ PEX x 1/4″ Compression Angle Stop Valve $3.99 |
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ProPlus Water Supply Valve Angle Stop 5-8″ OD Compression x 3/8″ OD Compression $3.99 |
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Kramer CON-COMP-BNC/M/RA/RG-59 BNC (M) Right Angle Compression Connector Red $4.00 |
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RF RCA Male Right Angle 90 degree RG-6 Connector Adapter Compression Waterpoof $4.28 |
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Brass 15/64″ Tubing 1/2″ Male Threaded Right Angle Compression Elbow Connector $4.30 |
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Brass 15/64″ Tubing 1/2″ Male Threaded Right Angle Compression Elbow Connector $4.31 |
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5/16″ Tube Tubing 1/2″ Male Thread Brass Right Angle Compression Elbow Connector $4.38 |
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15/64″ Tube Tubing 3/8″ Male Thread Right Angle Compression Elbow Brass Fitting $4.38 |
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5/16″ Tube Tubing 1/2″ Male Thread Brass Right Angle Compression Elbow Connector $4.43 |
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15/64″ Tube Tubing 3/8″ Male Thread Right Angle Compression Elbow Brass Fitting $4.50 |
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BRASS CRAFT SCR19C COMPRESSION ANGLE STOP 1/2″ x 3/8″ $4.50 |
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KB 1/2 sweat x 3/8″ compression angle stop shutoff valve PC finish KF4320 $4.52 |
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KB 5/8″ x 3/8″ compression angle stop shutoff valve PC finish KF5330 $4.52 |
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15/64″ Tube Tubing 3/8″ Male Thread Right Angle Compression Elbow Brass Fitting $4.59 |
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15/64″ Tube Tubing 3/8″ Male Thread Right Angle Compression Elbow Brass Fitting $4.60 |
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15/64″ Tube Tubing 3/8″ Male Thread Right Angle Compression Elbow Brass Fitting $4.60 |
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Brass 1/2″ Male Thread Right Angle 3/8″ Tube Compression Elbow Adapter Coupler $4.63 |
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15/64″ Tube Tubing 3/8″ Male Thread Right Angle Compression Elbow Brass Fitting $4.64 |
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5/16″ Tube Right Angle 3/5″ Male Thread Compression Elbow Coupling Pipe Fitting $4.68 |
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5/16″ Tube Tubing 1/2″ Male Thread Brass Right Angle Compression Elbow Connector $4.75 |
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Brass 15/64″ Tubing 1/2″ Male Threaded Right Angle Compression Elbow Connector $4.75 |
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5/16″ Tube Tubing 1/2″ Male Thread Brass Right Angle Compression Elbow Connector $4.77 |
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5/16″ Tube Tubing 1/2″ Male Thread Brass Right Angle Compression Elbow Connector $4.78 |
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15/64″ Tube Tubing 3/8″ Male Thread Right Angle Compression Elbow Brass Fitting $4.78 |
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5/16″ Tube Tubing 1/2″ Male Thread Brass Right Angle Compression Elbow Connector $4.79 |
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Compression Angle Valve 5/8″ OD Inlet x 1/2″ OD Outlet $4.79 |
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15/64″ Tube Tubing 3/8″ Male Thread Right Angle Compression Elbow Brass Fitting $4.81 |
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Brass 15/64″ Tubing 1/2″ Male Threaded Right Angle Compression Elbow Connector $4.82 |
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Brass 1/2″ Male Thread Right Angle 3/8″ Tube Compression Elbow Adapter Coupler $4.85 |
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5/16″ Tube Right Angle 3/5″ Male Thread Compression Elbow Coupling Pipe Fitting $4.88 |
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5/16″ Tube Tubing 1/2″ Male Thread Brass Right Angle Compression Elbow Connector $4.94 |
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Brass 15/64″ Tubing 1/2″ Male Threaded Right Angle Compression Elbow Connector $4.94 |
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3/5″ Thread Right Angle Male Compression Elbow Connector for 15/32″ Tube Tubing $4.96 |
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Brass 1/2″ Male Thread Right Angle 3/8″ Tube Compression Elbow Adapter Coupler $4.98 |
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5/16″ Tube Right Angle 3/5″ Male Thread Compression Elbow Coupling Pipe Fitting $4.99 |
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Brass 1/2″ Male Thread Right Angle 3/8″ Tube Compression Elbow Adapter Coupler $5.00 |
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Brass 1/2″ Male Thread Right Angle 3/8″ Tube Compression Elbow Adapter Coupler $5.00 |
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5/16″ Tube Right Angle 3/5″ Male Thread Compression Elbow Coupling Pipe Fitting $5.01 |
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5/16″ Tube Right Angle 3/5″ Male Thread Compression Elbow Coupling Pipe Fitting $5.01 |
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5/16″ Tube Right Angle 3/5″ Male Thread Compression Elbow Coupling Pipe Fitting $5.01 |
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Brass 1/2″ Male Thread Right Angle 3/8″ Tube Compression Elbow Adapter Coupler $5.02 |
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Princeton Brass PKF4310 1/2 FIP x 3/8 inch compression angle stop shutoff valve $5.17 |
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Princeton Brass PKF4440 1/2 FIP x 1/2 inch compression angle stop shutoff valve $5.17 |
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Brass 1/2″ Male Thread Right Angle 3/8″ Tube Compression Elbow Adapter Coupler $5.20 |
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5/16″ Tube Right Angle 3/5″ Male Thread Compression Elbow Coupling Pipe Fitting $5.21 |
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Brass 1/2″ Male Thread Right Angle 3/8″ Tube Compression Elbow Adapter Coupler $5.23 |
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Brass 1/2″ Male Thread Right Angle 3/8″ Tube Compression Elbow Adapter Coupler $5.23 |
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24603 New-No Box, Brass Craft SCR19 C Compression Angle Stop 1/2″ NOM COMP INLET $5.25 |
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3/5″ Thread Right Angle Male Compression Elbow Connector for 15/32″ Tube Tubing $5.35 |
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3/5″ Thread Right Angle Male Compression Elbow Connector for 15/32″ Tube Tubing $5.36 |
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3/5″ Thread Right Angle Male Compression Elbow Connector for 15/32″ Tube Tubing $5.39 |
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3/5″ Thread Right Angle Male Compression Elbow Connector for 15/32″ Tube Tubing $5.39 |
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5/16″ Tube Right Angle 3/5″ Male Thread Compression Elbow Coupling Pipe Fitting $5.51 |
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3/5″ Thread Right Angle Male Compression Elbow Connector for 15/32″ Tube Tubing $5.59 |
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3/5″ Thread Right Angle Male Compression Elbow Connector for 15/32″ Tube Tubing $5.59 |
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Kramer CON-COMP-RCA/M/RA/RG-179 RCA (M) Right Angle Compression Connector $5.60 |
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3/5″ Thread Right Angle Male Compression Elbow Connector for 15/32″ Tube Tubing $5.83 |
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24602 New In box, Brass Craft SCR19 C Compression Angle Stop 1/2″ NOM COMP INLET $5.89 |
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APPLIANCE PART-OVERSTOCK”Plumbing-5/8″X 7/16″ Angle Stop Compression-Never Used $5.99 |
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BRASSCRAFT OR17C 1/2″x3/8″COMPRESSION ANGLE STOP $6.00 |
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BRASSCRAFT OR17C 1/2″x3/8″COMPRESSION ANGLE STOP $6.00 |
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FLUIDYNE ANSONIA OR17C 1/2″x3/8″COMPRESSION ANGLE STOP $6.05 |
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COMPRESSION ANGLE STOP OR17C 1/2″x3/8″ $6.10 |
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1/2″ NPT TO 1/4″ COMPRESSION RIGHT ANGLE BRASS SHUT OFF VALVE RESTAURANT SUPPLY $6.94 |
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15/64″ Tube Tubing 3/8″ Male Thread Right Angle Compression Elbow Brass Fitting $7.73 |
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15/64″ Tube Tubing 3/8″ Male Thread Right Angle Compression Elbow Brass Fitting $7.75 |
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5/16″ Tube Tubing 1/2″ Male Thread Brass Right Angle Compression Elbow Connector $8.14 |
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5/16″ Tube Right Angle 3/5″ Male Thread Compression Elbow Coupling Pipe Fitting $8.33 |
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3/5″ Thread Right Angle Male Compression Elbow Connector for 15/32″ Tube Tubing $8.33 |
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Brass 1/2″ Male Thread Right Angle 3/8″ Tube Compression Elbow Adapter Coupler $8.38 |
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5/8″ COMPRESSION CHROME ANGLE VALVE STOP FITS OVER 1/2″ COPPER PIPE NEW $8.54 |
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Autometer 90 Right Angle Fitting Adapter 1/8″ NPT $8.95 |
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Flair-It 1/2″ PEX x 3/8″, Compression Angle Stop Valve $9.34 |
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90 degree right angle compression connector 90SNS1P6U RG6 coaxial TV cable coax $9.98 |
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3 Pack PS52 BrassCraft Angle Valve Compression Fitting 5/8″ OD X 3/8″ OD Tube $9.99 |
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3 Pk BrassCraft Compression Valves Angle PS52 or Straight PS54 $9.99 |
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3 Pk BrassCraft Compression Valves Angle PS52 or Straight PS54 $9.99 |
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Brasscraft key inc keyed angle valve 1/2″ x 3/8″ nom compression KTSCR19 STSCR19 $10.00 |
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Brasscraft Screw Driver Slot angle valve 1/2″ x 3/8″ nom compression SSSCR19 $10.00 |
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Brasscraft key keyed angle valve 1/2″ FIP x 3/8″ nom compression KTSOR19 STSOR19 $10.00 |
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Ace Compression Angle Shut-Off Valve $11.00 |
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BrassCraft Chrome Compression Angle Stop OCR19 C Lot of 5 $12.50 |
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NEW BRASS CRAFT Compression Angle Stop BUNDLE 11 Boxes- 1/2″NonCompX 3/8″OdTube $13.00 |
