glissement/sur la courbe
English translation: slip/on the fan curve
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| 08:26 Jul 21, 2005 |
| French to English translations [PRO] Tech/Engineering - Engineering: Industrial / fume treatment centre/ventilation | |||||||
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|  Selected response from: Robert Frankling Local time: 22:20 | ||||||
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| Summary of answers provided | ||||
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| 4 +2 | slip/on the fan curve |
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| 3 | sliding/along the curve |
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Answers
5 hrs confidence: 
peer agreement (net): +2
peer agreement (net): +2slip/on the fan curve Explanation: glissement=slip point de fonctionnement=operating point courbe du ventilateur=fan curve (calcul) All you need to know about fans Mike Turner, Comair Rotron The governing principle in fan selection is that any given fan can only deliver one flow at one pressure in a particular system. This "operating point" is determined by the intersection of the fan static pressure curve and the system pressure curve. Figure 3 illustrates the operating points of both high and low resistance systems. It is best to select a fan that will give an operating point being toward the high flow, low pressure end of the performance curve to maintain propeller efficiency and to avoid propeller stall. Each particular electronic packaging system should be analyzed for possible reduction in the overall resistance to airflow. Other considerations, such as available space and power, noise, reliability, and operating environment should also be brought to bear on fan choice http://www.electronics-cooling.com/Resources/EC_Articles/MAY... -------------------------------------------------- Note added at 5 hrs 48 mins (2005-07-21 14:14:48 GMT) -------------------------------------------------- glissement=slip or slip-stream In the figure, the dotted line marks out a cylindrical region containing the air influenced by the propeller, the slip stream. At the left, velocities relative to the aircraft are shown, while at the right are the absolute velocities. V is the speed of the aircraft, and the relative velocity of approach of the air. V\' is the speed of the air behind the propeller. Since V\' > V for positive thrust, the area of the slip stream is smaller in the wake of the propeller than in front of it. The absolute velocity in the slip stream is ÄV = V\' - V. http://www.du.edu/~jcalvert/tech/fluids/fan.htm#Slip -------------------------------------------------- Note added at 1 day 7 hrs 29 mins (2005-07-22 15:56:15 GMT) -------------------------------------------------- 3. Eddy current couplings and other slip devices modify the fan curve but do so via \"slip\" between the fan motor and the fan - so the motor continues to operate at close to rated speed and to require close to full rated horsepower. http://www.reliance.com/prodserv/standriv/appnotes/d7735.pdf The permanent split capacitor (PSC) motors used in the baseline furnaces do not operate at constant speed. The difference between actual operating speed and the synchronous speed of an induction motor is referred to as slip. For six-pole induction motors, the synchronous speed is 1200 rpm. At the rated speed of these motors of 1075 rpm, so the slip is 125 rpm. S N N sync = - where: = motor slip (rpm), SN sync = synchronous blower speed (rpm), and = motor speed (rpm). N For a broad operating range, the slip on induction motors is proportional to the load. For blower motors the load is the shaft power of the blower.3 http://www.eere.energy.gov/buildings/appliance_standards/res... |
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