is there a scientific formula or maybe a device to measure the wind speed from the fan's blades? (this is for a science project concerning wind power and i've been searching the internet with no results) THANKS :)
2006-06-18 12:33:52 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
Theres a tool called a Handheld Anemometer, amazon has one inexpensive
2006-06-18 12:37:03 · answer #1 · answered by microsvc 5 · 1⤊ 0⤋
There's no specific correlation between the RPM and the speed of the air. The configuration and number of the blades make a significant difference in how much air the fan can move and at what speed.
2006-06-18 19:55:33 · answer #2 · answered by Flyboy 6 · 0⤊ 0⤋
You need to find the fan blade's pitch. The pitch is pretty much how much the blades are "turned" or "curved" on their axis. It's measurement is usally the distance the air travels per each revolution of the fan. Imagine a cylinder of air that moves each time the fan makes one revolution. The heigth of that cylinder is the fan's pitch. Once you have the pitch you can use this: ((P*rpm)/60)/12*0.6818181818 approximently = windspeed in mph
P is pitch in inches
0.6818181818181 is the conversion factor for feet per second to mph
So to break it down, pitch*rpm=inches per minute. Devide by 60 for inches per second, devide by 12 for feet per second and multiply by 0.681818 for mph. Measuring the pitch is beyond me but if its a house fan, I would guess 12-14 inches?
2006-06-18 20:03:35 · answer #3 · answered by mm3mmt 3 · 0⤊ 0⤋
I don't know the formula, But I know that the length of the blade, temperature, pressure and humidity are factors
2006-06-18 19:38:24 · answer #4 · answered by Mojo Jojo 3 · 0⤊ 0⤋