Propeller vs Impeller
For those who have studied motion, especially that of different types of fans, there is no confusion between the terms propeller and impeller but ask those who think they have heard these two terms but haven’t studied them and you will get all sorts of answers. Part of the confusion is also because of similar sounding names but if one looks closely, the names themselves give away the meanings of the two different devices.
If you have ever seen pictures of ships closely, you must have noticed small rotating fans on both sides of the ship. These are propellers that actually help in propelling the ship forward. A propeller is an open running device that has the function of providing a thrust force. There is always a propelling fan on the mouth of an aircraft also. If we go by definitions given in various dictionaries, a propeller is a device having a revolving hub with rotating blades to propel an airplane, ship etc. In reality, a propeller is a special type of fan with blades that convert rotational motion into a force that helps in movement forward. This is because of a pressure difference that gets created between the front and the rear surfaces of the blades. This pressure difference pushes both air and water behind the blade. This thrust or force can be easily explained with the help of Newton’s laws of motion as well as Bernoulli’s theorem. Propellers are made heavy use of both in aviation as well as in ships.
您是否曾经注意到在家中使用的水泵后面的工作，这些水泵从主要管道穿过主道路并将其带入家中，然后将其提升到头顶罐中，从而吸收水？该泵背后的工作原理是壳体内部的叶轮，它会产生吮吸力，该吮吸力以极大的力量吸入液体并将其转移到头顶罐中。叶轮总是在壳体内部，因为其目的是将液体在提供外向并始终开放的螺旋桨上绘制液体。叶轮由于其旋转和特别设计的叶片而增加了流体的压力，因此增加了其流动的压力。用于吸收流体的离心泵是叶轮的最好例子。
In brief: Propeller vs Impeller •螺旋桨和叶轮都是具有电动机的专门设计的刀片。 • While a propeller is designed to covert rotational motion into forward thrust, an impeller is designed to use rotational motion to suck fluid in. •螺旋桨具有开放式设计，而叶轮总是在壳体或外壳内。 |
那海底使用叶轮呢？
A propeller moves itself, and whatever it is attached to, through a medium such as water or air whereas an impeller moves the medium (again, water or air) while itself remains stationary.
If you look out for the types of the pump blade u will find axial pump which acts exactly like a propeller
我说风扇或刀片是否被用来像船只和飞机一样移动身体，称为螺旋桨
但是，如果身体静止并移动另一个介质或物体，则称为叶轮
Agreed; for example Turbine Agitators are not located in a housing, but are located in a tank or vault. They use impellers to cause the desired motion in the liquid within the vessel.
No actually it is not true.. after 9 months of my comment I learnt a lot.. it is not as I thought.. the propeller makes a difference in pressure before and after the blades thus driving the fluid and making the thrust therefore the ship moves. however the impeller adds a kinetic energy ( velocity) to the fluid and there has to be a change in the cross sectional area of the pipe (increase in diameter) and according to Bernoulli’s law that kinetic energy will convert to a pressure… now this comment i’m 100% sure
OK, here is a question for you. Years ago a friend told me that the rotating disc in a shower head (shower massage device) is an impeller because it is activated my the motion of the fluid, opposed to propeller which imparts motion to stationary fluid. Well now this appears to be incorrect
So what do we call the blades on weathervanes, showerheads and wind mills?
非常有用的娱乐性