Why does the power of a turbine decrease at higher speeds?
Hello,
question is in the title.
Kind regards
kilomilo40
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The power of a turbine depends on various factors, including the speed. In many turbines there is a certain speed range in which the turbine works efficiently and delivers optimal power. If the speed exceeds this optimal level, a decrease in power can occur. Here are some reasons why the power of a turbine can decrease at higher speeds:
1. Aerodynamic effects: At higher speeds, aerodynamic effects can be noticed which impair the efficiency of the turbine. For example, flow losses can increase or turbulences can form which reduce the power of the turbine.
Two. Mechanical loading: With increasing speed, the mechanical load on the turbine also increases. This can lead to increased wear, vibrations or other mechanical problems that impair performance.
3. Lubrication and cooling: At very high speeds, the lubrication and cooling of the turbine may no longer be sufficient to maintain an optimal performance. This can lead to overheating or to increased wear.
4. Material limits: The materials from which the turbine is made have certain limits as to the maximum speed they can safely process. If these limits are exceeded, material fatigue or other damage may occur which affect performance.
It is important to carefully monitor the operating parameters of a turbine and to ensure that it is operated in the optimal speed range to ensure maximum performance and efficiency. Operators of turbines should observe the specific operating limits and recommendations of the manufacturer to avoid problems and maximize the life of the turbine.
The wings of a turbine are optimized for a specific speed. In extreme cases, the tips come into the supersonic range. And if they can rotate faster than they can suck, they create a vacuum in which they do not shove anything – so high speed little effect, as with a vacuum cleaner to hold the pipe.
Thanks for the answer, this text would be so correct (scientific):
The wings of a turbine are designed so that they work best at a certain number of turns and the power is the highest. If you turn turbine too fast and much, it can reduce performance. But why? The turbine of a hydropower plant requires a certain amount of water flow to work efficiently. If the water flow is too low and the turbine turns too fast, the turbine cannot gain enough energy from the water to effectively generate electricity. This leads to a lower power.
MfG
No, it shouldn’t be that correct. I had already thought to ask if you mean a gas turbine or water turbine, one that drives or one that is driven. I went out of an aircraft engine or the like. However, since water is not compressible and cannot be turned into a vacuum, the comparison with a vacuum cleaner is of course nonsense.
However, it is true that turbine blades have a certain angle of incidence for an optimal speed. I just don’t understand how the speed can get too high. Does too much water press? I’m not expert enough. In the case of ship screws that turn too fast, water at the tips turns into steam bubbles that destroy the material. In the case of water-driven turbines, I do not know whether such speeds are reached.