For a single hydro turbine blade design, if I consider amplitude = 10 mm and wavelength = 50, what should be the value for a whole blade with 3/5 blades?
According to compositesworld.com and mdpi.com, designing a hydro turbine blade with a sinusoidal profile, such as the one you're describing, is a complex process involving many factors. The amplitude and wavelength you specified (10 mm and 50 mm, respectively) would apply to each blade's sinusoidal pattern.
If you're asking how these values would change if you designed a turbine with either three or five blades, the answer is that they wouldn't. The amplitude and wavelength of the sinusoidal pattern are properties of the individual blades, not the turbine as a whole. Therefore, whether you have three or five, each blade would still have the same sinusoidal pattern with an amplitude of 10 mm and a wavelength of 50 mm.
However, the overall performance of the turbine (such as its efficiency and power output) would be affected by the number of blades. This is due to factors like the distribution of forces on the turbine and water flow between the blades. These complex issues need to be analyzed using fluid dynamics simulations or other engineering tools. The actual design of a hydro turbine is a complex engineering task that requires a detailed understanding of fluid dynamics, materials science, and other fields. If you plan to design a hydro turbine, I recommend consulting with an engineer or other expert in this field.
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