What is the problem with Tesla turbine Nozzles?

[Storm_Eagle]

Hi. I have read about Tesla turbines. What i have found is that it is actually weary little research published on the subject. And as i understand it the main problem with them is the inefficiency in the nozzles used. While the turbine rotor efficiency in it self is really good.

But what exactly makes the nozzles people have tried using inefficient?

 

[berkeman]

Hi. I have read about Tesla turbines. What i have found is that it is actually weary little research published on the subject. And as i understand it the main problem with them is the inefficiency in the nozzles used. While the turbine rotor efficiency in it self is really good.

But what exactly makes the nozzles people have tried using inefficient?

Can you provide more links and technical details please? That would make it easier for us to address your question. Thanks.

https://en.wikipedia.org/wiki/Tesla_turbine

 

[Storm_Eagle]

Can you provide more links and technical details please? That would make it easier for us to address your question. Thanks.

https://en.wikipedia.org/wiki/Tesla_turbine

Well for example this report:
https://repository.asu.edu/attachments/97903/content//tmp/package-ufqfxU/Peshlakai_asu_0010N_12439.pdf
It gives rotor efficiency of over 90% witch is really good and it is also in line with other reports and pages i have read, but still the overall efficiency is typically lower than other types of turbines and typically around 30-40% from what i have read. And in the reports i have read (including the linked report) the major factor for the loss in efficiency is contributed to the design of the nozzles.
So the Tesla turbine in it self looks like a really good turbine, but the nozzles is preventing it from reaching it's potential. So as the original question said: What is the problem with Tesla turbine nozzles?

 

[anorlunda]

Did you read the references cited in that paper you linked?

2. Hoya, G.P., Guha, A., 2009, “The design of a test rig and study of the performance and efficiency of a Tesla disc turbine”. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 223, pp. 451-465.

5. Guha, A., Smiley, B., 2009, “Experiment and analysis for an improved design of the inlet and nozzle in Tesla disc turbines”, Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 224, pp. 261-277.