Hi All,
We have completed a grind to cleanup damage on a turbogenerator journal shaft.
The current surface finish is around 0.4 - 0.6 RA, Could this be too fine for reliable operation?
Regards,
JT
Hello,
I am interested to ask how is the high speed balancing of gas compressors carried out?
Does this always require a high speed balancing facility with a vacuum bunker?
How often is re-balancing required?
What is the typical lead-time and price to complete and how does this compare to...
Thankyou Greg,
That is what I am looking for. Determining the co-efficient of lift from the vane geometry is where I come unstuck,
I do like my colored diagrams ...
Cheers
It is difficult. I would like to ask in general - is the centrifugal load the main source of stress in a part like this? (single part fan hub and blades as pictured).
How much of the total stress is due to the actual aerodynamic loads?
I would expect once the force due to lift is accounted for...
We do not service fans. But moreso the generator they are attached to.
I am looking to get an idea on where the stress concentrations might be. Given the aluminium fans on a particular rotor have undergone excessive corrosion.
As a result of this we are worried about potential cracking around...
Might be out of my depth here.
Thought there might be a straighforward general formula using just the airfoil shape, angle of the blade, rotational speed.
I will have a search.
Regards,
Its not the data I am seaching for as much as the method to approximate it.
It is not so much for design but for awarness of failure modes in the machines I service.
within 10% error/accuracy?
The blade is a cooling fan blade for a turbogenerator.
Is there literature you would recommend to estimate this?
Regards,
JT
Hello,
I have a fan hub I am looking to get an idea of the stresses it is under.
Is there a way of appoximating the force normal to the surface given:
- Air/medium density
- Radial velocity
- Fanblade geometery
Kind regards,
JT
Waross, Polorization Index is what I am refering to.
Gr8blu, That answers my question regarding the thermal issue.
My next question would be; What is the trend betwee the ultimate failure voltage of a insulation system and temperature?
So a 15kV stator with class F insulation is suitable to...
Hello,
We routinely bake stators during overhauls after completing a steam wash to remove contamination.
I am interested in getting a better gauge of time required at temperature in order to ensure all moisture is removed.
Completing a PI test intermittently seems to be a logical way to...
Hello,
I have a result file in strand 7 showing a quadrant of a axysymmetric part.
Is there any way in post processing to copy the quadrant to show the complete part?
So i can display this as 1 full ring?
Kind regards,
JT
Yes IDS although I cannot see why the force is so low. only approx 860N total on the Z axis reactions. Is the method i have used to scale the force incorrect?
Yes rb1957 it is strand 7.
I am struggling to see the source of my error in this simple simulation
I am trying to verify the stresses on a fabrication when a 30 Ton generator is set down on the indicated areas. There are 4 supports assumed to be fully fixed at this stage in the simulation.
My calculations so far:
- For...
Hi Gr8blu,
Is there any obvious difference in design with the rotors where the rings are intended as part of the magnetic circuit as you mention?
I would not anticipate a larger ring would be required or any major mechanical changes would be required in using the 18-18 ring - Although I have...
Hi All,
What are the risks of replacing carbon steel magnetic retaining rings with non-magnetic 18-18 forged rings?
Is there a significant difference in flux generatation ? Are there any possible risks in replacing the rings with the modern standard?
18-18 is the unanymous material of choice...
