turbinebalancing.blogspot.com

Examination Notes For Marine Officers

Examination Notes For Marine Officers. LOW SPEED DYNAMIC BALANCING. This machine balances the rotor whilst it is still out of its casing. For best balancing the rotor is placed in its casing and run at high speed. HIGH SPEED DYNAMIC BALANCING. Another example is shown below, the rotor would pass a static balance test and a low speed dynamic balance test; but the tendency for the rotor to sag would mean that at speeds near to or at critical a very heavy vibration would occur. Critical speeds of rotors.

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Examination Notes For Marine Officers | turbinebalancing.blogspot.com Reviews

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Examination Notes For Marine Officers. LOW SPEED DYNAMIC BALANCING. This machine balances the rotor whilst it is still out of its casing. For best balancing the rotor is placed in its casing and run at high speed. HIGH SPEED DYNAMIC BALANCING. Another example is shown below, the rotor would pass a static balance test and a low speed dynamic balance test; but the tendency for the rotor to sag would mean that at speeds near to or at critical a very heavy vibration would occur. Critical speeds of rotors.

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Examination Notes For Marine Officers | turbinebalancing.blogspot.com Reviews

https://turbinebalancing.blogspot.com

Examination Notes For Marine Officers. LOW SPEED DYNAMIC BALANCING. This machine balances the rotor whilst it is still out of its casing. For best balancing the rotor is placed in its casing and run at high speed. HIGH SPEED DYNAMIC BALANCING. Another example is shown below, the rotor would pass a static balance test and a low speed dynamic balance test; but the tendency for the rotor to sag would mean that at speeds near to or at critical a very heavy vibration would occur. Critical speeds of rotors.

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turbinebalancing.blogspot.com

1

Examination Notes For Marine Officers: HP & LP Rotor

http://turbinebalancing.blogspot.com/p/hp-lp-rotor.html

Examination Notes For Marine Officers. HP and LP Rotor. Most modern HP rotors are made of a single gashed forging of high quality steel.A hole of 50mm is bored axially through the rotor to allow for internal ispection and to remove impurities and internal flaws which can cause premature failure. In addition to the blade wheels also found on the rotor are; Thrust collar, Journal bearing surfaces, Oil thrower, Gland, Conical seat, thread or flange to attach flexible coupling. Or pressure compounded design.

2

Examination Notes For Marine Officers: De Laval Impulse Turbine-Single Stage&Pressure Compounding (Rateau)

http://turbinebalancing.blogspot.com/p/de-laval-impulse-turbine-single-stage.html

Examination Notes For Marine Officers. De Laval Impulse Turbine-Single Stage&Pressure Compounding (Rateau). De Laval Impulse Turbine-Single Stage. Optimum efficiency occurs when the blade is moving at half the speed of the jet stream. To achieve this very high rotational speeds would be required ( in the order of 15000 rpm). High centrifugal stress, high journal speed and excessive gearing requirements prohibits the use of such system for propulsion by itself. Excessive number of stages produces an overl...

3

Examination Notes For Marine Officers: Reaction Turbine

http://turbinebalancing.blogspot.com/p/reaction-turbine.html

Examination Notes For Marine Officers. Ci= velocity of steam at inlet to blade, i.e. leaving nozzle( giving nozzle angle). Ci rel= velocity of steam relative to the blade( giving blade inlet angle). Co= Velocity of steam at outlet of blade. U/Ci = 0.9. If the heat drop across the fixed and moving blades are equal the design is known as half degree reaction. Steam velocity was kept small on early designs, this allowed the turbine to be directly coupled to the prop shaft. To keep annular leakage as small a...

4

Examination Notes For Marine Officers: Turbine Construction

http://turbinebalancing.blogspot.com/p/turbine-construction.html

Examination Notes For Marine Officers. Only the bottom part of the ingot is used. It is a requirements that forgings are heavily worked. Any small holes or defects canbecome hammer welded together. No forging is carried out below the plastic flow temperature as this can lead to work hardening. Forging will allow continuous grain flow. Ultimate tensile stress and elongation checked. This must be near enough equal in all 3 directions. Final machining is now given. The rotor is statically balanced and t...

5

Examination Notes For Marine Officers: Problems caused by incorrect warming through

http://turbinebalancing.blogspot.com/p/problems-caused-by-incorrect-warming.html

Examination Notes For Marine Officers. Problems caused by incorrect warming through. The main object of warming through is to ensure straightness of the rotor.To do this a negligible temperature gradient must exist throughout the rotor. There is a tendency for the rotor to hog where the steam is introduced( that is to say the rotor bends due to temperature gradient rather than sagging under gravitational forces) with the rotor steam is introduced. Hence the rotor must be rotated. The third objective is t...

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Examination Notes For Marine Officers

Examination Notes For Marine Officers. LOW SPEED DYNAMIC BALANCING. This machine balances the rotor whilst it is still out of its casing. For best balancing the rotor is placed in its casing and run at high speed. HIGH SPEED DYNAMIC BALANCING. Another example is shown below, the rotor would pass a static balance test and a low speed dynamic balance test; but the tendency for the rotor to sag would mean that at speeds near to or at critical a very heavy vibration would occur. Critical speeds of rotors.

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