Please tell me where the balance hole is in the steam turbine, and what the difference is between impulse and reaction steam turbine structures.
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Please ask the master to draw the top and bottom of the picture, thank you
Does the impulse turbine have a balance drum? Is it enough to open a balance hole in the impeller?
The difference between impulse and reaction steam turbines is: 1. The cross-section of the moving blades of the reaction steam turbine is asymmetrical on the inlet side. The blade inlet is larger and the outlet side is thinner. The steam flow channel is tapered from the inlet to the outlet. However, the cross-section of the moving blades on the inlet side of the impulse turbine is relatively symmetrical, and the area of the air flow channel is basically unchanged from the inlet to the outlet. 2. The pressure drop of the steam in the impulse turbine is generated in the nozzle of the partition plate, and the pressure drop of the steam in the reaction steam turbine is generated in the stationary blades mounted on the cylinder and the moving blades mounted on the rotor. The moving blades of the impulse turbine are mounted on the impeller. The blades of a reaction turbine are mounted on a rotating drum. 3. In order to balance the thrust, the impulse turbine impeller is equipped with a balancing hole, while the reaction steam turbine is equipped with a balancing piston on the drum. Yes, the hole in the fourth picture is the impeller balance hole.
Circled in red is the balance hole
The difference between impulse type and reaction type is that the blade shape is different