Turbomachinery: number of stages and power of steam turbine

In summary, the conversation discusses the process of calculating the number of stages required and the actual power produced in a steam turbine. The given parameters include turbine speed, steam flow, steam inlet and outlet pressures, nozzle and blade velocity coefficients, blade angles, and blade velocity. The speaker explains that detailed calculations on the internal thermodynamics of the turbine must be done to determine the power produced by each stage and then added up to match the desired output. If the calculated output does not match the design output, the calculations will be repeated by changing the particulars of the stages. The speaker also provides a link to a sample calculation document.
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Please help!
Steam turbine. Given parameters: turbine speed, steam flow, steam inlet and outlet pressures, nozzle and blade velocity coefficients, blade angles and blade velocity. I can find all efficiencies. How could I calculate number of stages required and the actual power produced?
 
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You would have to do detailed calculations on the internal thermodynamics of the turbine. Essentially, you would be determining the power produced by each stage, and then adding them up to see if you get the output desired. If the calculated output does not match the design output, then the calculations will be repeated, changing the particulars of the stages until the calculated output matches the design figure.
 
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1. How does the number of stages affect the power output of a steam turbine?

The number of stages in a steam turbine refers to the number of sets of rotating blades and stationary nozzles that the steam passes through. The more stages a turbine has, the more times the steam expands and rotates the blades, resulting in a higher power output. This is because each stage extracts more energy from the steam, increasing the overall efficiency of the turbine.

2. What is the relationship between the power output and the size of a steam turbine?

The power output of a steam turbine is directly related to its size. The larger the turbine, the more steam it can process and the greater the power output. This is due to the fact that a larger turbine can accommodate more stages and larger blades, allowing for more energy to be extracted from the steam.

3. How do the efficiency and power output of a steam turbine change with increasing number of stages?

As the number of stages in a steam turbine increases, the efficiency and power output also increase. This is because each stage extracts more energy from the steam, resulting in a more efficient conversion of heat energy into mechanical energy. However, there is a point of diminishing returns, where adding more stages does not significantly increase the power output, but does increase the complexity and cost of the turbine.

4. Can a steam turbine be designed with an unlimited number of stages for maximum power output?

No, there are practical limitations to the number of stages that can be added to a steam turbine. As mentioned before, there is a point of diminishing returns where adding more stages does not significantly increase the power output but does increase the complexity and cost of the turbine. Additionally, adding too many stages can lead to issues such as excessive blade erosion and vibration, which can decrease the overall efficiency and reliability of the turbine.

5. How does the power output of a steam turbine compare to other types of turbines?

The power output of a steam turbine can vary greatly depending on its size and number of stages. However, in general, steam turbines have a higher power output compared to other types of turbines such as gas turbines or hydraulic turbines. This is due to the fact that steam turbines can handle higher temperatures and pressures, resulting in a more efficient conversion of heat energy into mechanical energy. Additionally, steam turbines can be designed for a wide range of power outputs, making them versatile for various applications.

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