Turbine - Selection, Specific Speed

turbine

Table of Contents

Introduction
Water turbines
- Impulse turbines
- Reaction turbines
  - Axial-flow machines
  - Mixed-flow turbines
- Other design considerations
  - Output and speed control
  - Cavitation
  - Turbine selection on the basis of specific speed
  - Turbine model testing
- Applications
  - Electric power generation
  - Pumped storage
  - Tidal plants
  - Cost of hydroelectric power
- History of water turbine technology
Steam turbines
- Classifications
  - Condensing and noncondensing turbines
  - Steam extraction
  - Reheat and nonreheat turbines
  - Multiflow and compound arrangements
- Principal components
- Design considerations
  - Blading design
  - Turbine staging
- Power development
- Control
- Overall performance characteristics
- History of steam turbine technology
  - Early precursors
  - Development of modern steam turbines
  - Recent developments and trends
Wind turbines
- Types of wind turbines
  - Horizontal axis machines
  - Vertical-axis machines
- Wind farms
- Limitations on wind power
- Development of wind turbines

References & Edit History Related Topics

Images

schematic of an impulse stage with velocity diagrams

idealized 50 percent reaction stage for a steam turbine

For Students

turbine summary

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Initial turbine selection is usually based on the ratio of design variables known as the power specific speed. In U.S. design practice this is given bywhere n is in revolutions per minute, P is the output in horsepower, and H is the head of water in feet. Turbine types can be classified by their specific speed, N, which always applies at the point of maximum efficiency. If N ranges from one to 20, corresponding to high heads and low rotational speeds, impulse turbines are appropriate. For N between 10 and 90, Francis-type runners should be selected, with slow-running, near-radial units ...(100 of 9585 words)

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