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发表于 2016-6-23 14:46
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来自： 中国上海
Steam Turbines use energy of steam, which is expanded through aptly designed blades in turbine, finally giving work output. It runs on Rankine Cycle.
A gas turbine does the same using energy of burnt gas by expanding it.
Expansion is nothing but decrease in pressure and increase in volume of steam or gas, which converts its pressure energy into kinetic energy (or mechanical work). It runs on Brayton Cycle.
Water turbine (or hydraulic turbines) on the other hand, converts the potential energy of stored liquids (generally at heights implying higher pressure) into kinetic energy while passing through its blades. It doesn't have any cycle. It runs on principle of Pelton Wheel or Francis or Kaplan Turbine depending on requirements and scope.
Finally, IC engines are engines which converts the thermal energy of fuels into mechanical work, as in bike or car engines. They run on seperate cycles Otto or Diesel or Dual etc. depending on fuel and other factors.
So basically the output is same from all the above, the cycles mentioned are also almost similar. But efficiency, fuel used, application varies.
E.g. On small scale like vehicles, we can't use turbines. So IC engines are solution. To harness the enormous potential energy of water at dams, hydraulic turbines are used. In gas power plants, gas turbines (sometimes in combination with steam turbines) are used to run the generators. In process plants, where steam is by product, steam turbines are used as prime movers to increase plant energy utilization efficiency. |
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