Which of the following is a type of Gas Turbine Plant?

Question

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Option C: Open

Explanation & Concepts:
Gas turbine plants are classified based on the flow cycle into open-cycle and closed-cycle systems. An open-cycle gas turbine plant takes in atmospheric air, compresses it, combusts fuel within the air stream, expands the resulting hot gases through a turbine, and exhausts them directly to the atmosphere.

Working Principle: In an open-cycle gas turbine plant, air is drawn from the atmosphere by a compressor. This compressed air enters the combustion chamber where fuel is injected and ignited at constant pressure. The resulting high-temperature, high-pressure gas expands through the turbine to generate work, after which it is exhausted into the environment, making it a non-recirculating process.

Key Formulas: $W_{net} = W_t - W_c$ — Total net work output of the cycle; $\eta_{thermal} = \frac{W_{net}}{Q_{in}}$ — Thermal efficiency of the gas turbine plant

Key Points: Open cycle plants are simpler and cheaper compared to closed cycle plants.; The Brayton cycle is the theoretical thermodynamic cycle for gas turbine plants.; Air is taken as the working fluid in open cycles, while specific gases like Helium or Argon are used in closed cycles.

Advantages: Low capital cost compared to steam power plants.; Quick starting time from cold condition.; Requires less floor space.

Disadvantages: Lower overall thermal efficiency.; High exhaust gas temperatures lead to significant energy loss.; Sensitive to changes in ambient air temperature and pressure.

Applications: Peaking power plants in electrical grids.; Aircraft propulsion (Jet engines).; Combined Cycle Power Plants (CCPP).

Additional Info: Single Acting and Double Acting are terms primarily used for reciprocating engines or pumps, not gas turbines.. Closed-cycle systems recirculate the working fluid, allowing for the use of external combustion or nuclear heat sources.

Answer: C is correct — An Open-cycle gas turbine plant is a standard configuration where atmospheric air is continuously taken in, heated, and exhausted.

Exam Tip: Always distinguish between thermodynamic cycles (Brayton for gas, Rankine for steam) as this is a frequently tested concept in thermal engineering.

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Option A: Single Acting

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Option B: Double Acting

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Option D: None of the mentioned

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