Dissociation in IC Engines and Gas Turbines

 Dissociation in IC Engines and Gas Turbines refers to the breakdown of molecules into simpler molecules or atoms at high temperatures, which affects combustion efficiency and performance.

1. Dissociation in IC (Internal Combustion) Engines:

   - During the combustion process in IC engines, at high temperatures (above 2000°C), the chemical bonds in combustion products (such as CO₂ and H₂O) begin to break down into their constituent elements (e.g., CO, O₂, H₂).

   - This phenomenon reduces the amount of heat released because the energy that could have been used for power is absorbed in breaking these chemical bonds.

   - As a result, dissociation leads to a decrease in combustion efficiency and overall engine performance.

   - It can also affect exhaust emissions by increasing the formation of pollutants like CO and NOₓ.

2. Dissociation in Gas Turbines:

   - Similar to IC engines, gas turbines operate at very high temperatures. In gas turbines, combustion occurs at extremely high temperatures (up to 1500°C or higher), which can cause the dissociation of combustion products (like CO₂ and H₂O).

   - The dissociation limits the maximum temperature in the turbine because if the temperature is too high, more energy is absorbed in breaking molecules apart, reducing the energy available for mechanical work.

 NOTE   - Managing the temperature is crucial to ensure efficient turbine performance while minimizing dissociation losses.

   

In both IC engines and gas turbines, dissociation is undesirable because it reduces thermal efficiency, and therefore, these systems are designed to operate below the temperatures where dissociation becomes significant.