5 Questions
What are the two methods used for cooling the flame-tube?
Using a corrugated ‘wigglestip’
Why is predicting the flame-tube temperature from an energy balance not accurate?
Due to varying emissivities
What is the effect of higher turbine inlet temperatures on the cooling potential of the air?
It reduces the cooling potential of the air
What is effusion cooling?
Using a porous material for cooling the flame-tube
What is the current state of development for combustion chamber design?
It is still a matter of trial and error on the test rig
Study Notes
- Cooling the flame-tube is a problem as permissible turbine inlet temperatures increase.
- The flame-tube receives energy by convection and radiation, but loses energy by convection and radiation as well.
- Leaving narrow annular gaps between overlapping sections of the flame-tube is a common practice for cooling it.
- Corrugated ‘wigglestip’ and a ring of small holes are two methods used for cooling the flame-tube.
- Prediction of the flame-tube temperature from an energy balance is not accurate due to varying emissivities.
- Final development of combustion chamber design is still a matter of trial and error on the test rig.
- The emissivity of the flame varies with the type of fuel.
- Higher turbine inlet temperatures imply the use of lower air-fuel ratios, which reduces the cooling potential of the air.
- If permissible turbine inlet temperatures increase much beyond 1500 K, effusion cooling may have to be used.
- Effusion cooling is more economical in cooling air than film cooling.
Do you know how to effectively cool a flame-tube in high temperature environments? Test your knowledge with this quiz! Explore the common practices and methods used for cooling flame-tubes, the challenges faced, and the impact of varying factors such as fuel type and air-fuel ratios. Discover the importance of effusion cooling and the ongoing trial and error process in combustion chamber design. Challenge yourself with technical concepts and see how much you know about this critical aspect of turbine technology.
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