Jet Engine: Turbine Blades and Temperature

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SUMMARY

The discussion focuses on the environmental conditions and material requirements for turbine blades in jet engines, specifically referencing the Rolls-Royce Trent 800 engine. Turbine blades must withstand extreme temperatures, reaching up to 2000°F, and must be made from advanced materials such as Inconel 718, Inconel 738, and CMSX-4 superalloys. Key properties of these materials include stiffness, yield stress, and resistance to thermal fatigue. The conversation also highlights the importance of design features like cooling vents to manage heat and prevent stress cracks.

PREREQUISITES
  • Understanding of turbine engine mechanics
  • Familiarity with materials science, particularly superalloys
  • Knowledge of thermal dynamics in high-temperature environments
  • Basic principles of fluid dynamics related to gas flow in engines
NEXT STEPS
  • Research the properties and applications of CMSX-4 superalloy
  • Study the manufacturing processes for single crystal turbine blades
  • Explore the effects of thermal fatigue on turbine blade materials
  • Investigate the cooling techniques used in turbine blade design
USEFUL FOR

Aerospace engineers, materials scientists, and students in aviation technology will benefit from this discussion, particularly those focused on turbine engine design and performance optimization.

  • #31
Look at my item #2 again. This is a very specialized area especially in the design and manufacturing end. There are many proprietary designs and processes involved. The technical knowledge in many cases is not found in book and must be learned through experience. Start ups in other countries will not have that and will have a huge learning curve to make up for.
 
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  • #32
mgb_phys said:
...building a jet aircraft isn't too tricky.
Ummm...
 
  • #33
quick quesion:
In terms of technical know-how and technological capabilities in the field of material science, is there any similarity between jet vanes used for thrust vectoring of rockets and the turbine blades in jet engines?
Are the two related to each other at all or are they completely irrelavant?
Which one is more sophisticated?
Would the capability to make one "imply" the capability to make the other?
 
  • #34
FredGarvin said:
Ummm...

Compared to a nuke, nuclear powered subs, satelite launchers, cars capable of more than 20mpg and other stuff that 'backward' countries like India and China are capable of.
 
  • #35
Soorena said:
quick quesion:
In terms of technical know-how and technological capabilities in the field of material science, is there any similarity between jet vanes used for thrust vectoring of rockets and the turbine blades in jet engines?
Are the two related to each other at all or are they completely irrelavant?
Which one is more sophisticated?
Would the capability to make one "imply" the capability to make the other?
Rockets usually used gimbled rocket motors or small rocket motor to 'steer' the rocket. Control surfaces on aircraft and some rockets are made of the lighest possible material and usually do not operate at high temperature - except for those vehicles traveling well beyond supersonic. By contrast turbine blades in a jet engine operated at very high temperatures.

There is a great deal of 'art' in perfecting an alloy composition that retains high strength, toughness and creep resistance at high temperature.


China and India are not backward countries. They have considerable expertise in many high tech areas.
 
  • #36
Astronuc said:
Rockets usually used gimbled rocket motors or small rocket motor to 'steer' the rocket. Control surfaces on aircraft and some rockets are made of the lighest possible material and usually do not operate at high temperature - except for those vehicles traveling well beyond supersonic. By contrast turbine blades in a jet engine operated at very high temperatures.

There is a great deal of 'art' in perfecting an alloy composition that retains high strength, toughness and creep resistance at high temperature.


China and India are not backward countries. They have considerable expertise in many high tech areas.

Thanks for the reply.
However I am pretty sure that apart from gimbled engines, "jet vanes" too are used for steering. Some times graphite and sometimes graphite reinforced ceramic composite jet vanes are used.
If you google the phrase "graphite reinforced ceramic composite jet vanes" you will find a blog which is about proliferation control. Over there they talk about advanced composite material jet vanes which are used to steer rockets.
The blog is contributed to by rocket scientists so it is fairly reliable in terms of technical information as far as rockets go.
So I am sure that jet vanes are used for steering rockets and I was just wondering if the technology for making such composite material is related to the technology of making turbine blades?
If there is any similarity in between, would the technical know-how as to make one imply the ability to make the other? or are they completely unrelated to each other?
 
  • #37
To Astronuc:

By the way the graphite reinforced ceramic which is used for making jet vanes (in general ANY materials used for making jet vanes for the purpose of steering the rockets) has to be able to withstand EXTREME temperatures and very harsh environment.
 
  • #38
Look up the German V-2. It used graphite vanes for thrust vectoring. It has to have been reused since then.

The black shapes in the attached picture are the vanes:
infopic05.jpg
 

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