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Modern jet engine turbines: each blade a single crystal (2015)

americanscientist.org

11–20 of 34 posts

Re: Modern jet engine turbines: each blade a single crystal (2015)

#11
post #4

Lots of trade secrets there. I wonder how many of them the BigAI companies have already collected.

Considering most of those trade secrets are sitting in peoples heads or in documentation behind walls AI companies have yet to get over, not many.

I think the issue would be mainly that people fail to realize the nature of what they're corresponding with, and take things from inside their heads and behind the walls, and put them into the chat?

I hope you're right though.

Re: Modern jet engine turbines: each blade a single crystal (2015)

#13
post #11

Earlier quoted context omitted.

Considering most of those trade secrets are sitting in peoples heads or in documentation behind walls AI companies have yet to get over, not many.

I think the issue would be mainly that people fail to realize the nature of what they're corresponding with, and take things from inside their heads and behind the walls, and put them into the chat? I hope you're right though.

No one is "corresponding" trade secrets outside of their company. I recommend reading up on ITAR and the resulting culture it has created around aerospace info.

Re: Modern jet engine turbines: each blade a single crystal (2015)

#15
post #3

(2015) "With recent decreases in the price of natural gas..."

Natural gas in the US is so cheap, producers have to pay to get rid of it. However there's not enough transport hubs in the US to export it to places that needed it, although several companies have recently announced a pivot from wind energy to natural gas ports. (Wish they'd do both.)

Re: Modern jet engine turbines: each blade a single crystal (2015)

#16

Efficiency was mentioned a few times, but without any hard numbers. What was the state of the art efficiency over time from a 1940s design to today? Have improvements plateaued or is there still a lot of theoretical gains on the table?

This might be interesting: https://www.nationalacademies.org/read/23490/chapter/6

Thermodynamic efficiency (which is what turbine blades enable) has increased from ~30 to 55% over the last 50-60 years. The book estimates that the practical limit of for thermodynamic efficiency is in the 65-70% range.

Re: Modern jet engine turbines: each blade a single crystal (2015)

#18
post #11

Earlier quoted context omitted.

I think the issue would be mainly that people fail to realize the nature of what they're corresponding with, and take things from inside their heads and behind the walls, and put them into the chat? I hope you're right though.

No one is "corresponding" trade secrets outside of their company. I recommend reading up on ITAR and the resulting culture it has created around aerospace info.

Note that google cloud has an itar-compatible gemini pro and google drive / docs - so, people do talk to it - and google is of course contractually obligated to not export it, nor to learn from it.

This is very different that AWS fed-gov bedrock thingie - where AWS promises that the models are running on hardware dedicated to you, with no external logging, etc.

Re: Modern jet engine turbines: each blade a single crystal (2015)

#19

Efficiency was mentioned a few times, but without any hard numbers. What was the state of the art efficiency over time from a 1940s design to today? Have improvements plateaued or is there still a lot of theoretical gains on the table?

This might be interesting: https://www.nationalacademies.org/read/23490/chapter/6 Thermodynamic efficiency (which is what turbine blades enable) has increased from ~30 to 55% over the last 50-60 years. The book estimates that the practical limit of for thermodynamic efficiency is in the 65-70% range.

Great resource, thanks.

Re: Modern jet engine turbines: each blade a single crystal (2015)

#20

Earlier quoted context omitted.

No one is "corresponding" trade secrets outside of their company. I recommend reading up on ITAR and the resulting culture it has created around aerospace info.

Note that google cloud has an itar-compatible gemini pro and google drive / docs - so, people do talk to it - and google is of course contractually obligated to not export it, nor to learn from it. This is very different that AWS fed-gov bedrock thingie - where AWS promises that the models are running on hardware dedicated to you, with no external logging, etc.

> google cloud has an itar-compatible gemini pro and google drive / docs - so, people do talk to it

A lot of aerospace engineering is touch and feel. Someone has a "sense" for when to do the next step, and how to finagle the part so it comes out a particular way. They can train someone, if they apply themselves intently. But they probably couldn't explain it in words if they tried.

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