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I want to know what is the temperature of the engine mounts in modern turbofan engines for example, Rolls Royce Trent 900. Also, what are the temperature considerations you need to make while designing a pylon?

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This is an order of magnitude educated guess:

Based on this picture from Wikipedia: enter image description here You can see that the aft mount is attached to the turbine rear frame. As such, it'll get relatively toasty. I'd say maybe 900 - 1000 F.

The forward mount is attached to the fan frame just above the compressor case. As such, it will be much cooler. Maybe 200 - 300 F.

Again, that's just an educated guess. I'm not aware of any publicly available data.

Edit:

in response to the comment, no it's not the big red box at the front. That's approximately where the forward mount would be in a typical Boeing style engine, but Airbus does it a little differently. In the below, I found an image of a model of the pylon (from here), and showed where the pylon meets up with the engine. The left most line points to the aft mount, the middle line to the forward mount, and the forward line meets up with the inlet (not a mount, just to show you how it lines up). The top orange bar in the engine picture, and the lower white bar in the pylon picture are ground support equipment. Would be removed when the engine is attached to the pylon.

Pylon

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  • $\begingroup$ Actually, I can't see where the fore and aft mounts are. Could you edit a description in of what I should be looking for? Is it the big red box up front and where the orange bars meet at the rear? $\endgroup$ – FreeMan Jul 22 '20 at 21:26
  • $\begingroup$ @FreeMan: "I can't see where the fore and aft mounts are", perhaps more visible here :-) $\endgroup$ – mins Jul 27 '20 at 17:33
  • $\begingroup$ @mins, very good post, I upvoted, although that's mostly describing Boeing mounts, and OP here asked about Trent 900 which is on the A380. Aft mounts are fairly similar, but Airbus has a slightly different mounting style for the forward mount. $\endgroup$ – Daniel K Jul 27 '20 at 17:39

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