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I'm interested in learning what the proper (more accepted) notation used to label sensors present in turbo-jet engines is.

Came across a few examples such the ones shown below but would like to learn if there is a 'standardized' methodology.

temperature and pressure notation Temperature and pressure notation

speed notationSpeed Notation

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Sensors are identified in your picture by either P or T, for pressure or temperature, and the engineering station number.

Station numbering is standardized in SAE ARP 755: SAE Aerospace Recommended Practice 755 - Turbine Engine Performance Station Numbering. As you find yourself this standard has been extended to SAE AS 755 - Aircraft Propulsion System Performance Station Designation to take into account more complex engines

The main stations for a turbojet are:

enter image description here

Additional stations are used, e.g. for a turbofan. :

enter image description here

Source.

These numbers are used, for example, in this temperature-entropy diagram:

enter image description here

Source.

You can see the raise of temperature by the combustor between {3} and {4}. See this answer for explanations.

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    $\begingroup$ ARP755 has been superseded by AS755F [sae.org/standards/content/as755f ] $\endgroup$
    – user67034
    Nov 2, 2023 at 22:03
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    $\begingroup$ @user67034: Good find, I edited my answer to include this extension. $\endgroup$
    – mins
    Nov 2, 2023 at 22:22

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