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As the above question stated, the upper and lower section of the combustor isn't same. Is there any reason behind it? Due to which the cooling of the combustor is also different in the upper and lower section of the combustor. The below picture clearly depicts it:

enter image description here

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  • $\begingroup$ In order to keep the outer diameter constant, the diffusor expands the airflow more towards the center since there is plenty of space available. $\endgroup$
    – Peter Kämpf
    May 25, 2021 at 18:33

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That drawing in the question is not really representative, here's a CFM56 combustor:

enter image description here
— faa.gov

The bulge the artist used, is actually a turn/inclination for aligning the combustor with the more outboard first stage turbine.

Here's a more gentle turn in a bigger engine:

enter image description here
— Flight International

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