Cutaway of the annular combustion chamber on a <a href="https://en.wikipedia.org/wiki/Pratt_%26_Whitney_JT9D" class="extiw" title="en:Pratt &amp; Whitney JT9D">Pratt &amp; Whitney JT9-7D</a> turbofan engine. The air flow is from left to right.
<p>Discrete fuel injectors maintain flame zones which share a common ring (annulus) casing.
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This engine is part of the exhibit of the <a href="https://en.wikipedia.org/wiki/Deutsches_Museum" class="extiw" title="en:Deutsches Museum">Deutsches Museum</a>.
<a href="//commons.wikimedia.org/wiki/User:Ariadacapo" title="User:Ariadacapo">Olivier Cleynen</a>
<span class="int-own-work" lang="en">Own work</span>