Heat distortions in Blender are a fantastic atmospheric effect that can really help sell the realism of any shot containing excessive heat. From lava to jet engines, this method will help you replicate realistic heat distortions in no time!
Spitfire Mk IXe model and textures courtesy of martinsifrar on Sketchfab.
https://sketchfab.com/models/4bfb316cfc65457e9bc97346b3ccf591