{TAIL ~ An exhaust annular gap} is formed between the intermediate and outer cylinders such that {HEAD ~ hot exhaust gases} flow through the exhaust annular gap and heat is transferred from the hot exhaust gases to the cathode air stream 
{ TAIL ~ An exhaust annular gap } is formed between the intermediate and outer cylinders such that { HEAD ~ hot exhaust gases } flow through the exhaust annular gap and heat is transferred from the hot exhaust gases to the cathode air stream
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