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hey these people want to slow down the velocity to eliminate "jet effect" (thrust) from the exhaust of a turbine generator:
Perhaps the most important part of the entire power train is the expansion bellows. Since there is very little practical difference between a gas turbine and a jet engine, the expansion bellows employs Bernoulli's principle to decrease exhaust gas velocity and therefore eliminate jet effect at the turbine exhaust. Without this expansion bellows, the turbine would impart undue thrust against the remainder of the unit. The exhaust gases are now at approximately 1000o F., and are routed by the exhaust bellows into the second section of the train, where thermal energy will be extracted by the heat recovery system
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