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B733 Reversers

LMML 14/32 From Malta, joined Jan 2001, 2559 posts, RR: 7
Posted (10 years 11 months 3 weeks 3 days 14 hours ago) and read 803 times:

Question: When the B733 reversers are applied is it just the bypass air that is blocked?

7 replies: All unread, jump to last

Buzz From United States of America, joined Nov 1999, 697 posts, RR: 24
Reply 1, posted (10 years 11 months 3 weeks 3 days 8 hours ago) and read 780 times:

Hi Lmml 14-32 (wonder what runway that is?) Buzz here. You're right, on the "super guppy" only the fan airflow is blocked. Seems that the turbine airflow is more trouble than it's worth.

On the Classic 747 and DC-10 we deactivated the turbine (core, hot section) reversers 20 years ago. They would often get a bunch of cooked turbine oil in them an jam anyway. And there was enough reverse thurst available from the fan to do the job.

g'day
Buzz Fuselsausage: Line Mechanic by night, DC-3 Crew chief by choice

LMML 14/32 From Malta, joined Jan 2001, 2559 posts, RR: 7
Reply 2, posted (10 years 11 months 3 weeks 2 days 15 hours ago) and read 724 times:

This means that as the thrust is reversed in the bypass area the combusted area is still producing forward thrust. Does not make much sense. There must be another explanation.

LMML 14/32 = MALTA (MLA) N35 E14

KFRG From , joined Dec 1969, posts, RR:
Reply 3, posted (10 years 11 months 3 weeks 2 days 10 hours ago) and read 704 times:

LMML 14/32,
To activate TR, the fan's must be at idle.

-Tommy

Bio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 4, posted (10 years 11 months 3 weeks 2 days 5 hours ago) and read 673 times:

There's not another explanation. Turbofan engines, opposite to turbojets, have a high bypass ratio (8:1 or so) which means almost 8 times as much air passing through combustion is bypass air. Turbofans generate most of their thrust with the 'cold air' rather than with the 'hot air', so it is adequate to use the bypass air for reverse thrust. On 'bucket' type reversers the whole thrust is diverted.

On the 737-200 (although I believe these are torbojets)

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Photo © Nigel O. Prince

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On the 717-200

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Photo © Marc Sauthier

Good looking aircraft the 717...

-bio

Wilcharl From United States of America, joined Jun 2000, 1158 posts, RR: 3
Reply 5, posted (10 years 11 months 3 weeks 2 days 4 hours ago) and read 672 times:

The pratts on the 737 are turbofans.. not high bypass turbofans like the BR-715 but still a turbofan none the less

LMML 14/32 From Malta, joined Jan 2001, 2559 posts, RR: 7
Reply 6, posted (10 years 11 months 3 weeks 1 day 12 hours ago) and read 647 times:

Wow ! As much as 8 times as much bypass air. Amazing. In that case what Buzz said comes into perspective. This begs another question. Does reverse thrust operate all stages of the engine?

NKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 6
Reply 7, posted (10 years 11 months 3 weeks 1 day 5 hours ago) and read 612 times:

I'm not completely sure of your "all stages" reference. But yes, the engine core's internal gaspath is unchanged during use of T/R's. As has been said, it is only fan air that is blocked and directed fwd through cascade vanes.

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