Chengjoo, speaking as a former A2 QFI and the father of someone doing an Aerospace Engineering degree, may I refer you to the excellent ''Aircraft Flight'' by Barnard and Philpott (ISBN 0-582-00338-5). It explains all the stuff your theory won't neccessarily give you insight, for example - your original question. My copy (edition 1) even has a picture of a Vulcan approaching with it's airbrakes out!
PS. Don't try to click to look inside - the link doesn't work.