Lecture F19 Mud: Quasi-1D-Flow 1. Why was h o constant? (1 student) The ﬂow is assumed to be adiabatic (no heat addition via combustion, etc). The ﬂow is also assumed to be frictionless, so o and p o are constant as well. 2. Why did M increase linearly in the PRS question? (1 student) I just declared that it was. The objective was then to deduce the duct area A ( x ) which would generate this given linear M ( x ) distribution. 3. Which way will the ﬂow go after the sonic throat? Will it go back to subsonic ( M < 1 ), or go to supersonic ( M > 1 )? (1 student) It depends on what pressure is imposed at the very exit. If the exit pressure is low enough, the ﬂow will accelerate to supersonic after the throat. Otherwise, it will stay subsonic. We’ll cover this in the next (and last) lecture. 4. What would happen if you try making A < A ? (1 student) This would force a reduction in the channel mass ﬂow m , which would in turn decrease A ˙ to be equal to or less than the new minimum A . Ya can’t trick it. 5. What properties determine the boundary
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This note was uploaded on 01/28/2012 for the course AERO 16.01 taught by Professor Markdrela during the Fall '05 term at MIT.