AAE 334 Final Exam Concepts || Already Graded A+.
If you take a supersonic stream and turn it at an angle, what will you generate? How can you
make this effect stronger? correct answers An oblique shock, a bigger turning angle
Velocities across the face of a shock (tangential velocity) dont change across the shock. correct
answers True.
What is the theta - Beta - M chart used for? correct answers theta - deflection angle
beta - shock wave angle
M - Mach upstream of shock
If you have 2 out of three of these variables, you can use the chart to solve for the third unknown
parameter.
As deflection angle increases, shock wave angle increases for a weak shock. correct answers
True. (See TBM charts)
Larger Mach numbers are associated with larger deflection angles and relatively lower shock-
wave angles. correct answers True. (See TBM charts)
If we try to turn a supersonic free-stream beyond its max sonic limit, what happens to the shock?
correct answers It becomes a strong detached shock.
The upper limit of the TBM chart when the shock wave angle approaches 90 degrees is
considered.... correct answers a normal shock
A low back pressure is associated with a strong shock. A high back pressure is associated with a
weak shock. correct answers Incorrect.
Low back pressure = Weak shock
High back Pressure = Strong Shock
A weak shock solution is usually associated with a supersonic flow behind it, but can have a
subsonic flow behind it if we are close to the maximum turning angle. correct answers True.
A strong shock solution always has supersonic flow behind it. correct answers False, it always
has subsonic flow behind it.
LECTURE 27 correct answers 27
You will generally see a much larger total (especially stagnation) pressure loss going through a
normal shock than an oblique shock. correct answers True.
If the turning angle is too large for the reduced Mach number behind an oblique shock, what is
the result? correct answers A Mach Reflection / Slip Line
If you take a supersonic stream and turn it at an angle, what will you generate? How can you
make this effect stronger? correct answers An oblique shock, a bigger turning angle
Velocities across the face of a shock (tangential velocity) dont change across the shock. correct
answers True.
What is the theta - Beta - M chart used for? correct answers theta - deflection angle
beta - shock wave angle
M - Mach upstream of shock
If you have 2 out of three of these variables, you can use the chart to solve for the third unknown
parameter.
As deflection angle increases, shock wave angle increases for a weak shock. correct answers
True. (See TBM charts)
Larger Mach numbers are associated with larger deflection angles and relatively lower shock-
wave angles. correct answers True. (See TBM charts)
If we try to turn a supersonic free-stream beyond its max sonic limit, what happens to the shock?
correct answers It becomes a strong detached shock.
The upper limit of the TBM chart when the shock wave angle approaches 90 degrees is
considered.... correct answers a normal shock
A low back pressure is associated with a strong shock. A high back pressure is associated with a
weak shock. correct answers Incorrect.
Low back pressure = Weak shock
High back Pressure = Strong Shock
A weak shock solution is usually associated with a supersonic flow behind it, but can have a
subsonic flow behind it if we are close to the maximum turning angle. correct answers True.
A strong shock solution always has supersonic flow behind it. correct answers False, it always
has subsonic flow behind it.
LECTURE 27 correct answers 27
You will generally see a much larger total (especially stagnation) pressure loss going through a
normal shock than an oblique shock. correct answers True.
If the turning angle is too large for the reduced Mach number behind an oblique shock, what is
the result? correct answers A Mach Reflection / Slip Line
