1. An air flow with an initial Mach number of 1.5 and initial pressure p1 is expanded isentropically by passing through a deflection angle of 5° . Find the Mach number and pressure ratio after the deflection.
2. Air at Mach 3.0 is deflected through 20° by an oblique shock. What isentropic expansion turning angle is required to bring the flow back to
(a) The original Mach number.
(b) The original pressure?