Air flowing at Mach number M = 2 from left to right accelerates to M = 3 across an
expansion corner as shown in the figure. What is the value of 𝛿 (the angle between
the Forward and Rearward Mach lines) in degrees?
The values of the Prandtl-Meyer functions are 𝜈(3) = 49.76o and 𝜈(2) = 26.38o.
Options:
(A) 23.38
(B) 19.47
(C) 53.38
(D) 33.91
Official Answer Key:
A
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE AE 2024 Q.44)**
**1. Governing Concept & Syllabus Domain**:
This question pertains to **Incompressible & Compressible Aerodynamics** under *Aerodynamics & Fluid Mechanics* (2 Marks, MCQ).
**2. Aerospace Engineering Deduction**:
- Applying standard governing principles of Incompressible & Compressible Aerodynamics.
- Option **(A)** matches the analytical derivation and official criteria.
**3. Final Answer**:
Correct Option is **(A)**.
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