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Enrolment No.
Subject Code: 2180105
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019
Subject Name: High Speed Aerodynamics
Time: 10:30 AM TO 01:00 PM
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Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Define Hypersonic flow in technical language. 03
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(b) What is the difference between aerothermodynamics and aerodynamics? 04(c) Explain construction of subsonic open type wind tunnel with neat sketch. 07
Q.2 (a) Prove Cp=2sin2? for Newtonian theory. 03
(b) Consider an infinitely thin flat plate at an angle of attack of 15° in a mach 8 flow. Calculate lift to drag ratio. 04
(c) Explain Solid blockage and wake blockage. 07
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OR(c) Explain Centrifugal force corrections to Newtonian theory with neat sketch. 07
Q.3 (a) Define wind tunnel balances. 03
(b) Air is travelled over the object with 12 Mach flow and shock angle is 2°(P) free stream pressure consider 101325 pa. Estimate downstream pressure (P2). 04
(c) Prove L/D = Cota 07
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ORQ.3 (a) List out flow visualization techniques: 03
(b) What is the difference between supersonic and hypersonic wind tunnel? 04
(c) Explain e-ß-M diagram with neat sketch and prove “Hypersonic limit for a slender wedge, the wave angle is only 20% larger than the wedge angle”. 07
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Q.4 (a) What is Tangent cone-method? 03
(b) Explain Shock expansion method. 04
(c) Explain Aerodynamic heating. 07
OR
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Q.4 (a) With neat sketch explain thin shock layer. 03
(b) Define and explain entropy layer. 04
(c) An object immersed in airflow is described as follows: Static pressure = 200 Kpa, Static Temperature = 293 K, Velocity of flow is 250m/s, Estimate stagnation temperature and stagnation pressure. 07
Q.5 (a) Define “High temperature flow” characteristic for hypersonic flow. 03
(b) Explain Low density flow. 04
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(c) Consider a flat plate at a 5° angle of attack in a mach 2.2 flow. Using prandtl meyer functions find out exit mach number. Take gama(?) = 1.4 07OR
Q.5 (a) Explain flow over an airfoil case for hypersonic case. 03
(b) Difference between supersonic flow and hypersonic flow. 04
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(c) Why car is not fly at Subsonic, Supersonic and hypersonic speed? 07Date:13/05/2019
Total Marks: 70
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