10

11

12

13

14

b)

a)
b)

a)

b)

a)

b)

00000ME409121903

Derive the following relations for Fanno flow (i) ब and (ii) =

०५
Air at an inlet temperature of 60°C flows with subsonic velocity through an
insulated pipe having inside diameter of 50 mm and a length of 5m. The pressure
at the exit of pipe is 101kPa and the flow is chocked at the end of the pipe. If the
mean friction factor is 4f=0.005, determine the inlet Mach number, exit
temperature and the mass flow rate.
PART C

Answer any four full questions, each carries 10 marks.
Explain the process of thermal chocking in Rayleigh flow.
Citing suitable examples explain the Rayleigh flow.
Derive an expression for maximum possible heat transfer in Rayleigh flow in
terms of Mach number.
Air fuel mixture enters a combustion chamber with an initial velocity of 150
m/s, pressure of 4 bar and temperature of 410K. The Mach number at the exit of
the combustion chamber is 0.8. (Take y=1.3, Cp=1.14 kJ/kg K, calorific value of
fuel as 43 MJ/kg.) find 1) The entry Mach number ii) Stagnation pressure loss
iii) Exit temperature and pressure iv) Air-fuel ratio
List different temperature measurements employed in supersonic flow. Explain
any two with neat sketches.
Why do investigators prefer to use thermocouple for the temperature
measurements in high velocity streams?
With the neat sketch explain a closed circuit supersonic wind tunnel indicating
all the relevant components. Why the design of diffuser throat area is made
larger than the nozzle throat area in supersonic tunnels.
Explain how the Pitot tube could be used in compressible flow to measure the
Mach number in supersonic flow.

With the help of neat sketch explain the working of interferometer.

Page 2of 2

(4)

(10)

(4)
(6)
(10)

(10)

(6)

(4)

(10)

(4)

(6)