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Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Seventh semester B.Tech examinations (S), September 2020

Course Code: ME409
Course Name: COMPRESSIBLE FLUID FLOW
Max. Marks: 100 Duration: 3 Hours
Use of Gas table is permitted. Assume suitable value for missing data
PARTA
Answer any three full questions, each carries 10 marks. Marks

1 8) Derive an expression for sonic velocity in medium in terms of the ratio of (4)
specific heats and difference of specific heats of the medium.

b) Show that for air at sonic flow condition, the deviation between the (6)
compressible and incompressible flow values of the pressure coefficient of a
perfect gas is about 27.5 percent.

2 93) A Schlieren photograph showing a wave front by a bullet moving in air gavea (4)
Mach angle of 40°. Find the speed of the bullet if the pressure and temperature
of atmosphere are 0.95 bar and 2௦.
0) Derive steady flow adiabatic ellipse equation. Represent various flow regimes (6)

on steady flow adiabatic ellipse.

3 a) 50 (4)

Find the maximum value of mass flow parameter — for (i) air (11) carbon

0

dioxide at 273 K.

ಹಾ

b) 44 dp ; (6)
1-47
pc ( )

Derive the relation for one-dimensional isentropic flow — ‏ے۔ ے‎
A

4 A gas is isentropically expanded from a pressure of 10 bar and temperature of (10)
525 °C in a nozzle to a pressure of 7.6 bar. If the rate of flow of the gas is 1.5
kg/s determine
i) pressure, temperature and velocity at the nozzle throat and exit
ii) maximum possible velocity attainable by the gas
iii) throat area

Take y = 1.3 and R= 0.464 kJ/kgK
PARTB

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