Page 171 - Mechanical Engineer's Data Handbook

160 MECHANICAL ENGINEER'S DATA HANDBOOK

4.5.4 Aircraft jet engine

Let :
V= jet velocity relative to aircraft
U = aircraft velocity
m=mass flow rate of air
hf = mass flow rate of fuel
Thrust T=mU - (m +mf)V
Output power P= TU=mU2-(m+mf)UV

r
Side entry

l.OL--- - -

I/ I I

0 0.5 1 .o
r
Front entry
vz
Po mar =m -, at r =0.5.
4

4.6 Flow of gases

Formulae are given for the compressible flow of a gas. pipe and flow through orifices. The velocity of sound in
They include isothermal flow with friction in a uniform a gas is defined.

Symbols used: VI =inlet velocity
p = pressure R =gas constant
L = pipe length m = mass flow
D = pipe diameter f= friction coefficient
T= temperature y = ratio of specific heats
C, =discharge coefficient p = density