This preview shows pages 1–2. Sign up to view the full content.
Chapter 7: LIFT
(1) Problem 7.115 from White
(take
ρ
of air at 10 km to be = 0.4125 kg/m
3
)
(2) Problem 7.120 from White
(hint: maximum lifttodrag ratio occurs when d/dC
L
[L/D] = 0
Chapter 9:
(3a) Show that the ratio of dynamic pressure (1/2
ρ
V
2
)
to static pressure (p =
ρ
RT) at
M=1 is k/2
(3b) Show that the ratio of kinetic energy per mass (1/2 V
2
) to internal energy per mass (u =
c
v
T) at M=1 is (1/2)k(k1)
(4) Given:
Aircraft in flight with stagnation pressure at nose p
0
= 44.3 kPa (abs) and
undisturbed p = 27.6 kPa (abs) and T = 50
o
C.
Find
:
a)
Mach number
b)
Air speed of the aircraft
Assumptions
:
(1)
Air behaves as an ideal gas, k=1.4
(2)
Constant specific heats
(5)When a fixed mass of air is heated from 20
o
C to 100
o
C, please write down the
equations for calculating;
(a)
change in enthalpy
(b)
change in entropy for a constant volume process
(c)
change in entropy for a constant pressure process
(d)
change in p for an isentropic process
(e)
change in
ρ
for an isentropic process
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview. Sign up
to
access the rest of the document.
 Summer '09
 Rohr

Click to edit the document details