Aerothermal Propulsion

1
Aerothermal Propulsion

• Lecture 36
• Compressor theory

2
Agenda

• History of impellors and compressors
• Propeller theory
• Compressor Operating speed

3
Propellers
Late Middle ages
4
Wind turbines
Note area is increased
5
Steam turbine
1900
6
bellows
7
Archimedies screw
8
propeller
1776 -Turtle
Da vinci 1500
9
Aeropropellers
1843 Cayely
10
bellows
Mid 1800s
11
bellows
bellows
blower
12
turbocharger
13
Turbocarger
turbine
compressor
14
Turbochargers p-38
15
First Tractor Pull
VS
                                                
                    In 1848 HMS Alecto ( paddle
wheels) HMS Rattler (
propellers)
16
tubrofan
17
Propeller sections
18
Propeller Theory
19
Propeller Theory
20
(No Transcript)
21
Propeller Theory
22
Propeller Theory
?1
?2
?
23
Average Pitch
24
Separation
airfow
Rotation too slow Bottom separation
rotation
25
Separation
airfow
rotation
Rotation just right Maximum thrust
26
Separation
airfow
rotation
Rotation too fast top separation
27
Compression Stage
Rotor
2.
1.
3.
w2
?2
?1
?2
c2
U
w2
w1
?3
U
c3
U
c2
c1