Prepared by: Berk Demirgok

exhaustedcrumΜηχανική

24 Οκτ 2013 (πριν από 3 χρόνια και 7 μήνες)

76 εμφανίσεις

Prepared by:
Berk

Demirgok


Dept. of Electrical and Computer Engineering

Utah State University

3/15/2012


References



Overview



Types of compressors



Major applications



Purchasing





Fluid Mechanics: Fundamentals and
Applications
By
Yunus

A.
Çengel
, John M.
Cimbala

-

McGraw
-
Hill College

(2009
)


Introduction to

Fluid Mechanics

[Book]

by
Robert W. Fox, Philip J. Pritchard, Alan T.
McDonald



Mechanical
measurements by
Thomas G.
Beckwith, Roy D.
Marangoni
, John H.
Lienhard


Wikipedia





http://www.chem.queensu.ca/people/faculty
/mombourquette/firstyrchem/GasLaws/inde
x.htm
http
://
www.electronics
-
tutorials.ws/io/io_2.html


http://www.fscc
-
online.com/%22Passing%20Gas%22
-
article/passing_gas.html
http
://www.autonics.
com/products/products_2.php?big=01&mid=
01/06


https://engineering.purdue.edu/~
propulsi/pr
opulsion/jets/basics/comp.html


http://
knowledgepublications.com/doe/doe_
mechanical_science_web_educational_textbook
_solar_hydrogen_fuel_cells.htm



Compressors increases pressure on a fluid,
gasses with compressing gasses. With
increasing pressure, volume of gasses are
reduced by compressors. However, liquids are
incompressible and cannot be used as a fluid
for compressors.



Also, note that when compressors change the
pressure of a fluid, fluid’s temperature changes





Moreover, pumps are like compressors. They
both work in the same principle. However,
pumps can only transport the fluid.

http://www.aardvarkclay.com/catalog_p
ages/compressors.html


Compressibility helps us to measure volume
change of fluids as a reaction to change in
pressure.


𝑃

𝑉
=
𝑛

𝑅

𝑇

is the relation between
volume, pressure, unity and temperature. This
equation is called ideal gas law and we can use
it as a compressibility factor equation.


Compressibility factor equation is

𝑃

𝑉
=
𝑍

𝑅

𝑇




𝑃

𝑉
=
𝑛

𝑅

𝑇


𝑃

𝑉
=
𝑍

𝑅

𝑇


P is the pressure and its unit is Pa in SI units.

V is the volume and its unit is m^3.

N is the amount of substance of a gas and its unit
is mol.

R is the universal gas constant, 0.08206
L*
atm
*
mol
^
-
1*K^
-
1.

T is the temperature and its unit is K.

Z is compression factor for gasses.


For each type of fluid or gasses, they have their
own compression factors. Next slide shows z
factors for only air.


http://
www.chem.queensu.ca/people/
faculty/mombourquette/firstyrchem/G
asLaws/images/compressibility.gif


Turbo Compressors


Axial


Centrifugal


Displacement Compressors


Reciprocating


Rotary


Screw

http://www.refrigeratortroubleshoot.com
/refrigerating
-
compressors.html


Centrifugal Compressors are also called
annular compressors.



It uses a rotating impeller rotating with really
high speed to apply force on refrigerant into a
diffuser. Diffuser section converts the velocity
energy into pressure energy.


Advantages


Easy to design and fabrication


It generally rises the pressure enough for efficient
combustion with only one step without any
problems
.


Disadvantages


Less fuel efficiency


Pressure ratio is generally lower causing creating
less thrust.




http://www.georgiapower.com/energy_k
nowhow/images/c00090.gif


Working fluid goes through out parallel the
axis of rotation. However working fluid goes
vertical for centrifugal compressors.


Advantages


It creates higher flow rate and pressure so that
increases thrust and fuel efficiency.


High peak efficiency.


They large mass flow volume.


Disadvantages


Axial compressors are hard to built and costs a lot
of money to manufacture.


They weigh much higher than centrifugal
compressors.


In order to start axial compressors, it requires high
starting power.


Typical axial Compressor is shown below.


http://www.adl.gatech.edu/classes/prop
ulsion/prop12.html


Reciprocating compressors that the volume of
fluid is reduced by a movement of a piston
inside cylinder.


Rotary compressors that the volume of fluid is
reduced by rotation of some parts without
reciprocating or piston movement.


Reciprocating and rotary compressor


http://knowledgepublications.com/doe/i
mages/DOE_Mechanical_Science_Recipro
cating_Air_Compressor.gif

http://nuclearpowertraining.tpub.com/h1
018v2/img/h1018v2_86_1.jpg


Advantages


They are inexpensive.


They have very wide
-
range horsepower options.


Better mass flow rate.


Better efficiency.


Compressors are widely used in our world.
Some of the application areas are:


Medical use


Welding use


Aircrafts


Air conditioner


Pipeline transport


Rail transport


Automotive
Industry




Price range is very different for each type of
compressor. You can reduce your cost by
thinking buying used compressors.


There are some good online stores to buy
compressors.


www.air
compressors
direct.com


www.lowes.com


www.compressor
.pronto.com


www.northerntool.com