dynamic compressors Flashcards

1
Q

how to increase effieciency and capcity in single stage compressor

A

diffuser vanes fit to inside of the housing

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2
Q

increasing the speed in the single stage compressor will also increase the ______

A

volume

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3
Q

adding additional impellers also known as multistaging will have this effect

A

increase volume and overall pressure ratio

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4
Q

multistaging with intercooling between stages with 4-5 impellers can be achieved using this _____

A

bull gear

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5
Q

impeller is used to accelerate or decelerate

A

accelerate

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6
Q

volute and diffuser is used to accelerate or decelerate

A

decelerate

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7
Q

3 types of centrifugal casings

A

sectional
horizontally split
vertically split

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8
Q

casing usually on small units for low pressure ratio and small volumes

A

sectional

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9
Q

casing most easily removed and limited to less than 1000 psi

A

horizontally split

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10
Q

casing used for high pressure up to 10 000 psi

A

vertically split

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11
Q

3 types of impellers

A

open
semi closed
closed

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12
Q

impeller used in single stage and used in rough service environment

A

open

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13
Q

impeller used in single and multi stage or final stage stage in axial compressor. blades may be straight radial, backwards leaning

A

semi closed

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14
Q

impeller used in single and multi stage or final stage stage in axial compressor. enclosure of vanes allow you to achieve higher pressure ratio

A

closed

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15
Q

directs gas flow into the compressor or from one stage to the next

A

guide elements

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16
Q

controls compressor output and increase effieciency

A

inlet guide vanes

17
Q

stationary guides in a compressor

18
Q

result of the differential pressure between the impeller front and the back shroud

A

axial thrust

19
Q

thrust load is on this end of the compressor

A

suction end

20
Q

3 ways to minimize axial thrust

A

balance piston, thrust bearing, impeller arranged

21
Q

where is the balance piston located

A

discharge end immediately behind last impeller

22
Q

what end is the thrust collar installed

A

suction end

23
Q

impeller arrangement for high pressure

A

back to back

24
Q

impeller arrangement for maximum flow

A

double flow arrangement

25
seal used to prevent poisonous gas to escape to atmosphere
labrinth seal
26
seal used for high pressure
interlocking labrinth seal
27
seal used at low pressure
carbon ring seal
28
seal used where shaft speed is low
mechanical seal
29
term to describe rotor being supported by bearing at both ends
beam
30
3 parts of the axial compressor
rotor disc, stator and casing
31
simplest way of controlling axial compressor
varying the speed by using gas or steam turbine as a prime mover
32
2 types of axial rotors
drum and disc type
33
problem in dynamic compressor that occur from dirty gases
blade fouling
34
device used to inspect compressors
borescope
35
term for flow reversal, which causes pressure drop at discharge
surge
36
the term for when maximum flow has been reached
stonewall