ChE 123: Applications of Thermodynamics to Flow Processes

Question 1

attached to the rotating shaft and convert fluid energy into mechanical work

Answer 1

rotor blades

Question 2

it is the moving blades

Answer 2

rotor blades

Question 3

it is is the maximum work that can be obtained from the ideal turbine with the given inlet conditions and discharge pressure

Answer 3

isentropic

Question 4

it is defined as the ratio of the actual work output and the ideal (isentropic) work output

Answer 4

isentropic efficiency

Question 5

To conserve the _________________, the stator section reduces pressure and temperature while increasing velocity

Answer 5

total energy

Question 6

The flow energy of the fluid converts into the ___________________ causing the rotor blades to rotate

Answer 6

mechanical energy

Question 7

two components of turbine

Answer 7

1. rotor blades
2. stator blades

Question 8

a device that increases the pressure of a fluid by doing work on it

Answer 8

compressors

Question 9

it is the nozzles

Answer 9

stator blades

Question 10

where will the fluid be passed through to increase its velocity again?

Answer 10

stator blades (nozzles)

Question 11

For an ideal case, the fluid that passes in the turbine expands?

Answer 11

reversibly and adiabatically

Question 12

As the rotor blades absorb the _______________, all three forms of flow energy decrease, leading to a reduction in velocity, pressure, and temperature

Answer 12

flow energy

Question 13

composition of flow energy

Answer 13

1. kinetic energy (velocity)
2. pressure energy (pressure)
3. thermal energy (temperature)

Question 14

if reversible and adiabatic, the process is?

Answer 14

isentropic

Question 15

it is less effective in generating lift force

Answer 15

low-velocity fluid

Question 16

When high-energy fluid passes through the airfoil-shaped rotor blades, a _____________________ is created which will produce __________ that will rotate the turbine

Answer 16

pressure difference, lift force

Question 17

isentropic efficiency (n) of the turbine is defined as the ratio of?

Answer 17

actual work output and ideal (isentropic) work output

Question 18

This is like a turbine operating in reverse

Answer 18

compressors

Question 19

Since ___________________ is less effective in generating lift force, the fluid is passed through stator blades (nozzles), to increase the velocity again

Answer 19

low-velocity fluid

Question 20

one way of conserving the total energy

Answer 20

increasing the velocity

Question 21

assumptions in OEB in turbines

Answer 21

1. no change in elevation
2. adiabatic (no heat transfer)
3. inlet and exit are designed to make fluid velocities roughly equal

Question 22

A device that converts
flow energy to produce mechanical work

Answer 22

turbine

Question 23

To conserve the total energy, the stator section reduces?

Answer 23

pressure and temperature

Question 24

in this case, the fluid that passes in the turbine expands reversibly and adiabatically, hence, the process is isentropic

Answer 24

ideal case

Question 25

are fixed and guide the flow to properly direct it onto the next rotor stage

Answer 25

stator blades

Question 26

As the rotor blades absorb the flow energy, all three forms of flow energy decrease, leading to a reduction in _____________, _____________, and _________________

Answer 26

velocity, pressure, temperature

Question 27

it causes the rotor blades to rotate

Answer 27

mechanical energy