PROF. ALVARADO 1

Experiment 7:Gas Turbine

(Brayton Cycle Experiment)

ENTC-370

Brayton Cycle

ENTC-370 PROF. ALVARADO 2

A thermodynamic cycle that describes the workings of the gas turbine engine 1-2 Isentropic compression 2-3 Isobaric heat addition3-4 Isentropic expansion 4-1 Isobaric heat rejection

Gas Turbine Engine

ENTC-370 PROF. ALVARADO 3

PROF. ALVARADO 4

Parts Name

ENTC-370

PROF. ALVARADO 5

Engine Sensor Locations

ENTC-370

PROF. ALVARADO 6

Software Control Panel

ENTC-370

a) By pressing ”Log data to file”, you’ll be able to save data to excel file. But in the excel file, Pressure and Temperature at 3 and 4 are inversed.

b) Pressure shown here are gage pressure

PROF. ALVARADO 7

Data Analysis

1. Plot the following diagrams:• Compressor Inlet(P1)/Outlet Pressure (P2) vs. Time• Compressor Inlet(T1)/Outlet Temperature(T2) vs. Time• Turbine Inlet(P4)/Outlet Pressure(P3) vs. Time• Turbine Inlet(T4)/Outlet Temperature(T3) vs. Time• RPM vs. Time

ENTC-370

PROF. ALVARADO 8

Data Analysis

2. Find T1-T4 and P1-P4 under peak RPM.

3. For the analysis point chosen in #2, find the Specific Enthalpy at each Cycle Point(Using air tables): h1, h2, h4, h3.

ENTC-370

PROF. ALVARADO 9

Data Analysis

4.Determine specific work and specific heat transfer:

ENTC-370

PROF. ALVARADO 10

Data Analysis5.Determine the efficiency

ENTC-370

_

(1-k)k

2

1

_ :

(%) 100

_ _ :

η=1-r (k 1.4, air)

r

cycle netT

in

p

Hp

L

Thermo efficiencywq

Brayton Cycle Efficiency

P PP P

PROF. ALVARADO 11

Data Analysis6. Determine the power of the system

ENTC-370

_3 _ 3abs ATM gageP P P

_ 3

3

absPRT

_32 gagePV

m AV

_cycle netW m w

20.00311A m

Gas Turbine Engine Video

ENTC-370 PROF. ALVARADO 12

• http://www.youtube.com/v/kw6nIo5LKqE?autoplay=1&rel=0