Jet Engine Operation As An Integrated System INME5702 Class 5

1
Jet Engine OperationAs An Integrated
SystemINME5702Class 5
2
Agenda for Class 5

• Review Homework 1
• Corrected Flow
• Compressor and Turbine Work
• Compressor and Turbine Efficiencies
• Work With the 7 High Spool Governing Equations
• Work Homework 2

3
Single-Spool Turbojet Equations
A8
A4
8
2
5
4
3
COMPRESSOR
NOZZLE

SHAFT
TURBINE

Wa
BURNER

CHOKED FLOW
Wf
4
Corrected Flow

• Compressor Corrected Flow is defined as
• For the single-spool turbojet the compressor
  inlet is station 2, so

Subscript i denotes inlet
5
Corrected Flow

• As we add compressors the inlet station will
  change, but TStd and PStd always remain the same
  and are used the same way
• For the second compressor of the two-spool
  turbojet the inlet is station 2.5, so

Subscript i denotes inlet
6

• Review
• Compressor Efficiency
• Compressor Work
• Turbine Efficiency

7

• Review Homework 1
• Excel File

8
Engine Data Demonstrates the Importance of
Correcting Raw Data
9
Engine Data Demonstrates the Importance of
Correcting Raw Data
Compressor Exit Temperature, To vs. Raw Flow, W
Compressor Corrected Exit Temperature vs.
Corrected Flow
10
Engine Data Demonstrates the Importance of
Correcting Raw Data
Compressor Exit Pressure, Po vs. Raw Flow, W
CompressorPressure Ratio, Po/Pi vs. Corrected
Flow, Wc
11

• Review Homework 2
• Excel File