Jet Propulsion

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Code(Credit) : CUTM1100(3-1-0)

Course Syllabus

Module I: INTRODUCTION TO AIRCRAFT PROPULSION (4hrs)

Introduction to propulsion , Fundamental equations, Types of aircraft engines Performance parameters , thrust equation , factors affecting thrust and efficiencies.

Practice: Assembly of an aircraft piston engine and Study of an aircraft piston engine, various components, their functions and operating principles

Module II: DIFFUSER (5hrs)

Subsonic inlet and Internal flow, Major features of external flow, Relation between minimum area ratio and external deceleration ratio, Supersonic inlets, Starting problem on supersonic inlets, Shock swallowing by area variation, External deceleration, Modes of inlet operation.

Practice: Velocity and pressure variation in a diffuser using 3DS as well as using apparatus

Module III: AXIAL COMPRESSOR (5hrs)

Working principle of axial compressor, Elementary theory, Velocity triangles, Degree of reaction, Three dimensional flow, Compressor blade design & stage performance calculation, Factors affecting stage pressure ratio , off design performance, Axial compressor performance characteristics.

Practice: Assembly of an aircraft jet engine compressor

Module IV: CENTRIFUGAL COMPRESSOR (4hrs)

Working principle of centrifugal compressor, Work done and pressure rise, Inducer and impellor, Velocity diagrams, Compressor stage design, Concept of pre, whirl,  Rotation stall, Centrifugal compressor performance characteristics.

Module V: COMBUSTION CHAMBERS  (4hrs)

Classification of combustion chambers, Important factors affecting combustion chamber design, Combustion process, Combustion chamber performance, Effect of operating variables on performance, Flame tube cooling, Flame stabilization, Use of flame holders, Numerical problems.

Practice: Determination of heat of combustion of aviation fuel

Module VI: NOZZLES (5hrs)

Theory of flow in isentropic nozzles, Convergent nozzles and nozzle choking, Nozzle throat conditions, Nozzle efficiency, Losses in nozzles, Over expanded , under expanded nozzles , Ejector and variable area nozzles

Practice: Velocity and pressure variation in a high speed nozzel using 3DS

Characteristic plots of a free jet through a non circular and circular orifice using high speed jet

Module VII:

AFTERBURNER AND  THRUST AUGMENTATION (3hrs)

Working principle of afterburner, afterburner augmentation, Thrust and efficiency

3. Mathur,M.L and Sharma,R.P, "Gas Turbine Jet and Rocket Propulsion", Standard Publishers &Distributors,Delhi,2014

Source of reference; NPTl

Session 1

Introduction to propulsion , Fundamental equations

thrust_NASA

Session 2

Types of aircraft engines Performance parameter

Engine characteristics

Session 3

factors affecting thrust and efficiencies

Session 4

Practice: Assembly of an aircraft piston engine and Study of an aircraft piston engine, various components, their functions and operating principles

Session 5

Practice: Assembly of an aircraft piston engine and Study of an aircraft piston engine, various components, their functions and operating principles-- continue from above session

Session 7

Major features of external flow, Relation between minimum area ratio and external deceleration ratio

Session 9

Starting problem on supersonic inlets

Engine inlet

Session 10

Shock swallowing by area variation, External deceleration, Modes of inlet operation

Session 11

Practice: Velocity and pressure variation in a diffuser using 3DS as well as using apparatus

.

Session 12

Practice: Velocity and pressure variation in a diffuser using 3DS as well as using apparatus

Session 13

Working principle of axial compressor

Axial compressor

Session 14

Elementary theory, Velocity triangles

Session 15

Degree of reaction, Three dimensional flow

Session 16

Compressor blade design & stage performance calculation

Session 17

Factors affecting stage pressure ratio , off design performance,

Session 18

Axial compressor performance characteristics.

Session 19

Practice: Assembly of an aircraft jet engine compressor blade

Session 20

Practice: Assembly of an aircraft jet engine compressor

Session 21

Working principle of centrifugal compressor

centrifugal compressor

Session 22

Work done and pressure rise, Inducer and impellor, Velocity diagrams,

Inducer and impellor

Session 23

Compressor stage design, Concept of pre whirl,

centrifugal Compressor stage design

Session 24

Rotation stall, Centrifugal compressor performance characteristics.

Session 28

Important factors affecting combustion chamber design, Combustion process

combustion chamber design

Session 29

Combustion chamber performance, Effect of operating variables on performance,

Session 30

Flame tube cooling, Flame stabilization, Use of flame holders

Session 31

Theory of flow in isentropic nozzles

Nozzles

Session 32

Convergent nozzles and nozzle choking, Nozzle throat conditions

Convergent nozzles

Session 33

Over expanded , under expanded nozzles

underoverexpanded_two

Session 35

Practice: Velocity and pressure variation in a high speed nozzel using 3DS

Session 36

Practice:  Characteristic plots of a free jet through a non circular and circular orifice using high speed jet

Session 40

Practice: Velocity and pressure variation in a high speed nozzel using 3DS

Session 41

Practice: Characteristic plots of a free jet through a non circular and circular orifice using high speed jet