This document provides an introduction to turbo jet engines, including their working principle and performance parameters. It explains that turbo jets work by compressing air in a rotating compressor, mixing it with fuel and igniting it to produce hot combustion gases, which expand through a turbine to extract power and drive the compressor. The high-velocity exhaust gases exiting the turbine nozzle produce thrust based on Newton's third law of motion. Key engine performance metrics are described as thrust, efficiency, and specific fuel consumption. Advantages of turbo jets include high power-to-weight ratio and compact size, while disadvantages are higher cost and slower response compared to reciprocating engines.

1. Introduction to Turbo Jet Engines,
Working Principle
And
Performance
Prepared By,
Vedprakash Arya

2. Contents
❖Introduction
❖Performance Parameters
❖Working Principle
❖Merits & Demerits

3. Introduction

4. ▪ Turbojets are the oldest kind of general-purpose jet
engines. Turbojets are rotary engines that extracts
energy from a flow of combustion gas.
▪ They produce thrust by increasing the velocity of
the air flowing through the engine and operate on
Newton’s third law of motion " For every action there
is an equal and opposite reaction”.

5. Working Principle

6. ❖Air is drawn into the rotating compressor via the intake and
is compressed to a higher pressure before entering the
combustion chamber.
❖ Fuel is mixed with the compressed air and ignited by a
flame in the eddy of a flame holder.
❖Hot combustion products leaving the combustor expand
through the turbine where power is extracted to drive the
compressor.
❖The gas stream exiting the turbine expands to ambient
pressure via the propelling nozzle, producing a high velocity
jet in the exhaust plume.

10. (
(
Engine Performance Parameters
❖Thrust Equation
❖Efficiency
❖Specific Fuel Consumption

17. E
F
F
I
C
I
E
N
C
Y

19. ❖Very high power-to-weight ratio.
❖Compact than most reciprocating engines of the same power rating.
❖Fewer moving parts than reciprocating engines.
❖Low operating pressures.
❖High operation speeds.
❖Low lubricating oil cost and consumption.
Advantages of Turbojet Engines

20. ❖Cost
❖Longer startup than reciprocating engines.
❖Less responsive to changes in power demand
compared to
reciprocating engines.
Disadvantages of Turbojet Engines

21. Thank
You!