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Pulse Detonation Engine

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ABSTRACT

Note: You can always click on the Readcast button to share with your Scribd followers. A pulse detonation engine, or "PDE", is a type of propulsion system that has the potential Auto-Readcasting: OffView Past Readcasts Undo to be both light and powerful and can operate from a standstill up to supersonic speeds. To date no practical PDE engine has been put into production, but several testbed engines Add a comment Submit

have been built, proving the basic concept to some extent at least. In theory the design

can produce an engine with an efficiency far surpassing more complex gas turbine Auto-Readcasting: OffView Past Readcasts Like

4

Brayton cycle engines, but with almost no moving parts.

Tw eet

All regular jet engines and most rocket engines operate on the deflagration of fuel, that is, the rapid but subsonic combustion of fuel. The pulse detonation engine is a concept currently in active development to create a jet engine that operates on the supersonic detonation of fuel.

The basic operation of the PDE is similar to that of the pulse jet engine; air is mixed with fuel to create a flammable mixture that is then ignited. The resulting combustion greatly Thisof Document increases the Search pressure the mixture to approximately 100 atmospheres, which then

Search expands through a nozzle for thrust. To ensure that the mixture exits to the rear, thereby Search History:

Searching...

pushing the aircraft forward, Result 00 of 00 a series of shutters are used with careful tuning of the inlet

00 results for result for

to force the air to travel in one direction only through the engine.

p. The main difference between a PDE and a traditional pulsejet is that the mixture does not undergo subsonic combustion but instead, supersonic detonation. In the PDE, the oxygen and fuel combination process is supersonic, effectively an explosion instead of burning. The other difference is that the shutters are replaced by more sophisticated valves.

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CONTENTS

1) INTRODUCTION…………………………...………………………………………4 1.1 CONCEPT………………………………………………………………..4 1.2 COMBUSTION…….…………………………………………………….5 1.3

DEFLAGRATION………………………………………………….……7 (i) FLAME PHYSICS………………………………………………….8

1.4

DETONATION ………………..……………………………………….10 (i) APPLICATIONS………………………………………………….12

2) BASIC PDE CYCLE……………………….………………....……………………12 3) DETONATION INITIATION IN PDE…………………………………………….14 3.1

DIRECT INITIATION………………………………………………….14

3.2

DEFLAGRATION TO DETONATION TRANSITION……….………15 (i) FACTORS INFLUENCING DDT………………………………..18 (ii) TIME VS POSITION GRAPH…………….……………………..20

4) BLOCK DIAGRAM OF PDE……………………………..………………………..20 5) WORKING OF PDE………………………………………………………………..21 5.1

T-S DIAGRAM………………………………………………………..25

6) PRACTICAL PROBLEMS INVOLVED IN PDE……….…………………………26 7) CURRENT STATE OF DEVELOPMENT…………………………………………27 8) THE FUTURE OF PDE…………………………………...………………………..27 9) REFERENCES……………………………………………..………………………28

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1.INTRODUCTION

1.1 CONCEPT

All regular jet engines and most rocket engines operate on the deflagration of fuel, that is, the rapid but subsonic combustion of fuel. The pulse detonation engine is a concept currently in active development to create a jet engine that operates on the supersonic detonation of fuel.

The basic operation of the PDE is similar to that of the pulse jet engine; air is mixed with fuel to create a flammable mixture that is then ignited. The resulting combustion greatly increases the pressure of the mixture to approximately 100 atmospheres, which then expands through a nozzle for thrust. To ensure that the mixture exits to the rear, thereby pushing the aircraft forward, a series of shutters are used with careful tuning of the inlet to force the air to travel in one direction only through the engine.

The main difference between a PDE and a traditional pulsejet is that the mixture does not undergo subsonic combustion but instead, supersonic detonation. In the PDE, the oxygen and fuel combination process is supersonic, effectively an explosion instead of burning. The other difference is that the shutters are replaced by more sophisticated valves. In some PDE designs from General Electric, the shutters are even removed because the process can be controlled by timing on the periodic sudden pressure drops that occur after each shock wave when the "combustion" products have been ejected in one shot.

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Pulse Detonation Engine A pulse detonation engine, or "PDE", is a type of propulsion system that has the potential to be both light and powerful and can operate from a standstill up to supersonic speeds. To date no practical… (More) A pulse detonation engine, or "PDE", is a type of propulsion system that has the potential to be both light and powerful and can operate from a standstill up to supersonic speeds. To date no practical PDE engine has been put into production, but several testbed engines have been built, proving the basic concept to some extent at least. In theory the design can produce an engine with an efficiency far surpassing more complex gas turbine Brayton cycle engines, but with almost no moving parts.All regular jet engines and most rocket engines operate on the deflagration of fuel, that is, the rapid but subsonic combustion of fuel. The pulse detonation engine is a concept currently in active development to create a jet engine that operates on the supersonic detonation of fuel.The basic operation of the PDE is similar to that of the pulse jet engine; air is mixed with fuel to create a flammable mixture that is then ignited. The resulting combustion greatly increases the pressure of the mixture to approximately 100 atmospheres, which then expands through a nozzle for thrust. To ensure that the mixture exits to the rear, thereby pushing the aircraft forward, a series of shutters are used with careful tuning of the inlet to force the air to travel in one direction only through the engine.The main difference between a PDE and a traditional pulsejet is that the mixture does not undergo subsonic combustion but instead, supersonic detonation. In the PDE, the oxygen and fuel combination process is supersonic, effectively an explosion instead of burning. The other difference is that the shutters are replaced by more sophisticated valves. (Less) Add To Collection 3.3K Reads 10 Readcasts 7 Embed Views

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