6 stroke diesel engine (20)

7/28/2019 6 Stroke Diesel Engine (20)

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Maharishi Markandeshwar UniversityDepartment of Mechanical Engineering

A Technical Seminar Presentation On

Presented By

Vikash GuliaRoll No: 11092350

8th Semester


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CONTENTS

Introduction

Concept of Six stroke engine

Dual fuel Six stroke engine

Specifications

Comparison

Features

Performance and economyConclusion


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INTRODUCTION

A six stroke engine derived its namefrom the fact that it is a mixture of two

and four stroke engine.

This engine is a radical hybridizationof two and four stroke engine that the

top portion of two stroke engine and

the bottom rather the middle section ofa four stroke engine.


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CONCEPT OF SIX STROKE

ENGINEThis technology is also known as

Beare Technology.

This engine got its name due to its

construction.This engine is a radical hybridization

of two and four stroke engines.

These types of engines have manyadvantages compared to OHC fourstroke engines.


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SIX STROKE ENGINE

1. Intake valve

2. Heating chamber valve

3. Combustion chamber valve

4. Exhaust valve5. Cylinder

6. Combustion chamber

7. Air heating chamber

8. Wall of combustion chamber

9. Fuel injector

10.Heater plug

STROKE 1Intake of pure air in thecylinder


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STROKE 2 STROKE 3

Compression of pure air in

heating chamber

Release of combustion

gases in the cylinder


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STROKE 4 STROKE 5

Release of pure air

into cylinder

Recompression of pure air

in the combustion chamber


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STROKE 6

Exhaust of combustion gases


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DUAL FUEL SIX STROKE

ENGINE

This engine runs by two fuels i.e. diesel (primary fuel) and

methanol (secondary fuel)


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SPECIFICATIONS

Table 1. Specifications of the test engine:

Four stoke Six stroke

Diesel Engine Diesel Engine

Engine type DI, Single cylinder, Air cooled, OHV

Bore x Stroke [mm] 82 x 78

Displacement [cc] 412

Top Clearance [mm] 0.9

Cavity Volume [cc] 16

Compression ratio 21

Intake Valve Open 100

BTDC 70

BTDC

Intake valve Close 1400

BTDC 1450

BTDC

Exhaust Valve Open 1350

ATDC 1400

ATDCExhaust Valve Close 12

0ATDC 3

0ATDC

Valve Overlap 220

100

Rated power 5.9 kW /3000rpm

Base Engine ----------------


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COMPARISONSComparison between four stroke & six stroke diesel engines

Engine Parameters

Four Stroke

Diesel Engine

Six Stroke

Diesel Engine

Engine Speed Ne [rpm] 2007 2016

Supplied combustion heat per cycle

Qt [KJ/cycle] 0.50 0.68

Brake torque Tb [N-m] 15.52 15.28

Brake power Lb [KW] 3.26 3.24

BSFC. b [ g / KW-h] 217.9 520.3

IMEP Pi [Kgf / cm2] 5.94 4.37

Indicated torque Ti [N-m] 19.10 18.71

Indicated power Li [KW] 4.01 3.75

ISFC bi [g / KW-h ] 177.2 163.3


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ADVANTAGES

Reduction in fuel consumption by at least 40%

Two expansions(work/Power stroke) in six strokes

Dramatic reduction in pollution ( up to 65%)

Higheroverall efficiency

Lowerengine temperature & noise level

Due to more air intake, the cooling system is improved

Better scavenging and more extraction of work per cycle

Less inertia due to lightness of moving parts


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DISADVANTAGES

Brake power & indicated powerper cycle per

cylinder is comparatively lesser

Engine size increases due to many number of

cylinders & additional components

Higher manufacturing cost of six stroke engine


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APPLICATIONS

Automobiles, heavy goods, construction-site and

farm vehicles.

Motor-pumps, generator sets, stationary engines,

etc....intended for agriculture and industry.

Motorboats


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CONCLUSION

Drastically reducing fuel consumption (by 40%) and

pollution (by 60-90%) without radically affecting

performances

For the dual fuel six-stroke engine, soot & nitrous oxide was

practically eliminated by a small amount of methanol in the

second combustion process.It enables lower engine temperature and therefore increases

in the overall efficiency.


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6 stroke diesel engine (20)

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