ANALYSIS OF SIX STROKE ENGINE

6 STROKE ENGINE working and analysis: 

6 STROKE ENGINE working and analysis Prepared by VINAYAK MUDHOL 1 st semester M.tech(EAD) Under the Guidance of Prof. A.V.KULKARNI

OBJECTIVES: 

OBJECTIVES What is six stroke engine. How is it advantageous compared to four stroke engine

CONTENTS:: 

Introduction to IC Engine Classification of IC Engine as per strokes. Definition of 6 Stroke engine. Types of approach. Currently notable 6 Stroke Engine. Comparison between 6 Stroke & 4 Stroke Engine. Thermodynamic Advantages of 6 Stroke Engine with graphical representation CONTENTS:

IC Engine: 

IC Engine The internal combustion engine is an engine in which the combustion, or rapid oxidation, of gas and air occurs in a confined space called a combustion chamber to perform useful work.

Two Stroke Engine:: 

Two Stroke Engine:

Four-stroke engine : 

Four-stroke engine

6 STROKE ENGINE: 

6 STROKE ENGINE

Six-stroke IC Engine: : 

Six-stroke IC Engine: Basically there are two approaches which are described as follows,

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Approaches for six stroke engine design First approach There is two additional strokes by the main piston as fifth and sixth stroke Second approach It uses a second opposed piston which moves at half the cyclical rate of the main piston

1) Bajulaz six stroke engine : 

1 ) Bajulaz six stroke engine Bajulaz Six Stroke Engine was invented in 1989 by the Bajulaz S A ,company of Geneva, Switzerland and has U.S. Patent 4,809,511 and U.S. Patent 4,513,568 . The Bajulaz six stroke engine features are: 1.Reduction in fuel consumption by at least 40% 2.Two expansions (work) in six strokes 3.Dramatic reduction in pollution 4.Costs comparable to those of a four-stroke engine

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2) Six-stroke engine by (Trivandrum student’s) In the six-stroke engine developed by the students of College of Engineering, Trivandrum, India, the first four strokes are the same as a four stroke internal combustion engine. After the exhaust stroke, instead of air/fuel mixture (as in case of petrol engines), fresh air is sucked into the cylinder from the air filter, and is removed during the sixth stroke. Its features are:- 1.Reduction in fuel consumption 2.Dramatic reduction in pollution 3.Better scavenging and more extraction of work per cycle 4.Lower working temperature makes it easy to maintain optimum engine temperature level for better performance 5.The six-stroke engine does not require any basic modification to the existing engines. All technological experience and production methods remain unaltered

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3) Beare Head 6-Stroke Engine The term "Six Stroke" was coined by the inventor of the Beare Head, Malcolm Beare. The technology combines a four stroke engine bottom end with a ported cylinder closely resembling that of a two stroke, thus 4+2= Six Stroke.

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4 ) "Crower's six stroke engine The Crower six-stroke engine or Crower Cycle is a concept under development by Bruce Crower. Two extra strokes are added to the customary internal combustion engine four stroke Otto cycle. A fifth down-stroke is a "steam stroke" and the sixth is to exhaust the expanded steam while venting heat from the engine. SPECIAL FEATURES OF CROWER’S 6STROKE ENGINE 1.No cooling system required 2.Improves a typical engine’s fuel consumption 3. Requires a supply of distilled water to act as the medium for the second power stroke PROBLEMS OR OBSTACLES OF Crower’s 6 STROKE ENGINE 1.A warm up period of at least several minutes would be required in all automotive applications. 2.Power is reduced during warm up period 3.A steam-free cool down period is required to clear water/steam from the engine. 4.The weight of an oil separator and a water condenser are likely additions. 5.Endurance testing will likely identify components that may need to have upgraded materials designated, such as possibly using stainless steel for the valves, cylinders, and rings.

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Working of Crowers’s 6 stroke engine

6-stroke bike by Crower: 

6-stroke bike by Crower

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Thermodynamic Advantages of the Six Stroke The intake begins at 0 degrees on the X-axis. If the engine were a normal 4 stroke the cylinder capacity would be 340cc. Of note - maximum volume at the end of the intake stroke occurs at 173 degrees instead of 180 degrees- hence the total volume at the end of the intake stroke is 415cc as opposed to 375cc for a conventional stroke. This means that the extra volume is best swept by gas velocities and not mechanical movement, and therefore mechanical input energy is less. Also, maximum volume is before bottom dead centre 173 deg. Consequently valve timing is of longer duration in relation to engine volume and hence volumetric efficiency is considerably improved. The change in volume during the compression stroke is slightly greater than a 4 stroke after the ports are closed. The expansion stroke is much greater than a 4 stroke; both from T.D.C. to B.D.C. and from T.D.C. till the exhaust port is open. It is possible to leave the opening of the exhaust port later than in a 4 stroke because maximum volume is not reached until after B.D.C.-548 deg. Instead of 540 deg. Hence the 6 stroke system is better from a thermodynamic point of view because more energy is extracted from the expansion process.

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Volume-angle diagram for 4-stroke engine

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Volume-angle diagram for 6 stroke engine

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Pressure-Volume Diagram for OTTO Cycle

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Pressure-Volume diagram for DUAL Cycle

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Torque Angle Diagram For 4 Stroke Engine:

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Torque angle diagram for 6-Stroke Engine

Comparison Chart: 

Comparison Chart

CONCLUSSION: 

My objectives were: What is six stroke engine : An engine in which piston reciprocates 6 times in one cycle giving two power strokes with same fuel supply. How is it advantageous : More workdone for same fuel supply, high volumetric efficiency etc CONCLUSSION

References : 

. Tsunaki Hayasaki, Yuichirou Okamoto, Kenji Amagai and Masataka Arai “A Six-stroke DI Diesel Engine under Dual Fuel Operation “SAE Paper No 1999-01-1500 2.S.Goto and K.Kontani, "A Dual Fuel Injector for Die­sel Engines", SAE paper, No. 851584, 1985 3.“Internal Combustion Engines “A book by Mathur & Sharma. 4. “Internal Combustion Engines” Tata McGraw-hill publications, Author V Ganesan References

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QUIRIES ?

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Report submitted by VINAYAK MUDHOL

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THANKYOU