PDF | One of the most difficult challenges in engine technology today is the urgent need to increase engine thermal efficiency. Higher efficiencies mean less fuel. PDF | In today's world, the usage of internal combustion engines is We have also considered cylinder's position in six stroke engine. As the. Internal Combustion Engine while maintaining its prime focus on six stroke soon be revolutionized by a new six- stroke design which adds a second power.
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In six stroke engine. The pistons go up and down six times for each injection of fuel. These six stroke engines have two power strokes: one by fuel, one by steam. CONTENTS. Introduction. How six stroke engine works. Working principles. Specification of six stroke engine. Comparison of six stroke engine with four stroke. Get More Information about Six Stroke Engine PDF Download by visiting this link. Six Stroke engine, the name itself indicates a cycle of six.
Dyer's six-stroke engine features: No cooling system required Improves a typical engine's fuel consumption Requires a supply of pure water to act as the medium for the second power stroke. Extracts the additional power from the expansion of steam.
Bajulaz six-stroke engine[ edit ] The Bajulaz six-stroke engine is similar to a regular combustion engine in design. There are, however, modifications to the cylinder head, with two supplementary fixed-capacity chambers: a combustion chamber and an air-preheating chamber above each cylinder.
The combustion chamber receives a charge of heated air from the cylinder; the injection of fuel begins an isochoric constant-volume burn, which increases the thermal efficiency compared to a burn in the cylinder.
The high pressure achieved is then released into the cylinder to work the power or expansion stroke. Meanwhile, a second chamber, which blankets the combustion chamber, has its air content heated to a high degree by heat passing through the cylinder wall. This heated and pressurized air is then used to power an additional stroke of the piston. Patent 4,, and U. Patent 4,, The valve overlaps have been removed, and the two additional strokes using air injection provide for better gas scavenging.
U Krishnaraj, Mr. Boby Sebastian, Mr. Arun Nair and Mr. Thus, waste heat that requires an air or water cooling system to discharge in most engines is captured and put to use driving the piston.
The weight associated with a cooling system could be eliminated, but that would be balanced by a need for a water tank in addition to the normal fuel tank. The Crower six-stroke engine was an experimental design that attracted media attention in because of an interview given by the year-old American inventor , who has applied for a patent on his design.
Beare head[ edit ] This design was developed by Malcolm Beare of Australia. The technology combines a four-stroke engine bottom end with an opposed piston in the cylinder head working at half the cyclical rate of the bottom piston. Functionally, the second piston replaces the valve mechanism of a conventional engine. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed.
It was granted patent nr by the Polish Patent Office. The double-piston combustion engine's work is based on the cooperation of both modules.
The air load change takes place in the two-stroke section of the engine. The piston of the four-stroke section is an air load exchange aiding system, working as a system of valves.
The cylinder is filled with air or with an air-fuel mixture. The filling process takes place at overpressure by the slide inlet system. The exhaust gases are removed as in the classical two-stroke engine, by exhaust windows in the cylinder.
To avoid this, a piston is installed on both valve shafts which compensate this pressure. Being a six-stroke cycle, the camshaft speed in one third of the crankshaft speed. The combustion chambers walls are glowing when the engine is running. Their small thickness allows heat exchange with the air-heating chamber, which is surrounding the combustion chamber.
The air-heating chamber is isolated from the cylinder head to reduce thermal loss. The combustion and air-heating chambers have different compression ratio. The compression ratio is high for the heating chamber, which operates on an external cycle and is supplied solely with pure air.
On the other hand, the compression ratio is low for the combustion chamber because of effectively increased volumen, which operates on internal combustion cycle. The combustion of all injected fuel is insured, first, by the supply of preheated pure air in the combustion chamber, then, by the glowing walls of the chamber, which acts as multiple spark plugs.
In order to facilitate cold starts, the combustion chamber is fitted with a heater plug glow plug.
In contrast to a diesel engine, which requires a heavy construction, this multi-fuel engine, which can also use diesel fuel, may be built in a much lighter fashion than that of a gas engine, especially in the case of all moving parts.
As well as regulating the intake and exhaust strokes, the valves of the heating and the combustion chambers allow significantly additional adjustments for improving efficiency and reducing noise. The compression ratios can be increased because of the absent of hot spots and the rate of change in volume during the critical combustion period is less than in a Four stroke. The absence of valves within the combustion chamber allows considerable design freedom.
The specific power of the six-stroke engine will not be less than that of a four-stroke petrol engine, the increase in thermal efficiency compensating for the issue due to the two additional strokes. This lead to very smooth operation at low speed without any significant effects on consumption and the emission of pollutants, the combustion not being affected by the engine speed.