6 strokeengine-BY AJIT
- 1. 6-STROKE ENGINE PRESENTED BY:- AJIT KUMAR SAHOO REGD NO:-1421108002
- 3. Actual Prototype of SIX Stroke engine
- 4. COMPARISON OF 4-stroke and 6-stroke Engine 4-stroke One Power Stroke Up to 35% Efficiency More Emissions Minimal Power One Working Fluid 6-stroke Two Power Stroke Up to 45% Efficiency Comparatively Less Emission More Power Two Working Fluid
- 5. WORKING OF 6-STROKE ENGINE The working principles of six stroke engine is based on the concept of four stroke engine but with some modification, another two strokes are added. SUCTION STROKE The piston moves from top dead center to the Bottom dead center and creates vacuum pressure . So the Air and fuel mixture is sucked in to the Cylinder.
- 6. COMPRESSION STROKE The piston moves from Bottom dead center to top dead center and compresses the Mixture. The mixture is compressed To high temperature and pressure. POWER STROKE: At the end of compression stroke the fuel is ignited and burnt. The pressure inside the cylinder increases rapidly and it pusses the piston down and the power is transmitted from piston to wheel.
- 7. EXHAUST STROKE: The Burnt product is pushed through the exhaust valve by the upward movement of the piston. SECONDARY POWER STROKE: At the end of the exhaust stroke the cylinder temperature becomes around 900-10000 C. At this stage water is injected by an Injector in the form of fine droplets. The water turns in to vapour increasing volume around 1600 times when it comes in contact with the superheated cylinder.
- 8. The water turns into vapour increasing volume around 1600 times when it comes in contact with the superheated cylinder. SECONDARY EXHAUST STROKE: In this stroke the water vapour is exhausted by the upward motion of the piston.
- 9. Valve timing diagram of 6-stroke engine IVO: Inlet Valve open EVO: Exhaust Valve Open IVC: Inlet Valve Close EVC: Exhaust Valve Close WC : Water Injection
- 10. Cycle analysis and Comparison FUEL FLOW RATE: The amount of fuel flow to the engine per unit time is known as fuel flow rate. As the diagram shows the fuel flow rate of 6-stroke engine is 50% lesser than the conventional 4-stroke engine.
- 11. THERMAL EFFICIENCY The thermal efficiency of the engine is the power produced by the engine to the power available from fuel. The thermal efficiency of the four stroke engine lies between 20-30%, where as The thermal efficiency of six stroke engine lies between 40-50%.
- 12. BRAKE SPECIFIC FUEL CONSUMPTION It is the ratio of fuel consumption per second to the brake power. As from the diagram the brake specific fuel consumption of 6-stroke engine is much lower than the conventional six stroke engine.
- 13. Factors affecting the engine performance Water injecting pump Used fuel and lubrication Valve timing of the engine Temperature of the cylinder wall
- 14. MODIFICATIONS REQUIRED FUEL TANK: The fuel tank should divided into two parts, as one part will contain fuel and the other part will contain water. The water used should be neutral and distilled. ENGINE COMPONENTS MATERIAL The engine components like piston, cylinder , cam, crank, valves etc. are subjected to severe thermal stress. The thermal stress developed due to the injection of water into the very hot cylinder. The rapid temperature changes may cause micro crack and fractures in the engine components as the periodical compression and expansion takes place. So the engine components should be designed with high thermal resistive metal alloys to withstand the stress and prevent failure of engine. The materials that can be used are… Silicon Nitride(Si3N4) Silicon Carbide(SiC) Zirconia(ZrO2) Alumina-Tungsten alloy etc.
- 15. CAM-SHAFT DESIGN In four stroke original angular speed of camshaft is one half of the crankshaft. The crankshaft rotates once for every two revolution of the crank shaft. 4- stroke
- 16. The camshaft of 6-stroke engine contains three cams. Intake cam Exhaust cam Water injector cam 6-stroke
- 17. Water Injection: The water injection is done by the help of water injector which is operated by the cam. This thing can be done more effectively by the use of Water metering pump or by the progressive cavity pump. Water metering Pump: A positive displacement pump capable of driving a fixed quantity of water into the cylinder at regular intervals, independent of the back pressure applied
- 18. ADVANTAGES There is 40% reduction in fuel consumption. Extracts work from heat that is ordinarily lost through the cooling system of a conventional engine. Reduces exhaust emissions per a given power range. Steam stroke cools the engine internally hence the use of much higher compression ratios. The weight and power loss of conventional cooling system parts can be eliminated.
- 19. Limitations and Obstacles Injecting relatively cold water onto a hot metal piston can damage it over time from thermal expansion and contraction. Separate water tank would have significant weight and space penalties A steam-free cool down reduces the temperature inside the combustion chamber. Cold climate anti-freezing measures would be needed in the water reservoir.