The thermodynamic analysis showed that under similar boundary conditions, the 6-stroke and 4-stroke engine cycles could attain very similar brake efficiencies, though the detailed availability balance breakdown could differ substantially. For some 6-stroke strategies engine breathing and airflow management were found to be challenging, and beneficial for other strategies. The ratio of fuel burned in the first combustion event to the second event had a strong impact on performance, heat loss, and emissions. Compared to 4-stroke cycle operation, the 6-stroke cycle exhibited lower PM emissions at stoichiometric operation, while higher NOx/PM emissions were observed under some lean conditions. Output from the experiments and simulations were then used to perform Availability and Energy balances for a thermodynamic comparison of the two cycles. 1-D engine simulations with predictive combustion models were used to support, iterate on, and explore the 6-stroke operation in conjunction with the experiments.
Intr oduction: The term six stroke engine Describes two different Approaches in internal combustion engine Developed Since the early 1880s, to improve its efficency and Reduce Emission.we can increase the Breake thermal efficiency of the engine. The details of this three types of six stroke Engine are given below:- 1. Keywords: Six-Stroke engine, water injection system. Experiments were performed on a single-cylinder 15-liter (equivalent) research engine equipped with flexible valvetrain and fuel injection systems to allow direct comparison between 4-stroke and 6-stroke performance across multiple hardware configurations. There are three types of six stroke Engine. Fundamental questions regarding the abilities and trade-offs of a 6-stroke engine cycle were investigated for near-stoichiometric and lean operation. The pistons go up and down six times for each injection of fuel.ABSTRACT Driven by the desire to implement low-cost, high-efficiency NOx aftertreatment systems, such as Three Way Catalysts (TWC) or Lean NOx Traps (LNT), a novel 6-Stroke engine cycle was explored to determine the feasibility of implementing such a cycle on a compression ignition engine while continuing to deliver fuel efficiency.
As well as extracting power, the additional stroke cools the engine by water which is used for steam generation and removes the need for a cooling system which is used in four stroke Otto cycle and makes the engine lighter and giving 40% increased efficiency over the normal Otto cycle.
In this engine, steam is produce from water with the help of heat generated from four-stroke cycle, which is later used as a working fluid for the additional power stroke. The exhausted heat generated form four stroke cycle is used in this engine to get an additional power and exhaust stroke of the piston in the same cylinder. Ottos patent was overturned in 1886 in favor of the patent granted to Alphonse Beau de Roaches for his four-stroke engine. The engine which we get by adding two more stroke in existing four stroke engines generates more power with higher fuel efficiency. He continued to develop his four-stroke engine after 1876 and he considered his work finished after his invention of the first magneto ignition system for low voltage ignition in 1884.
The four-stroke combustion engine is extensively used due to better fuel economy and less exhaust smoke. The requirement for the advancement of internal combustion (IC) engines and enhance methods for the combustion cycle is increasing day by day. In Six Stroke engine, the name indicates a cycle of six strokes in which two are useful power strokes. Six-Stroke Cylinder Engine : An Emerging Technology. Now a day the most difficult challenges in engine technology is to increase its thermal efficiency, If the efficiency is higher, than there will less fuel consumption and lower atmospheric emissions per unit of work produced by the engine.
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