What is Atkinson cycle process?

The operation of the Atkinson cycle is depicted on a p-V diagram in Fig. 5.4. The cycle comprises the following processes: adiabatic compression 1 → 2, isochoric heat addition 2 → 3, adiabatic expansion 3 → 4, and isobaric heat removal. For this cycle, we have V2 = V3, p4 = p1, CR = V4/V3, PR = p3/p4, and TR = T3/T1.

What is the Atkinson combustion cycle?

The Atkinson-cycle engine is a type of internal combustion engine invented by James Atkinson in 1882. The Atkinson cycle is designed to provide efficiency at the expense of power density. A variation of this approach is used in some modern automobile engines.

Why is Atkinson more efficient than Otto?

The key advantage is higher efficiency than is achievable in an Otto engine, albeit with some loss of low-speed output. Compression and expansion ratios are the same in an Otto engine. Atkinson wins on efficiency because its expansion ratio is significantly larger than its compression ratio.

What is the different between Atkinson cycle and Otto cycle?

An Atkinson cycle has a greater work output and a higher thermal efficiency than the Otto cycle at the same operating condition. The compression ratios that maximize the work of the Otto cycle are always found to be higher than those for the Atkinson cycle at the same operating conditions.

Who invented Atkinson cycle?

James Atkinson
James Atkinson (1846–1914) of Hampstead was a British engineer who invented several engines with greater efficiency than the Otto cycle. The Atkinson cycle engines were named the “Differential 1882”, “Cycle 1887” and “Utilite 1892”. The most well-known of Atkinson’s engines is the “Cycle 1887”, patented in 1887.

What did James Atkinson invent?

Atkinson cycle engines
James Atkinson of Hampstead was a British engineer who invented several engines with greater efficiency than the Otto cycle. The Atkinson cycle engines were named the “Differential 1882”, “Cycle 1887” and “Utilite 1892”. The most well-known of Atkinson’s engines is the “Cycle 1887”, patented in 1887.

How does the Miller-cycle engine work?

A Miller-cycle engine leaves the intake valve open during part of the compression stroke, so that the engine is compressing against the pressure of the supercharger rather than the pressure of the cylinder walls. The effect is increased efficiency, at a level of about 15 percent.

Who makes Atkinson engines?

Toyota has announced the development of two hyper-fuel-efficient small-displacement petrol Atkinson cycle engines: a three-cylinder 1.0-liter and four-cylinder 1.3-liter which will be introduced across the range from next year in 14 different variations.

How does Atkinson cycle engine work?

The pistons are powered by gasoline, sprayed into the engine and detonated by the spark plug. The piston moves four times in each cycle: down to draw in gasoline vapour, up to compress it, down when the vapour ignites and explodes, and then up to push out the exhaust.

Who was the original inventor of the mousetrap?

James Henry Atkinson
Original Mouse Traps In 1897, British inventor James Henry Atkinson debuted a prototype mouse trap called the “Little Nipper.” This classic snapping mouse trap springs shut in only 0.0038 seconds! The design prevails today and is still manufactured by a company called Procter.

How does a mousetrap work?

Snap traps are placed along pathways rodents travel, and an attractant such as food or nesting material can be used. When the spring mechanism is triggered, a metal bar snaps and kills the rodent. Rodents trapped expire from hypothermia since they can’t move and maintain their body temperature.

How many processes are in an Atkinson cycle?

In an Atkinson cycle (modified Otto cycle), the system executing the cycle undergoes a series of four processes: two isentropic (reversible adiabatic) processes alternated with one isochoric process and one isobaric process:

Can the Atkinson cycle improve gas turbine performance?

INTRODUCTION Gas turbine engine performance can be significantly improved by implementing an unfamiliar thermodynamic cycle known as the Atkinson (aka Humphrey) cycle [1]. The Atkinson cycle is similar to the Brayton cycle but uses constant-volume combustion rather than constant-pressure combustion process.

Does the Atkinson cycle reduce entropy generation?

Thermodynamic analysis of the Atkinson cycle shows that the implementation of this cycle significantly reduces entropy generation while producing more net work output, allowing for engine efficiency enhancement [2]. Figure 1: p-vDiagram of the Atkinson cycle. Figure 2: T-sDiagram of Atkinson Cycle.

What is the difference between the Otto cycle and Atkinson cycle?

The Atkinson cycle is similar to the Brayton cycle but uses constant-volume combustion rather than constant-pressure combustion process. Compared to the Otto cycle, the Atkinson cycle benefits from full expansion of burned gas, which does not occur in the Otto cycle.