Wankel引擎 -Advantages , Disadvantages and Application

The Wankel engine is a type of internal combustion engine using an eccentric rotary design to convert pressure into rotating motion.

All parts rotate consistently in one direction, as opposed to the common reciprocating piston engine, which has pistons instantly and rapidly changing direction 180 degrees. In contrast to the more common reciprocating piston designs, the Wankel engine delivers advantages of simplicity, smoothness, compactness, high revolutions per minute, and a high power-to-weight ratio. This is primarily because there are three power pulses per rotor revolution. In a two-stroke piston engine there is one power pulse per crankshaft revolution, with one in two revolutions in a four-stroke piston engine. Although at the actual output shaft of a rotary engine, there is only one power pulse per revolution, since the output shaft spins three times as fast as the actual rotor, as can be seen in the animation below, it makes it roughly equivalent to a two-stroke piston engine of the same displacement. This is also why the displacement only measures one face of the rotor, since only one face is working for each output shaft revolution.

Advantages Of Wankel Engine :

Advantages of Wankel Engine :
1.华氏发动机比往复式活塞设计具有多个主要优势，此外还具有相似的位移和物理尺寸的较高输出。它很简单，运动部件较少。
2. The rotor is geared directly to the output shaft, there is no need for connecting rods, a conventional crankshaft, crankshaft balance weights, etc
3. Smoother flow of power but also the ability to produce more power by running at higher rpm.
4. Fuel of very low octane number can be used without preignition or knock.
5. It’s substantial safety benefit makes it useful in aircraft
6.没有阀门操作。
7.发动机在由铝制成的外壳内用铁转子构造，该铝的热膨胀更大。这样可以确保即使是严重过热的Wankel发动机也无法抓住。
8. It has smaller frontal area than a piston engine of equivalent power. The simplicity of design and smaller size of the Wankel engine also allows for savings in construction costs, compared to piston engines of comparable power output.

Disadvantages of Wankel Engine :
1 .The fuel-air mixture cannot be pre-stored as there is no intake valve.
2.将燃料注入Wankel发动机的时间明显短。
3. More complicated fuel injection technologies are required.
4. In terms of fuel economy,Wankel engines are generally less efficient than four stroke piston engines
5. Sealing loss is high.
6. The compression ratio is lower. This lowers the thermal efficiency and thus the fuel economy.
7.很难将发动机扩展到两个以上的转子。
8. There can be more carbon monoxide and unburned hydrocarbons in a Wankel’s exhaust stream.
9. Wankel发动机对失火非常敏感，因为发动机会因中风失去而失去动力，并在下一个室内射击中猛烈抨击。关心点火系统对于避免问题至关重要。

Applications of Wankel Engine:
1. Used in aircraft.
2.赛车。
3.用于迷你，微型和微米发动机设计。
4. Wankel设计的最异国情调的用途是在某些梅赛德斯 - 奔驰的安全带预张紧器系统中。
5. Go-karts, personal water craft and auxiliary power units for aircraft.