Wankel engine | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-07-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Wankel_engine


00:02:18 1 Concept
00:02:54 2 Design
00:09:42 3 History
00:09:51 3.1 Early developments
00:11:23 3.2 Licenses issued
00:14:03 3.3 Developments for motorcycles
00:14:52 3.4 Developments for cars
00:24:37 4 Engineering
00:32:07 4.1 Materials
00:35:45 4.2 Sealing
00:37:43 4.3 Fuel economy and emissions
00:46:12 4.4 Laser ignition
00:47:49 4.5 Homogeneous charge compression ignition (HCCI)
00:49:33 4.6 Spark Controlled Compression Ignition (SPCCI)
00:51:54 4.7 Compression-ignition rotary
00:55:25 4.8 Hydrogen fuel
00:58:05 5 Advantages
01:05:34 6 Disadvantages
01:19:49 7 Applications
01:19:59 7.1 Automobile racing
01:23:02 7.2 Motorcycle engines
01:28:52 7.3 Aircraft engines
01:39:51 7.4 Vehicle range extender
01:44:48 7.5 Other uses
01:50:22 7.6 Non-internal combustion
01:51:33 8 See also



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SUMMARY
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The Wankel engine is a type of internal combustion engine using an eccentric rotary design to convert pressure into rotating motion.
All parts rotate 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 reciprocating piston designs, the Wankel engine delivers advantages of simplicity, smoothness, compactness, high revolutions per minute, and a high power-to-weight ratio. 
The core of the Wankel engine is the rotor, which creates the turning motion. It is similar in shape to a Reuleaux triangle with the sides somewhat flatter. Wankel engines deliver three power pulses per revolution of the rotor using the Otto cycle. However the output shaft, because of its toothed gearing to the rotor, turns three times faster giving one power pulse per revolution at its output. The result is that the rotor turns much slower than the output shaft at one third of its speed. This can be seen in the animation below. The rotor in one revolution will be giving power pulses and exhausting at the same time, as the four stages of the Otto cycle occur in separate chambers of the engine. For comparison, in a two-stroke piston engine there is one power pulse per crankshaft revolution, the same as a Wankel engine, with one in two revolutions in a four-stroke piston engine. 
The four-stage Otto cycle of intake, compression, ignition, and exhaust occur each revolution of the rotor at each of the three rotor faces moving inside the oval-like epitrochoid-shaped housing, enabling the three power pulses per rotor revolution. 
Displacement measurement only measures one face of the rotor, since only one face is working for each output shaft revolution.
The engine is commonly referred to as a rotary engine, although this name is also applied to other completely different designs, including both pistoned and pistonless rotary engines.