Alacrity 发表于 2025-3-21 16:13:41
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Combustion and fuels,ether the process is idealised as an Otto cycle or a Diesel cycle. The combustion process occurs at neither constant volume (Otto cycle), nor constant pressure (Diesel cycle). The difference between the two combustion processes is that spark ignition engines usually have pre-mixed flames while comprAffection 发表于 2025-3-22 05:32:10
Spark ignition engines,chiometric (chemically correct) for satisfactory spark ignition and flame propagation. The equivalence ratio or mixture strength of the air/fuel mixture also affects pollutant emissions, as discussed in chapter 3, and influences the susceptibility to spontaneous self-ignition (which can lead to knocinfantile 发表于 2025-3-22 11:58:00
Compression ignition engines,uld have a high output (bmep), high efficiency, rapid combustion, a clean exhaust and be silent. To some extent these are conflicting requirements; for instance, engine output is directly limited by smoke levels. There are two main classes of combustion chamber: those with direct injection (DI) intopus840 发表于 2025-3-22 15:23:12
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In-cylinder motion and turbulent combustion,, but always present is turbulence. The bulk air motion which approximates to a forced vortex about the cylinder axis is known as axial swirl, and it is normally associated with direct injection diesel engines. When the air motion rotates about an axis normal to the cylinder axis (this is usually pa软膏 发表于 2025-3-23 05:24:08
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