Fuel droplets in SI engine cylinder

AI Thread Summary
Large fuel droplets greater than 100 micrometers in size behave differently in an SI engine cylinder due to turbulence. They are unlikely to adhere to the cylinder walls but may be deposited on the piston during the compression stroke. When the piston encounters these droplets, they can break apart into smaller droplets during the exhaust up-stroke. The pressure during the compression stroke increases the likelihood of droplets sticking to the piston. Understanding these dynamics is crucial for optimizing fuel atomization and combustion efficiency in SI engines.
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What happens to large (greater than 100 micrometer) fuel droplets (however few) in the SI engine cylinder?

Do they move up along with the piston or do they get deposited on the piston itself?
 
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With all that turbulance in the cylinder I don't think the droplets would stick to the cylinder walls. Now if the piston runs into the droplet it will probably 'break it up' into smaller droplets (on exhaust up-stroke). On the compress stroke the droplet would probably stick to the piston due to pressure...
 

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