Deftone45075
Well-known member
- Joined
- Aug 29, 2002
- Posts
- 274
Archer,
Reciprocating engines have a lot of internal parts that are connected and continuoussly moving. The only protection from the extreme friction that could occur is an extremely thin layer of oil. Cranksafts, pistons, rods, valves, pushrods, and bearings are constantly rubbing against each other. There are more moving parts.
When looking at the straight "gas generator" of a turbine engine, it does not have parts moving against each other. All the stages of compressor blades and turbine blades are permanently fitted to the compressor shaft, and all rotate together. In the case of an engine with two spools, yes they are spinning at different rates but this is only one area where parts are moving whithin each other, and it is rigged with bearings. No where near as much friction as a piston rubbing against a cylinder.
Reciprocating engines have a lot of internal parts that are connected and continuoussly moving. The only protection from the extreme friction that could occur is an extremely thin layer of oil. Cranksafts, pistons, rods, valves, pushrods, and bearings are constantly rubbing against each other. There are more moving parts.
When looking at the straight "gas generator" of a turbine engine, it does not have parts moving against each other. All the stages of compressor blades and turbine blades are permanently fitted to the compressor shaft, and all rotate together. In the case of an engine with two spools, yes they are spinning at different rates but this is only one area where parts are moving whithin each other, and it is rigged with bearings. No where near as much friction as a piston rubbing against a cylinder.