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A uniflow engine is a piston engine where gas flow through the cylinder proceeds in a single unidirectional flow, without reversals between strokes. This gives thermodynamic advantages as each group of ports can stabilise at an equilibrium temperature, rather than being alternately heated and cooled.
Uniflow engines potentially allow greater expansion in a single cylinder without the relatively cool exhaust steam flowing across the hot end of the working cylinder and steam ports of a conventional "counterflow" steam engine during the exhaust stroke. This condition allows higher thermal efficiency.
In a double-acting engine the exhaust ports were in the middle of the cylinder. Almost all uniflow engines were large stationary types, but the system was tried by, among others, the North Eastern Railway in England, as described by Tuplin (see sources). Briefly, the system worked well and obtained a small increase in economy by decreasing fuel ...
Animation of two-stroke uniflow scavenging engine. The 6-110 series engines utilize uniflow scavenging, where a blower mounted to the exterior of the engine provides intake air through cored passages in the engine block and ports in the cylinder walls at slightly greater than atmospheric pressure. The engine exhausts through push-rod operated ...
Animated diagram of Deltic engine Cylinder firing order of the 18 cylinder Napier Deltic diesel engine: The grid represents triangular cylinder arrangement (banks A, B, C) and rows 1 to 6 The Napier Deltic engine is a British opposed-piston valveless , supercharged uniflow scavenged , two-stroke diesel engine used in marine and locomotive ...
The engine used a single crankshaft at one end of the cylinders and a crosshead for the opposing piston. Another early opposed piston car engine was in the Scottish Arrol-Johnston car, which appears to have been first installed in their 10 hp buckboard c1900. The engine was described and illustrated in some detail in the account of their 12-15 ...