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Macalester College (/ m ə ˈ k æ l ɪ s t ər / mə-KAL-iss-tər) is a private liberal arts college in Saint Paul, Minnesota, United States.Founded in 1874, Macalester is exclusively an undergraduate four-year institution with an enrollment of 2,142 students in the fall of 2023. [4]
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.
The uniflow type of steam engine uses steam that flows in one direction only in each half of the cylinder. Thermal efficiency is increased by having a temperature gradient along the cylinder. Steam always enters at the hot ends of the cylinder and exhausts through ports at the cooler centre.
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 consumption, but at the price structure prevailing at that time the extra ...
Diagram of uniflow scavenging. Scavenging is the process of replacing the exhaust gas in a cylinder of an internal combustion engine with the fresh air–fuel mixture (or fresh air, in the case of direct-injection engines) for the next cycle. If scavenging is incomplete, the remaining exhaust gases can cause improper combustion for the next ...
Australian engineer Ted Pritchard's [26] main field of research from the late 1950s until the 1970s was the building of several efficient steam power units working on the uniflow system adapted to a small truck and two cars. One of the cars was achieving the lowest emissions figures of that time.
Edward "Ted" Pritchard (28 August 1930 – 16 August 2007) was an Australian mechanical engineer, inventor and developer of small scale modern steam engines.Pritchard was obsessed by the virtues of modern steam as compared to the internal combustion engine.
Willans & Robinson engine, driving a dynamo generator. One of the best-known examples of the steeple engine was the Willans engine. [10] These were double- or triple-expansion compound engines, with the unusual features of single-acting cylinders and a central spindle valve shared between all cylinders.