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Uniflow steam engine, a steam engine with a long uniflow cylinder that receives inlet steam at each end (for a double-acting engine) and exhausts through ports at the centre. Uniflow diesel engine, a two-stroke diesel engine with inlet through piston-ported fixed ports in the lower part of the cylinder, and exhaust through valves in the ...
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.
The engine is uniflow-scavenged by way of exhaust valves that are operated by electronically controlled hydraulics, thus eliminating the camshaft. As of 2006, [ needs update ] more than 300 RT-flex96C engines and older RTA96C engines were in service or on order.
The Cyclone Mark V Engine is a six cylinder radial uniflow engine of two inch bore and two inch stroke. Pistons are single acting. Pistons are single acting. The engine is claimed to produce 100 hp at 3,600 rpm using steam at 3,200 psi and 1,200 °F.
On the left is a Roots-type lobe blower, which provides positive pressure downstream (to the right) into an air chamber which surrounds the engine cylinder. As the piston travels down, it uncovers the side ports, drawing air into the cylinder; as the piston travels back up, the air is compressed and heated.
Schematic animation of a two-stroke uniflow diesel engine The engine is a uniflow design with four poppet -type exhaust valves in the cylinder head. For maintenance, a power assembly , consisting of a cylinder head, cylinder liner, piston, piston carrier, and piston rod, can be individually and relatively easily and quickly replaced.
In 1955 the UD name was born, when Minsei Diesel Industries introduced a range uniflow-scavenging 2-cycle diesel engine. Of course, the UD stood for "Uniflow Diesel", named after the engine they had invented for use in their trucks. The production of various trucks and buses with 81 kW (110 PS) UD3, 110 kW (150 PS) UD4 and 169 kW (230 PS) UD6 ...
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 ...