Search results
Results from the WOW.Com Content Network
Nuclear power stations using Parsons steam turbines include Bradwell, Calder Hall, Dungeness, Heysham 2 and Oldbury in England [8] and Chapelcross and Hunterston in Scotland. [9] Parsons took over the turbine and generator factories in Erith and Witton of the General Electric Company in the 1960s. [10]
Cutaway model of a MAN B&W two-stroke marine diesel engine with the piston rod attached to a crosshead. In the two-stroke cycle, the four stages of internal combustion engine operation (intake, compression, ignition, exhaust) occur in one 360° revolution of the crank shaft, whereas in a four-stroke engine they take two complete revolutions.
Galloway uniflow steam engine, now in Thinktank, Birmingham Science Museum. Steam entry is usually controlled by poppet valves (which act similarly to those used in internal combustion engines) that are operated by a camshaft. The inlet valves open to admit steam when minimum expansion volume has been reached at the start of the stroke.
Two-stroke engines often have a higher power-to-weight ratio than a four-stroke engine, since their power stroke occurs twice as often. Two-stroke engines can also have fewer moving parts, and thus be cheaper to manufacture and weigh less. In countries and regions with stringent emissions regulation, two-stroke engines have been phased out in ...
The shaft of the four-stroke piston rotates twice as fast as the shaft of the two-stroke piston, and the two-stroke part always runs at half speed. This ensures that both parts work optimally regarding fuel consumption at all times. The same principles apply to having two distinct engines, but the design of the M4+2 is much simpler.
In 2018, the Dresser-Rand Government Business unit of Siemens Government Technologies was sold to Curtiss-Wright Corporation for $212.5 million in cash. [19] At the time of acquisition, Dresser-Rand was an exclusive supplier of steam turbines and main engine guard valves across all aircraft carrier programs.
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
The combustion cycle can be either two-stroke (which results in a lighter engine for a given power output) [3] [4] or four-stroke (which produce lower levels of exhaust gas emissions). [5] [6] The fuel is usually either petrol or diesel. [7] In 1973, a small Wankel (rotary) engine manufactured by NSU was used in a lawn mower. [8]