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In most steam engine designs there is a short time at the end of the return stroke of the piston when all the valves are shut and it is compressing any remaining steam. Water can be introduced from the boiler or in a cold engine, steam will condense to water on the cool walls of the cylinders and can potentially hydrolock an engine.
Sea foam washed up or blown onto a beach. Sea foam, ocean foam, beach foam, or spume is a type of foam created by the agitation of seawater, particularly when it contains higher concentrations of dissolved organic matter (including proteins, lignins, and lipids) derived from sources such as the offshore breakdown of algal blooms. [1]
Pogo oscillation is a self-excited vibration in liquid-propellant rocket engines caused by combustion instability. [1] The unstable combustion results in variations of engine thrust, causing variations of acceleration on the vehicle's flexible structure, which in turn cause variations in propellant pressure and flow rate, closing the self-excitation cycle.
Additionally, the MHD design eliminates many of the wear and friction pieces of the drivetrain with a directly driven propeller by an engine. Problems with current technologies include expense and slow speed compared to a propeller driven by an engine. [8] [9] The extra expense is from the large generator that must be driven by an engine. Such ...
Other forms of prevention include the chemical treatment of water before it enters the boiler. In the event of priming (and also when steam is admitted through cold piping or into a cold cylinder) the operators need to open the cylinder cocks , which are designed to release trapped water.
This category lists multi-engine passenger airline accidents involving loss of all engines in flight and subsequent gliding flight. Causes of these rare situations have included fuel exhaustion or starvation, multiple bird strikes, volcanic ash, extreme weather and hijacking.