Diesel Injector and Water Tube Boiler Back-Pressure

[Silly Questions]

TL;DR Summary

Certain powerplant components seem to be under a lot of pressure.

Diesel injector:
How much pressure relative to the maximum combustion chamber pressure during the sharpest phase of detonation does an injector need to be able to overcome to inject its full charge? How much overlap is typical between injection and detonation?

Water-tube boiler:
Are the water reservoirs at the bottom of the tubes under the same pressure as the steam manifold at the top? When the reservoirs are replenished while a ship is underway are they left in communication with the manifold? Are they replenished continuously or in cycles?

 

[jrmichler]

I was able to find good answers to pressures in diesel injectors and power boilers in less than one minute by using my favorite search engine. What have you tried?

 

[Silly Questions]

Wikipedia.

 

[Baluncore]

Diesel injector:
How much pressure relative to the maximum combustion chamber pressure during the sharpest phase of detonation does an injector need to be able to overcome to inject its full charge? How much overlap is typical between injection and detonation?

This will depend on the type of injection pump, or which version of the common rail system is employed. I can assure you that the injection pressure is sufficient.

A diesel engine injects fuel in a continuous burst. There should be no detonation, combustion begins a moment after injection begins and continues until after injection stops. There is more than 50% overlap, but it will vary dependent on the volume of fuel being injected.

 

[Silly Questions]

"There is more than 50% overlap."

The diagrams and animations I've seen don't do this feat of engineering justice. Thanks for your answer.

 

[anorlunda]

Diesel injectors and Water Tube Boilers in one thread. That's a pretty big leap.

Your question about the boilers doesn't make sense for all types of boilers. The link shows a brief tutorial on water tube boilers. Please read that before asking follow up questions. The picture is a figure from the tutorial.

https://www.electrical4u.com/water-tube-boiler-operation-and-types-of-water-tube-boiler/

 

[Silly Questions]

They're related by "what do you do about pressure in places where it might cause problems," but that relationship I admit exists only in my imagination.

From the reading I glean that the answer is "yes" to both questions of whether the reservoir is under pressure and is recharged under pressure. Thanks for the link!