The stream from the bottom of the bottle becomes short when the bottle is filled from above

[Mihal]

the homogenous part of the stream becomes too short when the bottle is being filled from above. I need the longer stream when the bottle is being filled, such is shown on the photo where the bottle is not being filled.

this is needed for the kelving generator, in the design of which the lengths of the components are important. In this case, the length of the jet is the length from the nozzle to the inductor, and it must be specific and not changing during its falling. So I don't want it to shorten when I pour water into the bottle from the tap or hose!

 

[Lnewqban]

Welcome!
Place a big sponge inside the bottle.

 

[Baluncore]

The flow rate at which water exits the bottom of the bottle, is dependent on the water level in the bottle.

As water falls from the bottom of the bottle it accelerates due to gravity.

When filling directly from the tap, there is little height remaining between the bottom of the bottle and the sink, over which the water can accelerate downwards, but the bottle can be closer to full.

When being filled with a hose, the filling rate may be less, but the water will have more distance and time to accelerate downwards.

The further the water falls, the more it begins to break up, and bead into droplets, so it makes more noise when it impacts the sink. You do not see the volumetric flow rate, you hear the impact.