here is a 2d image of what i have so far. This is about as good as I can get it. another question would be if there is anything to be gained by trying to increase the boundary layer by machining grooves in the roof of the...
I can post a pic tomorrow but no it's not a sharp step it is a rectangle tube that changes to a round tube that has a curve in it plus a shaft that enters to drive the impeller of the pump. The water is pressure feed at 60 psi to the impeller. The curve and physical limitations make a tighter...
Yes that is what I was referring to. Although I can't compress the water I thought it could help by allowing the water a larger cross section in that area
Trying to move water through a curved and angled tube at 100+ mph and I have a pinch point part way down. Can I put a slite curve in the sides to help eliminate this? Much like how the fueselage is narrowed at the winng attachment point in an airplane to decrease drag.
I have a jet pump for a boat I am designing and am having issues with a pinch point before the impeller. I was thinking of putting a gentle curve in the side walls of the pump housing to addres this issue. Are ther problems with doing this with high speed water(100+...
Basically these are high powered jet boats. Roughly 1300 hp. the main drag on the boat ends up being the pump inlt and impeller section. The amount of the boat that is actually touching the water is around 6sqft. a drag reduction of 1-2% for the intake would be noticable. It is very difficult to...
Machining them was my plan but from the studies that I have read all mention that if the spacing and depthy is not correct you will actually increase the friction. It may be one of those things that really can't tested or claculated properly.
For us it is about cutting down the friction. We usually have 60-80 psi presssure in the intake of the pump. Just trying to cut down the amount of energy requiered to make that pressure.
It actually is a a jet pump intake so ya . 3M made a rblet tape for that purpose but is not available to the public and besides who knows what the depth and spacing needs to be. The 3M riblet tape had very small V grooves(.003") and was longitunal not perpendicular to the flow.
Nope I am talking about on the fuselage. apparantly there are very fine v grooves running perpendicular to the airflow that help with drag. Much like a shark has for less drag in water. http://www.rexresearch.com/lang/lang.htm
How about this instead. Fighter aircraft or high speed aircraft hav very small slits positioned very close together apparantly. What i want to do it the same thing for water that is running through a tube. A intake of a jet pump that is force fed with 120 mph water.
How would one calculate what size and how far apart to machine some small votex generators(basically slits) in a 8" dia tueb with water moving through it at 120 mph. The thinking here is that there is some drag that can be decreadsed by creating a boundry layer on the edges. Would this not make...
Well right now i am making them on a cnc mill.
I guess another way of looking at it would be.
Having a divergent cone 14" long with the large end 7" and the small end being 3.100" would the cone be more effecient at moving water through it at 200 psi inlet pressure with a smooth inner surface...
