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Post by Johansson on Mar 21, 2016 9:33:40 GMT -5
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Post by madpatty on Mar 21, 2016 10:00:51 GMT -5
Hi Anders,
Thanks for sharing.
How to cut those needles to size? Are the normal wire cutters sufficient because they usually make the ends round and bent differently.
Atleast this was what was happening to copper capillaries.
And secondly what is the hear source for brazing?
Thanks.
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Post by Johansson on Mar 21, 2016 12:56:17 GMT -5
I use sharp pliers to cut them and then use a fine grit band sander to get the end back to its round shape. A small drill can be used by hand to remove any grit from the inside of the syringe ends. For brazing I use a hand held propane torch similar to a MAP torch, it has to be able to get the metal a bright red in order to melt the silver solder. Use the smallest torch flame you can since an overly wide flame will heat more than one syringe and possibly melt the already soldered ones. I havenĀ“t tried but I guess that a cheap butane torch lighter would work perfectly with a thin walled fuel manifold ring. www.amazon.com/FOGO%C2%AE-Butane-Lighter-Windproof-Flames/dp/B00S8Q3MJOCheers! /Anders
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Post by racket on Mar 22, 2016 3:08:55 GMT -5
Hi Patty
Making a "micro" type engine requires a lot more "sophistication" with the build quality compared to a DIY type engine based on a turbo , without the necessary componentry and build equipment its really not going to turn out well, you've done extremely well to get to where you have , but I feel you'll only be making a lot of frustration for yourself if you persist .
You need stainless steel syringe/capillary tubing , and you need the appropriate silver solder and flux to make the fuel manifold.
Trying to source very small spray nozzles will be almost impossible for you if you can't even purchase the capillary tubing and silver solder.
Cheers John
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Post by kanhaiya26 on Apr 26, 2016 5:04:53 GMT -5
Well i am using a k26 turbocharger to make a mini-jet.For NGV can u say what will be the angles that the NGV will be making with radial turbine.
Regards, Kanhaiya
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Post by madpatty on Apr 26, 2016 6:29:42 GMT -5
Hi.
If its a turbocharger based jet engine then you won't need a NGV.
Cheers, Patty
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Post by madpatty on May 4, 2016 13:41:21 GMT -5
Hi Guys, I have decided to change the old damaged NGVs and replace them with a new piece milled out of solid steel. For, that I have made a CAD drawing. I need your comments on the new NGV design and need to know if its OK or NOT. Thanks.
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Post by racket on May 4, 2016 17:15:04 GMT -5
Hi Patty
That NGV won't work
Cheers John
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Post by madpatty on May 4, 2016 18:18:23 GMT -5
Hi John,
Suggestions. What to change.
Length, thickness, leading edge diameter or what?
Thanks.
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Post by racket on May 4, 2016 19:04:00 GMT -5
Hi Patty
Too many vanes = too much surface area for friction , your small wheel only needs half that many .
The vanes have blunt outlet ends with a large angle taper , the taper needs to be over the full length with the outlet end <1mm thick .
The actual nozzles in the NGV look more like parallel passageways .
The throat area is a lot smaller than the area downstream of the vanes so theres a likelihood of recompression and a velocity reduction .
Do a Google search for variable vaned turbo images and copy one :-)
Cheers John
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Post by madpatty on May 6, 2016 20:48:22 GMT -5
Hi Racket,
In which case there can be a backflow in the evaporator?
That is fuel squirted by the needle is coming out of the evaporator but from the wrong side.
Cheers.
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Post by racket on May 6, 2016 23:56:22 GMT -5
Hi Patty
No
Cheers John
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Post by madpatty on May 23, 2016 0:06:47 GMT -5
Hi Racket,
What do you think. In case of a freepower turbine using a radial turbine wheel..
Can the scroll be replaced by using appropriately sized(throat area) NGVs to accelerate the flow. (Same as we do in gas producer)
Thanks.
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Post by racket on May 23, 2016 2:03:48 GMT -5
Yes , it can be done , I used a radial inflow freepower turbine in my 2 shaft kart jetandturbineowners.proboards.com/thread/40/2-shaft-turbine-kart-build ,it had a combination of scroll and "vanes" to feed the gases into the wheel . The problem with radial inflow wheels is flow capacity , and the available wheels can't produce their full potential horsepower without a lot of rpm which makes for transmission difficulties. Cheers John
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Post by madpatty on May 27, 2016 14:03:36 GMT -5
Hi Racket,
I am trying to implement air start system to speed up my spoolups.
I dont have scuba tanks.
But have supply of CO2 and O2 in pressurised cylinders.
O2 in a new cylinder is at approx 2200 psi whereas CO2 is around 1000 psi.
What do you think should be used.
Won't the use of oxygen for starting will make the environment oxyen rich inside the flametube and cause oxy-hydrocarbon flame torch like temperatures causing melting?
But i don't think 1000 psi of CO2 will be enough for spooling.
Thanks.
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