Jetman
Junior Member
Joined: August 2022
Posts: 81
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Post by Jetman on May 7, 2023 10:43:38 GMT -5
Hello Jetman here, I am wondering what the best liquid fuel delivery system is!! I.e. what is a good spray nozzle for diesel, pump, regulator etc… Thanks!
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Post by racket on May 7, 2023 17:29:09 GMT -5
Theres lotsa options , depends on how much complexity you want and its end use .
Simple one , 044 auto EFI pump with a tee on the outlet with a dump valve returning some flow to tank , using an oil burner spray nozzle in the combustor .
A bit more complicated , same AFI pump but using PWM controller to regulate flow .
Even more complicated , a small hydraulic pump driven by an electric motor providing >500 psi fuel pressure , with a complicated throttling arrangement
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Jetman
Junior Member
Joined: August 2022
Posts: 81
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Post by Jetman on May 7, 2023 18:27:03 GMT -5
Hello, I am looking at the delevan 6.-90A oil injectors… how many would I need for my 3.5 in turbo and how would I configure them in the combustion chamber?? Thanks!
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Jetman
Junior Member
Joined: August 2022
Posts: 81
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Post by Jetman on May 7, 2023 18:56:55 GMT -5
Also how much psi should the pump have??
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Post by racket on May 7, 2023 19:34:32 GMT -5
What are the specs on those nozzles ?? Ideally we only want a single spray nozzle centred in the end of the flametube . Your PSI requirement will depend on the nozzle used , but because of the internal air pressures the fuel pressure has to first overcome it before atomisation can commence . The higher the fuel pressure the finer the atomisation and the faster the combustion , checkout what I used on my bike jetandturbineowners.proboards.com/thread/1366/tv84-turbine-bike?page=2 |
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Post by phoenixsilver on May 17, 2023 7:07:13 GMT -5
I'm curious why an oil burner spray nozzle is preferred over a regular fuel injector from a car engine, for instance?
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miuge
Veteran Member
Joined: March 2014
Posts: 200 
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Post by miuge on May 17, 2023 14:41:39 GMT -5
Combustor cap where the injector is located usually runs very hot, without a layer of cooling air around the injector as in simplest form of combustor it can glow orange, a regular fuel injector would melt. If you can choose, get a stainless oil burner nozzle as even brass nozzles can melt in a bad setup. Secondly car fuel injectors have a very narrow spray angle, 80 or 90 degree spray cone as on oil burner nozzles is a lot more ideal for these combustors.
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Post by phoenixsilver on May 19, 2023 3:44:19 GMT -5
Quite hard to get your hands on a 8-90 degree spray cone, hollow pattern, 10GPH+ oil burner nozzle in the UK. Any suggestions? Was thinking of getting a 10-12GPH nozzle myself then increasing the pressure in order to achieve the higher burn rate of ~15GPH that I'd be looking at later on.
(Sorry for hijacking the thread)
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Jetman
Junior Member
Joined: August 2022
Posts: 81
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Post by Jetman on May 26, 2023 17:10:06 GMT -5
No problem!
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ausjet
Veteran Member
Joined: May 2013
Posts: 135
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Post by ausjet on May 31, 2023 10:21:40 GMT -5
Quite hard to get your hands on a 8-90 degree spray cone, hollow pattern, 10GPH+ oil burner nozzle in the UK. Any suggestions? Was thinking of getting a 10-12GPH nozzle myself then increasing the pressure in order to achieve the higher burn rate of ~15GPH that I'd be looking at later on. (Sorry for hijacking the thread) Try eBay. I have bought a number of 10+gph 80 degree oil burner nozzles off “patriot-supply” |
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Post by phoenixsilver on Jun 2, 2023 6:16:44 GMT -5
Quite hard to get your hands on a 8-90 degree spray cone, hollow pattern, 10GPH+ oil burner nozzle in the UK. Any suggestions? Was thinking of getting a 10-12GPH nozzle myself then increasing the pressure in order to achieve the higher burn rate of ~15GPH that I'd be looking at later on. (Sorry for hijacking the thread) Try eBay. I have bought a number of 10+gph 80 degree oil burner nozzles off “patriot-supply” I have indeed seen this seller and I am considering taking advantage of somebody I know who is travelling to the US in a few weeks, to grab one for me so I don't have to pay for shipping. However, apparently semi solid pattern is fine, hence I'm also considering just getting this nozzle: www.ibhs.co.uk/monarch-oil-nozzle-13-50usg-x-80-plp.html |
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Jetman
Junior Member
Joined: August 2022
Posts: 81
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Post by Jetman on Jun 16, 2023 21:56:49 GMT -5
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Post by racket on Jun 16, 2023 23:42:40 GMT -5
That should do the job
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Jetman
Junior Member
Joined: August 2022
Posts: 81
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Post by Jetman on Aug 7, 2023 9:14:50 GMT -5
Hello, was just wondering if there is an equation to find the fuel nozzle gph needed in the combustion chamber?? Thanks!
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Post by racket on Aug 7, 2023 17:01:53 GMT -5
As a rough guide the engine runs an overall 60:1 A/F ratio , so the air mass flow /min is our fuel /hour.
Our inducers flow ~12 lbs/min/sq inch of area , so for say a 3 inch inducer of ~7 sq ins area , that works out at 84 lbs/min , so our fuel nozzle will need to flow 84 lbs/hr , divide by 6.7 lbs/US gallon for kero and we end up with 12.5 US GPH , but that would assume you have the "rated" 100 psi drop across the nozzle , if we were running 30 psi from the comp then you'd need 130psi fuel pressure .
Hope this helps
Cheers
John
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