Ramjet design questions

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bhupendra741in
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hiii.....just look at the design nd suggest me changes...

Post by bhupendra741in » Tue Aug 14, 2007 6:40 pm

hiii......i am just a biggner as far as ramjet is concerned.......so please help me out......i've prepared a design just hav a look at that nd then help me out with som more changes in it...........one thing which i m thinking is........i am getting soo much pressure...that if i change my nozzle design from converging to converging-diverging nozzle ....then it may give upto 3 mach........so gimme yr commnets for that.....I have prepared a new design which i am mailing you. Dimensions and readings are as follows:-
Diffuser Entrance area :- 706mm2
Diff ent dia :- 30mm
Diff length :- 50 mm is ideal ....i have taken 59mm
Diffu exit dia :- 51mm
CC length :- 110 mm
Nozzle exit dia :- 42mm
Nozzle length :- 40mm
A1= 706mm2
P1=1.10325bar
T1= 303K
V1= 140 m/s
P2= 1.21 bar
T2= 311K
V2= 43.34m/s
P3= 49.11 bar
T3= 896K
mass flow rate of air = 0.116kg/sec
fuel supply = 7gm/sec
Fuel Used = Propane
CV= 45000KJ/kg
But as per this design I can even get speed upto 3mach if I will change nozzle design from Converging Nozzle to Converging-Diverging Nozzle. So shall I do that.
Attachments
ramjet3.JPG
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ramjet5.JPG
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bghblj

Mike Everman
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Ramjet design questions

Post by Mike Everman » Tue Aug 14, 2007 9:32 pm

bhupendra,
Please post once.
I have moved your post to a new thread.
Good luck getting help, and welcome to the forum!
Mike
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bhupendra741in
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Re: Ramjet design questions

Post by bhupendra741in » Wed Aug 15, 2007 8:35 am

Mike Everman wrote:bhupendra,
Please post once.
I have moved your post to a new thread.
Good luck getting help, and welcome to the forum!
hey i m not getting to where u've started new thread.....nd by wot name....can u send me link
bghblj

bhupendra741in
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Re: Ramjet design questions

Post by bhupendra741in » Wed Aug 15, 2007 8:37 am

bhupendra741in wrote:
Mike Everman wrote:bhupendra,
Please post once.
I have moved your post to a new thread.
Good luck getting help, and welcome to the forum!
hey i m not getting to where u've started new thread.....nd by wot name....can u send me link
.....ok i got it......which name u've used....nd thanks for help...
bghblj

bhupendra741in
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line diagram of my desing

Post by bhupendra741in » Wed Aug 15, 2007 8:46 am

line dig of my design....nd cone type fuel injector and holder......from pin point of cone i m planning to suppy fuel
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Zippiot
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Post by Zippiot » Tue Sep 11, 2007 6:08 pm

Dimensions look good, get it built and running!!

Fuel is a huge factor in flameholder design and CC length. Slow burning fuels like Kerosine and WVO need longer CC's while Propane does not. But at these speeds you can run about all the fuels in the same jet.

Good luck
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bhupendra741in
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Post by bhupendra741in » Tue Sep 18, 2007 12:55 pm

Zippiot wrote:Dimensions look good, get it built and running!!

Fuel is a huge factor in flameholder design and CC length. Slow burning fuels like Kerosine and WVO need longer CC's while Propane does not. But at these speeds you can run about all the fuels in the same jet.

Good luck
thanks dude.....i m using propane in it.....nd i've given it for manufacturing........will post its pics soon
bghblj

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