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Post by madpatty on Jun 29, 2014 22:16:33 GMT -5
Thanks Racket....
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Post by madpatty on Jun 29, 2014 21:37:21 GMT -5
Hi Racket, Needed one suggestion...
In the case of my turbo in its original form at the compressor end, the oil slinger along with the split ring oil seal(compressor end) rotates with the seal's OD in contact with the oil seal plate's internal surface. The oil seal plate is made of some type of steel...
What my question is:- I want to make that oil seal plate as an integral part of aluminium diffuser(therefore the surface upon which that oil seal ring will make contact will be of aluminium) due to oil channeling issues.
WON'T that seal ring scratch that aluminium surface due to aluminium being softer than steel at high rpm's. And thus ruin the setup?? IS IT OK if seal ring's OD makes contact and thus rotates in the aluminium surface?
Thanks, Patty
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Post by madpatty on Jun 28, 2014 21:47:31 GMT -5
Hi Racket,
The diffuser that i cast from aluminium is itself doubtful if i will be able to screw my compressor cover to it... It is a bit porous due to bad casting...
What about the efficiency levels of constant thickness diffuser blades (without forward curving) as compared to wedge type?? Is there any appreciable loss or gain(keeping throat area same)
Thanks Patty
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Post by madpatty on Jun 28, 2014 21:02:56 GMT -5
Thanks Racket,
What are your thoughts on Straight Diffuser blades rather than those wedge type? They are easy to fabricate in absence of mill....
Thanks Patty
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Post by madpatty on Jun 28, 2014 8:44:02 GMT -5
Hi Racket,
How much does the clearance between tips of NGV and Turbine inducer tips matter....? Is there anything to be taken care of in it
My turbine inducer is 70 mm and what it NGV is kept at say 80mm diameter?
Thanks, Patty
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Post by madpatty on Jun 28, 2014 3:00:48 GMT -5
Nice looking Parts :-)
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Post by madpatty on Jun 27, 2014 8:39:26 GMT -5
Progress update: Work on the NGV's almost done.... Very tiring working with stainless and above that when you dont have right tools for the job... Will be fabricating the plate for the evaporator tubes tomorrow... ANy suggestions on the number and diameter of EVAP tubes are welcome... Cheers, Patty
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Post by madpatty on Jun 27, 2014 3:38:09 GMT -5
Hi Racket,
What thickness NGV are enough to endure the heat in the engine....?
Thanks, Patty
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Post by madpatty on Jun 26, 2014 22:04:24 GMT -5
Hi Racket,
I am facing the difficulty of how to lubricate the thrust bearing.... In my case it is half moon like structure....
I am not getting how to supply it the pressurised oil and how to arrange the drainagle of the oil....?
Thanks, Patty
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Post by madpatty on Jun 26, 2014 21:24:47 GMT -5
Thanks Racket, I will try to keep the diffuser and outer casing at an optimum level..
Hopefully it helps!
Cheers, Patty
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Post by madpatty on Jun 26, 2014 12:16:55 GMT -5
Hi, A very basic question was originating inside my mind for quite some days now as soon as i started designing the diffuser for my engine...
Will there be any advantage/disadvantage of using longer radial length of the wedges for the diffuser(keeping the throat area same).....i.e. increasing the overall diameter of the engine including the diameter of the flametube...??
Just wanted to be on the safer side if there is any advantage like better air flow inside engine etc.
Thanks, Patty
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Post by madpatty on Jun 24, 2014 21:35:15 GMT -5
An update on the progress so far... Had the shaft tunnel completed along with the Stainless steel plate to which NGV blades will be welded....(calculations had been done).... Will complete that NGV work today and post the pics... Cheers, Patty
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Post by madpatty on Jun 24, 2014 15:22:49 GMT -5
Hi Racket, Today i rechecked all my calculations starting from the diffuser till the NGV section throat area...you mind if you can have a look at them and tell me if they are towards the correct side??
1.Assuming the mass flow of 40lbs/min(0.30kg/sec) at 3.0 pressure ratio and 75% efficiency....(ambient 30 degree celsius taken) 2. density of air at compressor outlet comes out to be 1.6477kg/m3 at 98 degree celsius. 3. outflow angle becomes 17 degree. 3. Assuming negligible density changes between the compressor outlet and diffuser inlet:- radial area at diffuser inlet becomes equal to radial area of compressor outlet(i.e 1320 mm2) therefore throat area = radial area * sin(17degree) 4. Throat area comes out to be 1320 * sin(17) = 385 mm2 5. Throat width in my case is 5 mm and wedge axial length is 5 mm. Total 15 wedges and this corresponds to throat area of 375 mm2.
Was tHE ABOVE STEP CORRECT ??
After performing detailed calculation regarding the NGV section:- 1. assuming NGV inlet temperature of 650 degree celsius and reaction level of 0.5. 2. Gas density at turbine 0.715 kg/m3 and at outlet 0.47 kg/m3.
CALculating the NGV's area now:- It comes out to be 860 mm2(0.00086m2)
NOW is this the NGV throat area or we have to again use some (*sine(angle)) to get the throat area as we did in the diffuser case.??
Thanks, Patty
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Post by madpatty on Jun 23, 2014 21:37:04 GMT -5
Thanks Racket,
But the bearings i will be making full compliment arrangement of are Radial Deep Groove bearings(not angular contact).... Do the whole same process goes for Radial bearings also?
Thanks, Patty
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Post by madpatty on Jun 23, 2014 20:24:42 GMT -5
Thanks Racket,
I can do that but won't the balls or the bearing get damaged because the balls wanting to come out from that ground lip while the bearing is running..?
Thanks, Patty
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