Landracing Forum Home
November 23, 2017, 08:54:38 PM *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
News:
BACK TO LANDRACING.COM HOMEPAGE
 
   Home   Help Search Calendar Login Register  


(Note: Donations are not tax deductible)







Live Audio Streaming and Archives of Past Events
Next Live Event: TBD
Pages: 1 ... 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 [98] 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117   Go Down
  Print  
Author Topic: APS/Ω Gas turbine bike build  (Read 395760 times)
0 Members and 1 Guest are viewing this topic.
Mobacken Racing
Sr. Member
****
Offline Offline

Age: 36
Location: Östersund - Sweden
Posts: 808


Turbine junkie


WWW

Ignore
« Reply #1455 on: October 30, 2016, 04:36:15 PM »

Great work Anders!

I have been following your overhaul-schedule a bit and you seem to run into those blockages quite a lot? Any idea to why this happens? Is the solder melting due to the heat or is it just some dirt/debris/residue in the fuel system?

(Sorry if you have answered this question earlier, but I couldn't find an answer so far...)

Cheers,
Greg

Hi Greg,

I don´t know for sure, but my guess is that the kero boils off inside the fuel manifold from the heat stored in the engine after a run, this results in soot particles that end up blocking the small diameter syringes.

The new syringe injectors are larger in diameter than the old ones, so hopefully any dirt will pass through them into the engine. I will take a reference fuel pressure at 1bar boost pressure when the engine first is started, this way I can see if there are any blocked injectors. If so the fuel pressure needs to be higher to get the engine up to the 1bar boost pressure.

The JU-02 engine I am in the process of building will have an external fuel manifold so I can remove any single injector for inspection and cleaning without having to remove the engine from the bike.

Cheers!
/Anders
Logged
bbarn
Sr. Member
****
Offline Offline

Age: 47
Location: Harmony, PA
Posts: 615





Ignore
« Reply #1456 on: October 31, 2016, 09:52:52 AM »

Any chance of catching bleed air at shutdown and blowing it through the injectors? Might be beneficial in the long run to clear the system beyond the fuel pump and remove any fuel particles/soot sources from the system.
Logged

I almost never wake up cranky, I usually just let her sleep in.
Mobacken Racing
Sr. Member
****
Offline Offline

Age: 36
Location: Östersund - Sweden
Posts: 808


Turbine junkie


WWW

Ignore
« Reply #1457 on: October 31, 2016, 01:19:11 PM »

Any chance of catching bleed air at shutdown and blowing it through the injectors? Might be beneficial in the long run to clear the system beyond the fuel pump and remove any fuel particles/soot sources from the system.

That would only complicate the plumbing and add the risk of dirt entering the fuel manifold from the unfiltered compressor discharge air.

It is not really a problem since I only race the bike once or twice every year and tear it down during off season to check the  engine for signs of wear or cracks in the hot section. No extra trouble doing a quick propane flame check and possibly exchange one or two injectors.

Cheers!
/Anders
Logged
JoshH
Full Member
***
Offline Offline

Posts: 118




Ignore
« Reply #1458 on: October 31, 2016, 03:21:22 PM »

Curious. What's your plan to compensate for the larger injectors?
Logged
Mobacken Racing
Sr. Member
****
Offline Offline

Age: 36
Location: Östersund - Sweden
Posts: 808


Turbine junkie


WWW

Ignore
« Reply #1459 on: October 31, 2016, 04:46:52 PM »

Curious. What's your plan to compensate for the larger injectors?

You mean how to adjust the fuel rate to make the engine run as before?

I´ll simply back off on the PWM controller a tad to lower the fuel pump revs, a gas turbine is similar to a diesel engine in that the A/F ratio is self adjusting. The more fuel you feed it the faster it´ll spin, it is as simple as that. No tricky balancing act like with a petrol engine where you have to tune a carb or map the fuel injection.

Cheers!
/Anders
Logged
Mobacken Racing
Sr. Member
****
Offline Offline

Age: 36
Location: Östersund - Sweden
Posts: 808


Turbine junkie


WWW

Ignore
« Reply #1460 on: October 31, 2016, 04:47:12 PM »

With the new injectors in place I had no reason to keep the engine in pieces any more, so I started assembling it tonight.



Thr hot side looks remarkably healthy considering the abuse it has been through over the years.



The compressor must have digested something during the last race, the leading edges in the inducer blades had several small dents that I blended out with a small file. I might fit a new compressor wheel after next years racing depending on how much damage the water injection will do to it.



I borrowed a boroscope to check the gearbox internals for wear, the gear mesh wear looks ok to me but I think I´ll tighten it up a tenth of a millimeter or so since there is a bit much shaft play rotation wise before the teeths interact. It might be a tad larger than last year, perhaps because the shafts and everything has settled in properly after last years assembly.



Cheers!
/Anders
Logged
Mobacken Racing
Sr. Member
****
Offline Offline

Age: 36
Location: Östersund - Sweden
Posts: 808


Turbine junkie


WWW

Ignore
« Reply #1461 on: November 05, 2016, 02:16:14 PM »

A couple of evenings ago I assembled the engine and took a few pics of the thread locking and other stuff you´ve seen a dozen times before, but all of a sudden the SSD drive in my Macbook burned out...

Luckily I had made a copy of the hard drive only a few days before so I managed to restore almost everything on the computer, if not 20 years of project pictures, videos, turbine info, family pics etc etc would have been forever lost. Moments like this makes you realize just how much important stuff from your life that is being stored on computer drives...



I went outside and took these pics to show that the engine is installed in the bike again, look just how much space there is now! Fitting the engine before was a tight fit for sure but now it can just be placed there without any problem at all. Nice! Smiley



Cheers!
/Anders
Logged
Mobacken Racing
Sr. Member
****
Offline Offline

Age: 36
Location: Östersund - Sweden
Posts: 808


Turbine junkie


WWW

Ignore
« Reply #1462 on: November 06, 2016, 03:22:50 PM »

Logged
Mobacken Racing
Sr. Member
****
Offline Offline

Age: 36
Location: Östersund - Sweden
Posts: 808


Turbine junkie


WWW

Ignore
« Reply #1463 on: November 07, 2016, 04:46:39 PM »

I am working on making the fuel and oil lines now, with them in place I can start planning for 3D printing an air intake bellmouth and have a water injection manifold strapped to it.

The fuel filter was fitted tonight along with some oil lines.



I am still waiting for the fuel pressure gauge that will be fitted to the threaded adapter just downstream the filter, hopefully it will turn up soon along with some other stuff I´ve ordered.



I ran out of AN6 braided hose so I need to buy a couple of meters more before I can finish the oil lines.

Cheers!
/Anders
Logged
Mobacken Racing
Sr. Member
****
Offline Offline

Age: 36
Location: Östersund - Sweden
Posts: 808


Turbine junkie


WWW

Ignore
« Reply #1464 on: November 12, 2016, 04:50:13 PM »

I made a water injection spray nozzle holder last night.



I have another of these nozzles so in case one can´t flow enough it is a simple task fitting a second one to the water injection system.



I test flowed it with the small membrane pump I bought for this and got a flow rate of 0.8L/min at an unknown but supposedly not very high pressure, the spray pattern was a bit weak so I think that a better pump will improve both flow and spray pattern quite a bit.



I welded on a pair of AN6 fittings to the water tank and nozzle manifold today so I could do another flow test with my much larger Flojet pump that I used as an oil pump for my old jetcart.



Tank fitting welded and old kero boiling off inside the tank, Anna told me I smelled wonderful when I got back in the house. Smiley



This time the nozzle performed much better, 1.2L/min at 6.5kg water pressure with a pretty nice spray pattern.



In theory I could have two of these but I think I´ll try a single one first to see what happens. Smiley

Cheers!
/Anders
Logged
Mobacken Racing
Sr. Member
****
Offline Offline

Age: 36
Location: Östersund - Sweden
Posts: 808


Turbine junkie


WWW

Ignore
« Reply #1465 on: November 14, 2016, 04:50:53 PM »

Now that I know that the pump can flow enough water through the nozzle with a decent spray pattern I can start fitting the water injection system to the bike.



Last night I modelled a pump bracket in Inventor and started a 10 hour print before I went to bed, and when I got back from work this afternoon the bracket was waiting for me in the 3D printer. Neat! Smiley



After cleaning out some supports in the zip tie holes and threading two holes for M5 screws the bracket was finished.



Here the water pump is fitted to the upper frame tube, a good place to put it now that the air intake tunnel is out of the way.



I also fitted the water injector to the bike.



The angle is set so the center of the spray cone hits the compressor inducer slightly below the compressor hub.



Knowing that the tractor pulling guys inject massive amounts of water into their diesel turbos with little or no atomization of the water (some times just a plain water nozzle pissing water into the compressor inlet) I think this will work just fine. We´ll soon find out. Smiley

Cheers!
/Anders
Logged
Glen
Global Moderator
Hero Member
***
Offline Offline

Age: 82
Location: South West Utah
Posts: 6927

SCTA/BNI timer 1983 to 2004, Retired,. Crew on Tur



« Reply #1466 on: November 14, 2016, 05:47:59 PM »

You are running out of room for any more parts and pieces, maybe a side car, LOL. to carry more. evil
Logged

Glen
Crew on Turbinator II

South West, Utah
Mobacken Racing
Sr. Member
****
Offline Offline

Age: 36
Location: Östersund - Sweden
Posts: 808


Turbine junkie


WWW

Ignore
« Reply #1467 on: November 14, 2016, 05:59:15 PM »

You are running out of room for any more parts and pieces, maybe a side car, LOL. to carry more. evil

Actually there is plenty of room now that I retired the air intake tunnel. smiley
Logged
Mobacken Racing
Sr. Member
****
Offline Offline

Age: 36
Location: Östersund - Sweden
Posts: 808


Turbine junkie


WWW

Ignore
« Reply #1468 on: November 15, 2016, 03:21:08 PM »

Today I think I assembled the last steel braided hose for a while, there must be a kings ransom in AN couplings on the bike by now...



I made a hose from the water tank to the pump and onward from the pump to the spray nozzle, I considered fitting a pressure gauge somewhere between pump and nozzle but decided not to since I can´t look at it while riding the bike anyway.



Time to start sorting the wiring out! smiley

Cheers!
/Anders
Logged
saltwheels262
Hero Member
*****
Offline Offline

Age: 63
Location: cumberland plateau
Posts: 1059


LTA 7/2013




Ignore
« Reply #1469 on: November 15, 2016, 07:54:56 PM »

I can´t look at it while riding the bike anyway.

It might come in handy when it is on a stand during a test fire.

Franey
Logged

bub '07 - 140.293 a/pg   120" crate street mill  
bub '10 - 158.100  sweetooth gear
lta  7/11 -163.389  7/17/11; 3 run avg.-162.450
ohio -    - 185.076 w/#684      
lta 8/14  - 169.xxx. w/sw2           
'16 -- 0 runs ; 0 events -- made a 2 state change in ZIP codes

" it's not as easy as it looks. "
                            - franey  8/2007
Pages: 1 ... 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 [98] 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Simple Audio Video Embedder
Valid XHTML 1.0! Valid CSS!


Google visited last this page November 20, 2017, 05:41:42 AM