Sweetenough
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Posts: 121
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Post by Sweetenough on Nov 25, 2021 2:32:07 GMT -5
Thanks Scott, Yes, I am using the components we talked about. ESP32 seems very promissing (my friend tells me :-) ), for a "complete" control system for an engine it might lack I/O but has much more memory and wifi connection straight out of the box. Correct, the trolleys is made on the CNC mill. It is a fantastic add to the workshopp, slowly but surely I am getting the hang of it. The old ones was just some wooden planks with to small wheels that got stuck all the time. Kind Regards Thomas
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Sweetenough
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Joined: April 2016
Posts: 121
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Post by Sweetenough on Dec 2, 2021 2:27:36 GMT -5
Hi Guys, New fuel pump control unit is soldered together. Time to engergize and check for smoke Hoping to do some tests this coming weekend. Kind Regards Thomas
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slittlewing
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Joined: November 2017
Posts: 458
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Post by slittlewing on Dec 2, 2021 15:03:57 GMT -5
Tidy!! Nice huge heat sinks too. I might have to get the details from you of the link wires and sockets at some point! 😁
Looking forward to test results.
Cheers Scott
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Sweetenough
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Posts: 121
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Post by Sweetenough on Dec 6, 2021 5:56:14 GMT -5
Thanks Scott, Link wires are JST-XH contacts (same as ballance leads on lipo batteries) Powered it up yesterday without any smoke and did some initial tests, seemed to work fine. But then.... when connecting a usb cord and a computer to change some parameters, the computer instantly died. When going to google about this problem it was apparently so that you can not power a ESP32 from several sources at the same time. That works fine for a arduino nano that I previuosly used so I did not expect it to be a problem. But that it could kill a laptop computer when you backfeed 6,5V on the USB port I had no idea. Lets see if the computer is repareable
Kind Regards Thomas
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slittlewing
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Post by slittlewing on Dec 6, 2021 13:30:01 GMT -5
Sorry to hear that Thomas, hope it’s not dead ! I did hear some stories regarding dual power supply with Arduino where people have connected laptop at the same time as external power. I always powered it with 5V regulator from a battery and it was Ok.
Worst case you should be able to still use the hard drive so hopefully you didn’t lose anything! Cheers
Scott
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Sweetenough
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Post by Sweetenough on Dec 9, 2021 3:35:11 GMT -5
The hard drive survived but the "mother board" is toast and it was to expensive to replace considering the general status of the PC So a new laptop it is. Did a modification to the board so I can disconnect the board power supply by removing a jumper. Just a matter of remembering that the jumper must be removed BEFORE the USB is connected Kind Regards Thomas
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Sweetenough
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Posts: 121
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Post by Sweetenough on Jan 13, 2022 4:17:26 GMT -5
After the hiccup with the broken PC the project has now moved forward (with a new PC ) to testing on the vehicle. New fuel modules temporarly connected and tested against the pumps & control system. Everyting seems to work as intended. The setpoint to the PWM modules is 0-15VDC for the combustor and 0-25VDC for the AB, then the new modules controls the PWM signal to meet the demanded output voltage. Hoping to make a test start this weekend. Then finish the last details on the new after burner. Today there was an announcement from the organizer of speedweekend, they have obtained a police permit for the competition! Really hope that the covid situation does not change this Kind Regards Thomas
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Sweetenough
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Posts: 121
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Post by Sweetenough on Jan 17, 2022 7:00:10 GMT -5
Hi Guys, Did some testing of the new fuel PWM control modules yesterday, worked fine. But for some still unknown reasson they are more "powerful" to the turbine governour than anticipated. Need to do some tests and to compare them to the old PWM modules. But that will surly be solved with time, the new PWM modules worked great anyway. Got to try how much fuel the AB could take and it was not much more than I have been running before, at 13,4VDC pump voltage it flamed out. Have run it at maybe 12VDC before that was max with the battery I had. Now the AB runs on a separate Lipo 6S battery making it possible to run at least at 20VDC if needed. Time to get the new AB finished and hope for some more roar. Kind Regards Thomas Test film youtu.be/pr7Sw88_Ua4
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slittlewing
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Post by slittlewing on Jan 17, 2022 16:00:02 GMT -5
Really impressive test run, and great the new parts work well!! What P2 was that at? I am sure it will go faster this year!
Cheers Scott
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Sweetenough
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Post by Sweetenough on Jan 18, 2022 2:58:34 GMT -5
Thanks Scott, @p2 3,1bar 90k rpm
Kind Regards Thomas
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Sweetenough
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Posts: 121
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Post by Sweetenough on Jan 25, 2022 3:42:00 GMT -5
Hi Guys, Just finished the fuel spray ring to the new after burner. A lot of chips where made in in the lathe during the process Had a little bit low welding confidence before I started but it turned out just fine. Puuuh! Nice discolouring after the welding. 10pc 1mm holes to the outside and 5pc 1mm holes to the inside should hopefully give an even spread. Will do some flow testing with water and diesel tonight. Then next up is to install the ring in the after burner and then try to make some noise Kind Regards Thomas
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Sweetenough
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Post by Sweetenough on Jan 26, 2022 1:55:54 GMT -5
Hi Guys, Prepared to do flow test yesterday. Quickly the fuel sprayed everywhere Will have to do some kind of spray containment and then try to meassure the fuel flow at different pwm settings. Kind Regards Thomas
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Sweetenough
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Posts: 121
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Post by Sweetenough on Jan 27, 2022 7:15:48 GMT -5
Hi Guys, Did some more flow tests yesterday, both with water and leafblower outdoors. Looks promising so far: Also did some diesel flow tests in a bucket for a time period and then weight the bucket. Does anybody have a simple flow calculation formula for diesel? I would like to calculate flow and I have the nozzle area and pressure before the nozzle. Kind Regards Thomas
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Post by racket on Jan 27, 2022 15:30:49 GMT -5
Hi Thomas
Love the "action" pic :-)
With your diesel flow calcs , you'd probably need to include the fuel temperature as diesel can get a bit "thick" when cold .
Maybe make up a test piece with a single 1mm hole in a piece of tube to get flow data , much easier to "control" than using the A/B spray ring.
Cheers John
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Sweetenough
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Joined: April 2016
Posts: 121
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Post by Sweetenough on Jan 28, 2022 3:43:05 GMT -5
Thanks John, It is always nice with a visualization Think I managed to find a calcultion formula in a excel sheet from work, I am on really thin ice when solving out flow in the calculation But with an random adjustment of the effective area constant I get the meassured and the calculated values to match. I think I leave it for now and concentrate on finishing the afterburner. With the new 24VDC pump control I am pretty confident that I have enough fuel supply to drown the new after burner. Up to 5MW of fuel Kind Regards Thomas
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