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Post by britishrocket on Apr 3, 2012 9:06:29 GMT -5
Hello Anders,
Yes I have found that with Macor too. I would like to get hold of some of it though just to experiment with. I know what you mean about retirement, there never seems to be enough time. I am hoping to get some work done on setting up my workshop this week.
Thanks,
Carl.
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Post by Johansson on Apr 8, 2012 13:27:58 GMT -5
Have you been studying ablative liners?
It would be interesting to know more about suitable materials, how it is applied and so on. For a disposable rocket engine it feels like the best way of keeping the thrust chamber from melting, no external means of chamber cooling and lightweight.
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Post by britishrocket on Apr 9, 2012 4:01:52 GMT -5
Hello Anders,
I have looked into the idea of ablative liners and I'm interested in anything that reduces the heat transfer, which was why I was interested in your ceramic coating.
I have seen quite a few examples of graphite liners on the net in small engine projects like ours. I have also seen them in more professional experimental set ups. They normally seem to be bonded into a steel outer casing by some sort of RTV sealant.
I have also seen examples of fibre glass ablative liners that can be replaced. I think though that initially I am going to go with my steel chamber with water cooling. I want to measure the wall temperatures and the water temperatures to get an idea of the amount of heat transfer. This is sometimes called a "calorimeter chamber". I am very interested in how different injection schemes affect the heat transfer. This is because I think that with the right injector the heat transfer can be brought within controllable limits. The coaxial type is especially good in this regard.
There is a type of injector called a vortex injector which has been tested and the walls of the chamber were cool to the touch. I managed to get a vortex like flow in one of my injector experiments, when I put the gas flow through the central post and swirled it, and put the liquid on the outside. It is all interesting stuff and I am working on an injector design that can be easily reconfigured to check different types. I am hoping to get some more posts on my blog reporting on my injection experiments by the end of this week.
I have also been looking at ways in which cooling can be enhanced, and I have been checking out methods used in fusion reactors (tokamaks) which have very tricky cooling problems. I shall report on this in due course also.
In the meantime I'm still trying to get my workshop up and running again...it is my priority at the moment so sorry for the lack of blog posts!
Best Wishes,
Carl.
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Post by britishrocket on Apr 18, 2012 8:25:30 GMT -5
Hello Rocket Developers, I have just posted a report on my blog dealing with the MAX6675 Thermocouple IC and a K type thermocouple. I have interfaced these with an mbed microcontroller to give a temperature display. I intend to use this device to measure temperatures in the rocket engine injector head and chamber flanges. www.britishreactionresearch.blogspot.comI hope you will find something useful here. Best wishes, Carl. |
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Post by britishrocket on May 20, 2012 14:12:28 GMT -5
Hello all,
Just a quick update. Sorry for the dearth of posts. Essentially a lot of personal stuff happening and work intervening.
My new workshop is getting there, all painted out now and I'm hoping to start positioning my machines in the next few weeks.
I will keep you posted. Anders...sorry for not getting back to you re the heat transfer calcs, will try to get on to that as soon as possible!
Carl.
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Post by Johansson on May 20, 2012 14:21:07 GMT -5
No probs, I am busy with the gas turbine so I haven´t had much time to think about the rocket engine lately.
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GrantB
Junior Member
Joined: February 2012
Posts: 61
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Post by GrantB on May 20, 2012 16:00:20 GMT -5
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Post by britishrocket on May 21, 2012 5:22:14 GMT -5
Hello,
Thanks Anders, hope your gas turbine stuff is going well. Thank you for the link and info Grant, I will look into the Zirconia paint. Sounds intriguing!
Carl.
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Post by britishrocket on May 23, 2012 16:47:54 GMT -5
Hello everyone,
It seems to be taking me a long time to collate all my experimental data and produce a post on the shear coaxial injector tests. So I thought I would post a picture of the unit running, for your eyes only, so you can see what it is capable of and the quality of atomisation produced. As can be seen the spray is almost see through about 30mm from the outlet of the injector.
The fluids in use are water as the fuel simulator and argon to simulate the oxidiser. Flow rates are approximately 0.1 lb/sec water and 0.2 lb/sec argon.
More information will (eventually) appear on the blog!
All the best,
Carl.
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Post by britishrocket on May 23, 2012 16:51:07 GMT -5
Here is the picture, for some reason I can't load it correctly from my location....grrr.... Attachments:
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Post by Johansson on May 23, 2012 23:03:58 GMT -5
Sweet mother of all spray patterns, that is what I call atomisation!
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Post by britishrocket on May 27, 2012 8:51:25 GMT -5
Hello Anders,
Thank you very much. This is only the beginning. I am still actively refining the injector design in an attempt to get as much C* efficiency out of the research engine as I can, along with the conflicting aim of having it run cool enough to last for multiple firings. I am still working on my blog post and I may post further pictures and details here, for you to see. It will depend on how much progress I make with the posts.
Thanks again for your interest, hope all is going well with your Rocket and Turbine work.
Carl.
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Post by britishrocket on Jun 14, 2012 7:18:16 GMT -5
Hello Everyone,
A quick update. I am still working on the design for the configurable injector and the post dealing with further injection experiments.
The configurable unit will likely be a gas centred design, that is to say the oxidiser (GOX) will be delivered through the central post. This design prevents neat oxidiser reaching the chamber walls and causing overheating and erosion problems.
There should be a blog post in the next few weeks.
Carl.
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Post by britishrocket on Jun 18, 2012 2:52:55 GMT -5
Hello all, I thought you might like to know that a copy of John D. Clark's excellent book "Ignition!" is available online as a pdf. I came across the link whilst browsing the rocketeers.co.uk site. Here it is:- library.sciencemadness.org/library/books/ignition.pdfThis is an excellent read full of interesting and useful information. Best wishes, Carl. |
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Post by britishrocket on Sept 17, 2012 1:54:48 GMT -5
Dear Rocketeers, I haven't posted for a while. I have been busy reinstating my workshop. This is now complete, and work on the engine will recommence. The configurable injector design is now at a point where it can be manufactured. I had a problem with my lathe and I have posted about this on the blog. Though not strictly engine related I did this for the benefit of any fellow Yahoo Harrison Lathe Group members. You can see the post here:- britishreactionresearch.blogspot.co.uk/The posts detailing the Shear Coax Injector experiments are now ready and will follow shortly. |
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