The background image used in this website shows an optical measurement arrangement to measure the cavitation vapour volume fraction and the spray jet droplet size distribution from the internal flow and spray jets obtained in a 6-hole Diesel injector operating at various accumulator pressures and temperatures, into atmospheric pressure. A Nd:YLF laser is operating with a pulse frequency of 7.5kHz at 527nm wavelength, with a pulse energy of approximately 1mJ/pulse. The laser light is split into 2 laser beams using a 50:50 45deg AOI laser beam splitter. One of the pulsed laser beams is directed across one of the 6 spray jets in order to excite fluorescence in a Rhodamine-B doped Diesel fuel sample. The nearest HS video camera in the background image is set to collect elastic Lorentz-Mie scattered light and long wavelength fluorescence light (560nm – 580nm collection) obtained from one of the six spray jets emanating from the 6-hole Diesel injector. The HS video camera is synchronised with the Nd:YLF laser operating at 7.5kHz. Accurate combination of the fluorescence images with the 527nm images permits the determination of spray droplet size distribution in the spray jet that is being subjected to investigation. The investigation into the properties of the Diesel spray is able to provide quantitative data on Diesel sprays that are formed based on varying composition (conventional Diesel, CTL/GTL Diesel, Diesel with FAME additives etc), anti-corrosion additives, additives for modifying viscosity and/or surface tension etc., fuel temperature and accumulator pressure.

The second laser beam is directed into an optically accessible Diesel nozzle. The fluorescence images that are obtained from Rhodamine-B doped Diesel fuel inside the injector are imaged on the second HS video camera with the long aluminium tube in the background images. The fluorescence images resolve the line-integrated spatial distribution of Diesel fuel inside the injector minisac and nozzle holes with a synchronised frequency of 7.5kHz, thereby providing both time-resolved and 2-dimensional spatially-resolved data on line-integrated fuel concentration inside the Diesel injectors during operation. Once again, this investigation is able to provide quantitative data on the internal flow characteristics of various Diesel fuels with varying composition, anti-corrosion additives, additives for modifying viscosity and/or surface tension etc., fuel temperature and accumulator pressure.

It is known from other research that liquids passing through high pressure nozzles are able to produce large internal pressure gradients that result in local fluid pressure regions that fall below the saturated vapour pressure for the liquid. This causes local supersaturation, which is able to form local vapour bubbles, clouds or sheets when accompanied by nucleation particles or surface irregularities. This type of multi-phase fluid flow is called a cavitating flow. Once the flow pressure recovers, the vapour bubbles, cloud or sheet collapse. Large temperatures, pressures and shock waves occur in the neighbourhood of the collapsing vapour during the collapse, which are able to erode adjacent containment surfaces. This process is known as cavitation erosion, which can result in critical damage to a relevant component.

Cavitating flows obtained in Diesel injectors during fuel injection have a strong effect on the structure and stability of the spray jets that are formed inside the engine cylinder outside of the nozzle holes. They are also capable of choking the amount of fuel delivered to the engine cylinders during injection. Variation of injector geometry and non-Newtonian viscosity modifiers are employed to control nozzle cavitation and the flow and atomization properties of the emergent spray jets.

67 Thoughts to “The Background to our Background Image – Internal Diesel Flows & Sprays”

  1. Excellent article. I definitely appreciate this site. Keep writing!

  2. Good post. I learn something totally new and challenging on sites I stumbleupon everyday. It will always be helpful to read content from other writers and practice a little something from other websites.

  3. Itís hard to come by knowledgeable people for this subject, but you sound like you know what youíre talking about! Thanks

  4. Im excited to find this website. I need to to thank you for your time due to this wonderful read!! I definitely loved every little bit of it and i also have you book marked to check out new stuff in your blog.

  5. Im very happy to find this web site. I need to to thank you for ones time for this particularly wonderful read!! I definitely liked every bit of it and I have you saved to fav to check out new stuff on your website.

  6. Good post. I learn something totally new and challenging on blogs I stumbleupon on a daily basis. Its always useful to read content from other authors and practice something from their websites.

  7. I need to to thank you for this good read!! I certainly enjoyed every little bit of it. I have got you book-marked to check out new things you postÖ

  8. Itís hard to find knowledgeable people for this subject, but you seem like you know what youíre talking about! Thanks

  9. Nice post. I learn something new and challenging on blogs I stumbleupon every day. It will always be helpful to read articles from other authors and use something from their sites.

  10. Hello there! This blog post couldn’t be written much better!
    Going through this post reminds me of my previous roommate!
    He always kept talking about this. I am going to send this post to him.
    Fairly certain he will have a very good read. Thanks for sharing!

  11. Very quickly this website will be famous among all blogging
    people, due to it’s good content

  12. Wow, incredible blog structure! How long have you ever been running a
    blog for? you make running a blog look easy. The whole glance of your web
    site is excellent, let alone the content!

  13. I visited various websites except the audio feature for audio songs present at
    this web page is in fact wonderful.

  14. I am really impressed with your writing skills and also with the layout on your blog.
    Is this a paid theme or did you customize it yourself?

    Anyway keep up the nice quality writing, it is rare to see a great blog like this one these
    days.

  15. Wow, this post is good, my sister is analyzing these kinds of things, therefore I am going
    to convey her.

  16. Your style is unique compared to other folks I’ve read stuff from.
    Many thanks for posting when you have the opportunity, Guess I’ll just bookmark this site.

  17. The next time I read a blog, I hope that it doesnt disappoint me just as much as this particular one. After all, Yes, it was my choice to read, nonetheless I genuinely believed you would have something useful to say. All I hear is a bunch of whining about something that you can fix if you were not too busy seeking attention.

  18. It’s very straightforward to find out any
    matter on net as compared to books, as I found
    this piece of writing at this site.

  19. Ahaa, its pleasant conversation about this paragraph at this place at this
    website, I have read all that, so now me also commenting at this place.

  20. Its like you read my mind! You appear to know so much about this, like you wrote
    the book in it or something. I think that you could do with a few pics to
    drive the message home a bit, but instead of that,
    this is excellent blog. An excellent read. I will definitely be back.

  21. Hi my loved one! I wish to say that this post is amazing, nice written and include approximately all vital infos. I’d like to peer more posts like this.

  22. I loved even more than you will get done right here. The picture is nice, and your writing is stylish, but you seem to be rushing through it, and I think you should give it again soon. I’ll probably do that again and again if you protect this hike.

  23. I do trust all the ideas youve presented in your post They are really convincing and will definitely work Nonetheless the posts are too short for newbies May just you please lengthen them a bit from next time Thank you for the post

  24. Excellent blog here Also your website loads up very fast What web host are you using Can I get your affiliate link to your host I wish my web site loaded up as quickly as yours lol

  25. hiI like your writing so much share we be in contact more approximately your article on AOL I need a specialist in this area to resolve my problem Maybe that is you Looking ahead to see you

  26. Seeing how much work you put into it was really impressive. But even though the phrasing is elegant and the layout inviting, it seems like you are having trouble with it. My belief is that you ought to try sending the following article. If you don’t protect this hike, I will definitely come back for more of the same.

  27. Somebody essentially lend a hand to make significantly articles Id state That is the very first time I frequented your website page and up to now I surprised with the research you made to make this actual submit amazing Wonderful task

  28. Wow wonderful blog layout How long have you been blogging for you make blogging look easy The overall look of your site is great as well as the content

  29. Excellent blog here Also your website loads up very fast What web host are you using Can I get your affiliate link to your host I wish my web site loaded up as quickly as yours lol

  30. Somebody essentially lend a hand to make significantly articles Id state That is the very first time I frequented your website page and up to now I surprised with the research you made to make this actual submit amazing Wonderful task

  31. Its like you read my mind You appear to know a lot about this like you wrote the book in it or something I think that you could do with some pics to drive the message home a little bit but instead of that this is fantastic blog An excellent read I will certainly be back

  32. I have been browsing online more than three hours today yet I never found any interesting article like yours It is pretty worth enough for me In my view if all website owners and bloggers made good content as you did the internet will be a lot more useful than ever before

  33. Hi Neat post There is a problem along with your website in internet explorer would test this IE still is the market chief and a good section of other folks will pass over your magnificent writing due to this problem

  34. Wow superb blog layout How long have you been blogging for you make blogging look easy The overall look of your site is magnificent as well as the content

  35. I have been browsing online more than three hours today yet I never found any interesting article like yours It is pretty worth enough for me In my view if all website owners and bloggers made good content as you did the internet will be a lot more useful than ever before

  36. Somebody essentially help to make significantly articles Id state This is the first time I frequented your web page and up to now I surprised with the research you made to make this actual post incredible Fantastic job

  37. I eagerly started following this amazing site a couple days ago, they have useful content for subscribers. The site owner works hard to inform fans. I’m delighted and hope they continue providing excellent info.

  38. I became a fan of this phenomenal website earlier this week, they give informative content to visitors. The site owner has a knack for educating readers. I’m impressed and hope they keep sharing great material.

  39. I have been surfing online more than three hours these days,
    but I never discovered any attention-grabbing article
    like yours. It’s beautiful value sufficient for me. Personally, if all site
    owners and bloggers made good content as you did, the internet can be
    much more useful than ever before.

  40. Somebody essentially help to make significantly articles Id state This is the first time I frequented your web page and up to now I surprised with the research you made to make this actual post incredible Fantastic job

  41. I have read some excellent stuff here Definitely value bookmarking for revisiting I wonder how much effort you put to make the sort of excellent informative website

  42. This asset is phenomenal. The wonderful information exhibits the maker’s earnestness. I’m stunned and anticipate more such astonishing sections.

  43. Wow, incredible weblog structure! How lengthy have you been blogging for?
    you make blogging look easy. The total look of your web site is wonderful, as neatly as the content material!
    You can see similar: e-commerce
    and here najlepszy sklep

  44. This entrance is fabulous. The magnificent substance reveals the maker’s energy. I’m shocked and anticipate more such mind blowing sections.

  45. Usually I do not read article on blogs however I would like to say that this writeup very compelled me to take a look at and do so Your writing taste has been amazed me Thanks quite nice post

  46. I do believe all the ideas youve presented for your post They are really convincing and will certainly work Nonetheless the posts are too short for novices May just you please lengthen them a little from subsequent time Thanks for the post

  47. I simply could not go away your web site prior to suggesting that I really enjoyed the standard info a person supply on your guests Is going to be back incessantly to investigate crosscheck new posts

  48. obviously like your website but you need to test the spelling on quite a few of your posts Several of them are rife with spelling problems and I to find it very troublesome to inform the reality on the other hand Ill certainly come back again

  49. of course like your website but you have to check the spelling on several of your posts A number of them are rife with spelling issues and I in finding it very troublesome to inform the reality on the other hand I will certainly come back again

  50. Hi Neat post There is a problem along with your website in internet explorer would test this IE still is the market chief and a good section of other folks will pass over your magnificent writing due to this problem

  51. I spent over three hours reading the internet today, and I haven’t come across any more compelling articles than yours. I think it’s more than worth it. I believe that the internet would be much more helpful than it is now if all bloggers and website proprietors produced stuff as excellent as you did.

  52. I do not even know how I ended up here but I thought this post was great I dont know who you are but definitely youre going to a famous blogger if you arent already Cheers.

  53. Your blog post had me hooked from the very beginning!

  54. I have been browsing online more than 4 hours today, yet I never found any interesting article like
    yours. It is pretty worth enough for me. Personally, if all web owners and bloggers made
    good content as you did, the internet will be much
    more useful than ever before.

  55. Fantastic site A lot of helpful info here Im sending it to some buddies ans additionally sharing in delicious And naturally thanks on your sweat

  56. I do not even know how I ended up here but I thought this post was great I do not know who you are but certainly youre going to a famous blogger if you are not already Cheers.

  57. Simply wish to say your article is as amazing The clearness in your post is just nice and i could assume youre an expert on this subject Well with your permission let me to grab your feed to keep updated with forthcoming post Thanks a million and please carry on the gratifying work

  58. Stumbling upon this website was such a delightful find. The layout is clean and inviting, making it a pleasure to explore the terrific content. I’m incredibly impressed by the level of effort and passion that clearly goes into maintaining such a valuable online space.

  59. Somebody essentially help to make significantly articles Id state This is the first time I frequented your web page and up to now I surprised with the research you made to make this actual post incredible Fantastic job

  60. This website has quickly become my go-to source for [topic]. The content is consistently top-notch, covering diverse angles with clarity and expertise. I’m constantly recommending it to colleagues and friends. Keep inspiring us!

  61. Your writing has a way of resonating with me on a deep level. It’s clear that you put a lot of thought and effort into each piece, and it certainly doesn’t go unnoticed.

  62. Its like you read my mind You appear to know so much about this like you wrote the book in it or something I think that you can do with a few pics to drive the message home a little bit but instead of that this is excellent blog A fantastic read Ill certainly be back

  63. you are in reality a just right webmaster The site loading velocity is incredible It seems that you are doing any unique trick In addition The contents are masterwork you have performed a wonderful task on this topic

Leave a Comment