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  1. rotw

    HELP! Suggest me a Thesis in Aerospace management with an engineering focus

    Ah, it has been moved here. I was wondering where the thread has been moved. By the way, sorry for the off topic, can someone let me know how one can delete his account from eng-tips? or point me to a link? thank you very much! If you plan an escape, you must succeed as if you fail, you will...
  2. rotw

    HELP! Suggest me a Thesis in Aerospace management with an engineering focus

    The considerations I have put forward were not intended do deny a place to fundamental research which I think has crucial role also in the terms you described. Definitely. However and more generally speaking (that is just my view) I would expect some kind of breakdown with applied research being...
  3. rotw

    HELP! Suggest me a Thesis in Aerospace management with an engineering focus

    makes sense CWB1 I worked for a big corporation in the past, I remember once that I downloaded by accident some folders that belonged to R&D department. The folders contained research topics intended for master or doctorate thesis. I viewed the folder content briefly..before I delete it. I...
  4. rotw

    HELP! Suggest me a Thesis in Aerospace management with an engineering focus

    I think you just provided valuable suggestions to the OP... ok to add "and forums"? If you plan an escape, you must succeed as if you fail, you will be punished for trying. Never say or write down your plan. Heart is the only place where secrecy is granted.
  5. rotw

    HELP! Suggest me a Thesis in Aerospace management with an engineering focus

    Think the OP is just asking for suggestions, should be helped. Something linked to Covid maybe? Something like "Integration of lessons learned into the aircraft production management system in response to black swans (pandemics). The case of a small aircraft sub-supplier company Novelia."...
  6. rotw

    COMPRESSOR

    Few comments on the last post when applied to real world: 1- Seems a valid reasonining at constant efficiency. But absorbed power is function of polytropic efficiency. So, if the operation at higher inlet temperature result on the one hand in operating the compressor in the low efficiency...
  7. rotw

    Some spare time to learn new stuffs...

    CWB1: thanks for the orientation. drawoh: visited Onshape website, sounds interesting, will dig a bit more into it. Good that you brought this aspect, thanks. If you plan an escape, you must succeed as if you fail, you will be punished for trying. Never say or write down your plan. Heart is the...
  8. rotw

    Some spare time to learn new stuffs...

    Hello, I would like to dedicate some spare time to learn some new stuffs (self-learning), so I making a sort of planning (it would be something like 10 hours/week). There are two subjects I am interested in (mostly not as core skills but as transferable skills), but I am not sure which one to...
  9. rotw

    Reducing the mass of a mechanical design

    Make a new cover that is designed similar as a bike wheel (as the concept to ensure stiffness) and then put cover (on one side or both) which would be a thin plate (for protection)??? If you plan an escape, you must succeed as if you fail, you will be punished for trying. Never say or write...
  10. rotw

    Calculate Suction Needed to turn Blower Impeller

    I assume when you mention blower this is referring to a fan type of equipment (thus although not compressible it is not literally a liquid being transferred) and when you mention impeller, I assume it is centrifugal design. When you mention suction pressure value, are your referring to reverse...
  11. rotw

    Compressor design

    Mixed refrigerant example of high head impellers and max. Mach no. that can be attained (see pages 2 & 3 /12) https://www.gti.energy/wp-content/uploads/2018/12/12-6-Antonio_Pelagotti-LNG17-Paper.pdf If you plan an escape, you must succeed as if you fail, you will be punished for trying. Never...
  12. rotw

    Compressor design

    If 2S fresh feed is saturated at dewpoint, then there may be some liquid droplets in it. It will take a few seconds for these droplets to vaporise after mixing with 1D superheated gas. This vaporisation time can only be enabled in the 2S drum. Inline mixing in the pipe ( without drum) wont...
  13. rotw

    Compressor design

    1- The question should not be asked in those terms. It boils down to the bearing span (L) and average shaft diameter under impellers (D). A rule of thumbs is to have a stiffness ratio (L/D) lower than 10. But this a very basic screening. A selection/design is validated when it passes Level I...
  14. rotw

    Compressor design

    You're welcome. If you plan an escape, you must succeed as if you fail, you will be punished for trying. Never say or write down your plan. Heart is the only place where secrecy is granted.
  15. rotw

    Compressor design

    right it is t/h. Ok, something like this: 4 x 900 mm + 1 x 630 mm + 1 x 900 mm Absorbed power ~ 6.8 MW (total) Rated speed ~ 5500 rpm. 1st impeller 3D high Mach followed by conventional 3D or a 2D. The rest are all 2D impellers. At first sight, does not seem to be any problematic...
  16. rotw

    Compressor design

    It is needed the capacity through each stage the machine not just the total at outlet; so you have 1st stage = 80 kg/h through stage 2nd stage = 80 + 80 (injection) = 160 kg/h through stage 3rd stage = 160 + 40 (injection) = 200 kg/h through stage is this correct? If you plan an escape, you...
  17. rotw

    Compressor design

    200 t/h is the inlet rated capacity? it is also needed to know side streams to have the complete pictures. Anyway, this would require a single casing, 6 stage horizontally-split compressor (roughly: 4 x 900 mm + 1 x 650 mm + 1 x 900 mm), with two injections. The 1st two impellers of the 1st...
  18. rotw

    Compressor design

    You did not provide the capacities? Despite this missing information, here are some thoughts: Are looking at the most effective design? see explanation below (referring to multistage centrifugal compressor design; CAUTION: the below preliminary analysis is depending on the flow capacities...
  19. rotw

    Compressor design

    By the way, can you give the pressures, expected temperatures and flow capacity from first suction to final discharge? If you plan an escape, you must succeed as if you fail, you will be punished for trying. Never say or write down your plan. Heart is the only place where secrecy is granted.
  20. rotw

    Compressor design

    except suction at dew point and 2S high flow than 1S discharge Reference to your quote for the part in bold: If you have pure Ethylene (main feed and side stream being identical gases) and side stream is super heated, not even then.

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