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  1. radomir

    Turbine design for fruit hoover

    Since nobody cared to reply let us (you and me) steer-up the matter a little bit. I can't help you regarding the essence of the problem but I may clear couple of things and luckily draw some attention to the problem If I've understood you correctly you would like to make a device for...
  2. radomir

    Ideal expansion in heat engine?

    Expansion is limited by thermodynamic characteristics of the working media (gas making work)and ambient conditions where it is exhausted to. In other words the exhaust total pressure (dynamic + static) has to be larger than surrounding ambient pressure. Thus it would be nice to have expansion...
  3. radomir

    ultrasonic welding of contaminated parts

    I am not familiar with ultrasonic welding at all, but I am a little bit familiar with ultrasonic cleaning. Therefore I would recommend ultrasonic cleaning before ultrasonic welding.
  4. radomir

    Mixed Flow Turbine Phenomena.

    Supposedly a term mixed flow means that beside steam there are water droplets (two phase flow). That could happen in low pressure stages when vapour (steam) temperature drops significantly and it is highly undesired. Those droplets are damaging blades and it is a kind of "cavitation&quot...
  5. radomir

    HORSEPOWER LOSS IN TRANSMISSSION

    My wild guess is that in a manual transmission at nominal RPM (max power) loss is about 5% and in an automatic loss is let say doubled, 10%. Let us hear the comments.
  6. radomir

    BTU Value in Crude Oil Vapors

    The question is rather simple but the answer is not. Lower thermal (heating) value of that mixture of gaseous hydrocarbons and air depends on amount and nature of hydrocarbons. In other words depending on temperature and pressure in a tank and certainly type of the oil plays a role in it...
  7. radomir

    aerospace materials

    For a quick and naturally brief reference of materials there is SAE AMS INDEX published every six months meaning it can’t be so expensive. It gives AMS designation, principal composition, type of semi-fabricate and type of heat treatment-condition of supply (for metal alloys). For metals it...
  8. radomir

    Aluminum arc welding

    Welding and spraying are not the same. Make up your mind are you welding or e.g. thermal spraying.
  9. radomir

    laser welding on enamelled steel, S

    I suppose that enamel should be stripped before welding? At least 0.5 inch around the weld.
  10. radomir

    Birdstrike Analysis

    Well I am neither aware what "ALE approach" is nor what “IS-dyna analysis” is but in engine world bird-strike (ingestion) testing is part of type approval tests. Once upon a time no "jello birds" but real ones, although already deceased, were launched into a running engine...
  11. radomir

    Rothalpy

    Sir Riaan, Hopefully Mr Dixon’s book will be of some help. I’ve searched the Internet (using Google) a little bit and look what I have found: http://www.google.ca/search?q=cache:1qrAWUQPFe8J:www.ts.ctw.utwente.nl/kruyt/rs2/rs2notes.pdf+rothalpy&hl=en&ie=UTF-8 Unfortunately I was able to open...
  12. radomir

    Rothalpy

    ...or impeller of a centrifugal compressor) is equal to the stagnation enthalpy rise, which expressed by Euler’s pump equation looks like: delta W = *ctang2-U1ctang 1 = h02- h01 delta W is that specific work done per unit mass of fluid U1, U2 are blade speeds at inlet and outlet points of a...
  13. radomir

    Variations in stator currents on AC generator

    It is obviously a problem of the electrical generator. Something is wrong with it: either OEM has forgotten to do some necessary tuning between phases (e.g. adjust resistance) or maybe you were supposed to do some fine adjustments. Those are only wild guesses of a mechanical engineer but...
  14. radomir

    H2/O2 seperation membrane with electrolite

    Once upon a time when I was a kid we did water electrolyze experiment in a school. No membrane was used, only those laboratory test tubes over the electrodes, one captivating O2 (probably on anode but being a mechanical engineer also I am not to be trusted in this electro-chemical matters) and...
  15. radomir

    "BALANCE SHAFT CALCULATION"

    ...the maximum 2nd order free forces (in Top and Bottom DCs) you have already calculated. Centrifugal force of rotating excentric mass is: Fc = m*r*w^2 where: m is amount of excentric mass (the both masses in this case) r is distance between axis of rotation (balance shaft axis) and CG...
  16. radomir

    "BALANCE SHAFT CALCULATION"

    Have a look at this: http://autozine.kyul.net/technical_school/engine/smooth2.htm It might be of some help
  17. radomir

    Hydraulic Power Recovery

    There are peek hydro power stations operating like that. They are called “reversible” as far as I remember. During periods of low power demand they pump water in a reservoirs-lakes well above their level but at demand peeks they operate as turbines. Therefore when operating as a pump that...
  18. radomir

    turbine compressor seals

    I assume that you are interested in gas turbine (GT) air seals. Mostly they are labyrinth seals and I would dare to say that they are more air flow metering features (like some strange kind of metering orifices) than seals. In fact those seals meters portion of the compressed air flow, which...
  19. radomir

    Cooling the air at the inlet to a compressor

    In case of stationary gas turbines (industrial or marine) having two-spool gas generator (meaning low and high pressure compressors, each powered by its own turbine) air intercooler could be encountered. Increases efficiency of the compressor (which is axial in most of the cases) reducing...
  20. radomir

    Supersonic Lift/Drag Ratio

    I suppose that mentioned Mach 3 cruise speed is at about 50,000 feet.

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