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Recent content by AlexNeo

  1. AlexNeo

    exhaust sampling

    hi!! i am trying to measure PM emssions from a DI diesel engine. my experimental set-up consits of a vacuum pump which and a flow controller to draw in exhaust into the sample chamber of the PM emssions instrument. the set value for the flow rate of exhaust is 5 SLM. but the actual exhaust flow...
  2. AlexNeo

    on board emissions sensors

    hi greg!! isnt soot an issue from DISI engines?
  3. AlexNeo

    on board emissions sensors

    would having on board emissions sensors say for example a HC sensor, a NOx sensor and a soot sensor further help the ECU in reducing emissions? the major input is the lambda value and the ECU needs pretty much that to keep combustion stoichiometric and the catalyst happy. but will on board...
  4. AlexNeo

    charge cooling

    hi!! i am a bit confused about charge cooling and the resulting increase in volumetric efficiency. in a pfi engine there is an air flow sensor upstream of the fuel injector. this sensor tells the ECM the amount of air going through. based on this input the ECM then directs the injector to...
  5. AlexNeo

    Transonic flow over a bump in a channel

    the bump is on the lower wall at the center of the channel
  6. AlexNeo

    Transonic flow over a bump in a channel

    thanks eriksen!! air enters the channel at M=0.675 in the first case. there is a bump at the center of the channel. mach number increase over the bump and a shock appears at the bump-top. so i wated to know the phsysis that leads to this shock. also when air enters the channel at M = 0.5 it...
  7. AlexNeo

    Transonic flow over a bump in a channel

    Hi!! i am doing a CFD simulation of transonic compressible flow over a small bump in a channel. is there someplace i could find the explanation for the different phsical phenomena associated with this flow? i need to explain the the physics behind the results. i looked in the books on...
  8. AlexNeo

    FLUENT or FIDAP

    hi!! what are the advantages/disadvantages in using FLUENT which is a finite volume code over FIDAP which is a finite element code? by advantages i dont mean the user friendliess etc. thanks!
  9. AlexNeo

    FIDAP or FLUENT

    hi!! what are the advantages/disadvantages in using FLUENT which is a finite volume code over FIDAP which is a finite element code? by advantages i dont mean the user friendliess etc. thanks!
  10. AlexNeo

    DI Engines

    hi!! will DI engines ever be used in the US? NOx is a catalyst problem. but are there any developments in the field of catalysts that will solve the probelm? HC's and particulates are related to in-cylinder phenomena such as wall wetting, pool fires and insufficient time for oxidation of...
  11. AlexNeo

    Propane

    hi franzh!! thanks for your reply. but i still dont understand that why we dont abundantly use propane then. good octane rating, low emissions and comparable cost. the volumetric efficiency deficit can be avoided by using liquid propane in PFI engines, right? how is liquid propane prevented...
  12. AlexNeo

    Propane

    thanks greg!
  13. AlexNeo

    Propane

    Is propane always used in gas form or could one inject liquid propane instead of gasoline in a DISI engine. i know propane is a liquid at sub zero temperatures and vapor lock might be an issue. also is propane corrosive-both gas and liquid? i would not expect it to be as there is no oxygen in...
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