Aerospace/Aviation/Expert Profile


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Expertise

I can answer questions regarding aerodynamics, fluid flow, and computational simulations.

Experience in the area

turbomachinery flow analysis, computational fluid dynamics

Organizations

Mississippi State University

AIAA

SIAM

Publications

AIAA SIAM

Education/Credentials

Ph.D. in Aerospace Engineering

Something controversial or provocative about this subject

(yes, that's a "not-so-recent" picture of me................from the 60's)

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Recent Reviews from Users

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    K = Knowledgeability    C = Clarity of Response    P = Politeness
UserDateKCPComments
Michael08/19/14101010Interesting answer!
Mark Dambrosio10/07/13101010Thank you for taking the time to .....
Rimpo08/17/131010Thanks very much for you answer! It .....
jevon03/01/1310 
Wai10/06/12101010 

Recent Answers from Mark Janus

2014-08-18 Fieseler Fi 103 (Vergeltungswaffe):

Hi Michael,  I would venture to say that even at altitude 400mph is under the critical Mach number for the V-1 and hence sweeping the wings would not provide much (if any) benefit.  Swept wings are designed

2014-04-04 Speed of sound:

While it is not impossible, I do not believe it has been done...  most prop planes don't have enough power to overcome the shock losses associated with supersonic flight...    You'd probably have to be

2013-10-01 Rocket engine nozzle pressure:

Hi Mark,    When it is said that a nozzle is optimized when the exit pressure matches the ambient pressure that simply means that the nozzle is designed for that condition... The walls of a (bell-shaped)

2013-08-16 Jet Engines:

Hi Rimpo,    The approximate stochiometric air to fuel ratio is about 15/1 for hydrocarbon fuels...  I believe slightly richer ~12/1 yields the most power... but I don't have my propulsion info in front

2013-05-26 Prop speed:

Since they are direct drive they turn at typical piston engine RPM...  e.g. 2000 - 2500    If you are referring to WWII type aircraft or high performance racing aircraft it's more like 4000-5000    If

 

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