Re: pitot tube
- From: "Paul Hovnanian P.E." <Paul@xxxxxxxxxxxxx>
- Date: Wed, 09 Nov 2005 19:30:28 -0800
"Rich, Under the Affluence" wrote:
>
> On Wed, 09 Nov 2005 23:24:56 +0000, Roger Hamlett wrote:
> > "Zygmunt" <zyganospam@xxxxxxxxxx> wrote in message
> >
> >>I need some informations about pitot tube. I want to build an simply
> >>pitot tube anemometer based microcontroller. How to build pressure
> >>sensor?
> > A 'pitot tube', and an 'anemometer', are two very different bits of kit.
> > All a pitot tube involves, is a tube extending beyond the local skin
> > effects, heading into the incoming air flow. It is used in conjunction
> > with a 'static vent', which is sited into a point on the structure, where
> > the air should be close to the local ambient pressure, and you can then
> > use the pressure difference between these two points as a measure of
> > speed.
>
> OK, there's something I've wondered since I've learned about both the
> pitot tube and the Venturi effect - howcome the Venturi effect doesn't
> suck all of the air out of the static ports, or do they compensate for
> that, and have been doing so since before I was a gleam in Mom's eye?
Basically, a tube, vent or whatever will have air driven into it if it
faces into the airflow (that's what a pitot tube is). It will have air
'sucked out' of it faces away from the airflow. So, they design the
static vent to be at right angles (as close as possible) to the airflow.
--
Paul Hovnanian mailto:Paul@xxxxxxxxxxxxx
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Answer: Eight. Twelve if the light bulb is cross-threaded.
.
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