ASME venturi for restrictor...

[Nima]

Hi,
It is clear that the flow rate is restricted only by the 20mm throat in the restrictor...
so the main restrictor design is to decrease the head loss due to the passing the restrictor...
I found the ASME veturi tube... it is the standard and optimum for minimum head loss due to mesuring the flow rate...
I really prefer to use this standard for our restrictor...
I think I may make mistake with this...
What's your idea about this?
http://automotive.iut.ac.ir/forum/images/post_images/venturiandnozzles.jpg

[Kamil]

I think you should give it a go. Restrictor design is pretty straight forward. Just make sure you do not have any edges on it ie. make it smooth and continuous, and that the diffuser angle is small enough to prevent flow separation. This angle is well documented to be around 7 deg and can be verified with some steady state CFD using a turbulence model.

[Jersey Tom]

We use it. There's an ASME paper on design of critical flow venturi nozzles.. good stuff.

[Nima]

actually I want to find out the L1 and D from the above image.
How do you find out the Air filter intake diameter (D from the above image) and the throat lenght (L1)...
If it is possible, address that ASME Paper...

thanks