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denniskb
Mechanical
- May 24, 2002
- 90
If you use orifice plates as restriction orifices for compressible fluids and need to know the flow rate then you are probably calculating it incorrectly. Surprisingly there is no readily available method to calculate the flow once the critical pressure ratio is exceeded and orifice plates do not choke like nozzles do. The flow rate continues to change as the downstream pressure is further reduced. Most orifice calculations are only accurate over a very limited range and typical choked flow methods will result in significant error.
I needed an answer for the design of gas compressor stations and found some research done in the early 1950s which proposed a solution but to specific conditions only. I have developed, from these same test results, a generic solution which appears to be correct. It is certainly much more accurate than the conventional calculations.
A paper which explains the method and puts a solution in the hands of the average engineer can be freely downloaded from
Dennis Kirk Engineering
I needed an answer for the design of gas compressor stations and found some research done in the early 1950s which proposed a solution but to specific conditions only. I have developed, from these same test results, a generic solution which appears to be correct. It is certainly much more accurate than the conventional calculations.
A paper which explains the method and puts a solution in the hands of the average engineer can be freely downloaded from
Dennis Kirk Engineering
