Using a flow coefficient (Cv value) in SymHydraulics

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Luuk Heijnders
Luuk Heijnders 2015-9-9
评论： Luuk Heijnders 2022-1-11
Hi all,
currently I want to use SimScape / SimHydraulics to model a system. For several components I have the Cv value (flow coefficient). This is defined as Q = Cv * sqrt(dp*rho_water/rho_liquid) But I cannot find the correct block to implement it. Any suggestions?
Best regards, Luuk

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回答（1 个）

Jocie Kluger
Jocie Kluger 2021-8-31
One approach could be to use an Orifice block with area and discharge coefficient parameters. The flow rate equation of this block simplifies to Q= Cd*Area* sqrt(2*dp/rho_liquid). You could adjust the discharge coefficient and Orifice area so Cd*Area*sqrt(2) = Cv*sqrt(rho_water). Here are links to the Orifice blocks in the Isothermal Liquid and Hydraulics libraries:
https://www.mathworks.com/help/physmod/hydro/ref/orificeil.html
https://www.mathworks.com/help/physmod/hydro/ref/fixedorifice.html
Alternatively, you could use a Flow Coefficient block in the Thermal Liquid library. Use an Interface (TL-IL) block to interface this block with the Isothermal or Hydraulic network. Don't forget to add a Thermal Liquid properties block to the Flow Coefficient block to specify non-default TL fluid properties.
https://www.mathworks.com/help/physmod/hydro/ref/flowcoefficientparameterizedvalvetl.html
https://www.mathworks.com/help/physmod/hydro/ref/interfacetlil.html

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