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Make CentrifugalPump compatible with OpenModelica #281

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Make CentrifugalPump compatible with OpenModelica #281

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14 changes: 6 additions & 8 deletions ThermofluidStream/Processes/Internal/CentrifugalPump/Auxiliaries/res_detadV.mo
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Original file line number Diff line number Diff line change
@@ -1,17 +1,15 @@
within ThermofluidStream.Processes.Internal.CentrifugalPump.Auxiliaries;
function res_detadV "Residuum of derivative of efficiency with respect to volume flow rate"
extends Modelica.Icons.Function;
extends Modelica.Math.Nonlinear.Interfaces.partialScalarFunction;
input Real ch[3] "Coefficients of head polynomial";
input Real cp[3] "Coefficients of power polynomial";
input Real Vn "Normalized volume flow rate";
output Real res "Residuum";
protected
Real N = (ch[1] + ch[2]*Vn + ch[3]*Vn^2)*Vn "Numerator";
Real dN = ch[1] + 2*ch[2]*Vn + 3*ch[3]*Vn^2 "Derivative of numerator with respect to Vn (normalized flow)";
Real D = cp[1] + cp[2]*Vn + cp[3]*Vn^2 "Denominator";
Real dD = cp[2] + 2*cp[3]*Vn "Derivative of denominator with respect to Vn (normalized flow)";
Real N = (ch[1] + ch[2]*u + ch[3]*u^2)*u "Numerator";
Real dN = ch[1] + 2*ch[2]*u + 3*ch[3]*u^2 "Derivative of numerator with respect to Vn (normalized flow)";
Real D = cp[1] + cp[2]*u + cp[3]*u^2 "Denominator";
Real dD = cp[2] + 2*cp[3]*u "Derivative of denominator with respect to Vn (normalized flow)";
algorithm
res := D*dN - N*dD;
y := D*dN - N*dD;
// eta = rho*g*h*V/P = eta_ref*(ch[1] + ch[2]*Vn + ch[3]*Vn^2)*Vn/(cp[1] + cp[2]*Vn + cp[3]*Vn^2) (@ w = w_ref, rho = rho_ref)
// eta = N/D (numerator/denominator)
// -> deta/dVn = 0 -> D*dN - N*dD = 0
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2 changes: 1 addition & 1 deletion ThermofluidStream/Processes/Internal/CentrifugalPump/Measurements/GenericPump.mo
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Expand Up @@ -6,7 +6,7 @@ record GenericPump "Generic measurement data record for centrifugal pumps"
parameter SI.Density rho_ref(displayUnit="kg/l") = 1000 "Reference density";
parameter SI.AngularVelocity w_ref(displayUnit="rpm") = 314.1592653589793 "Reference angular velocity"; // 3000 rpm
final parameter Integer N = size(V_flow,1) "Number of data points";
parameter SI.VolumeFlowRate V_flow[:](displayUnit="m3/h") = {0,2.777777777778e-3,4.166666666667e-3} "Volume flow rate data points"
parameter SI.VolumeFlowRate V_flow[:](each displayUnit="m3/h") = {0,2.777777777778e-3,4.166666666667e-3} "Volume flow rate data points"
annotation (Dialog(group="Volume flow rate")); // {0,10,15} m3/h
parameter Boolean setHead = true "= true, if head data points shall be given (= false, if pressure difference shall be given instead)"
annotation(Dialog(group="Head/Pressure rise"),Evaluate=true, HideResult=true, choices(checkBox=true));
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