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Fan-System Curve Matcher

Visualize the fan-curve and duct-system curve intersection to estimate operating flow and pressure rise.

visual calculatorTurbomachinery & Rotating Flow

Read the flow shape before trusting the number.

This page turns a CFD setup into regime, scale, and dominant-effect cues. Adjust the calculator below and compare the moving graphic with the computed result.

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input scale
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model
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check
fan curvesystem curveduct flowoperating point
formula
KaTeX rendered
Delta p_fan ˜= Delta p0 [1 - (Q/Qmax)ˆ2]Delta p_system = K Qˆ2\begin{aligned}\text{Delta p\_fan \~{}= Delta p0 [1 - (Q/Qmax)\^{}2]}\\[0.35em]\text{Delta p\_system = K Q\^{}2}\end{aligned}
ASCII sourceDelta p_fan ~= Delta p0 [1 - (Q/Qmax)^2], Delta p_system = K Q^2
fan curve and system curvefansystemQDelta p
operating Q (m3/s)
1.3184
operating dp (Pa)
417.167
fan dp at Q (Pa)
417.167
air power (W)
549.996
scaled Qmax
1.8000

Use for HVAC/duct CFD boundary estimates. Real fan curves should replace the parabolic surrogate when available.

fan curvesystem curveduct flowoperating point