Turbomachinery

Gas compression power for centrifugal, axial, and reciprocating compressors. Given suction P/T/flow, discharge pressure, gas properties (MW, κ, Z), and isentropic or polytropic efficiency, computes: isentropic head, polytropic head, shaft power, motor power, discharge temperature, polytropic exponent n, and actual volumetric flow at suction and discharge.

Estimate theoretical pump head using the Euler turbomachine equation from impeller geometry and speed.

Calculate available NPSH to predict and prevent cavitation at the pump inlet.

Calculate dimensionless specific speed to classify pump type (centrifugal, mixed-flow, or axial).

Scale pump performance (flow, head, power) when rotational speed changes using the affinity laws.

Calculate hydraulic and overall pump efficiency from actual head, Euler head, and shaft power.

Calculate hydraulic turbine output power from flow rate, head, and turbine efficiency.

Scale fan performance (flow, pressure, power) with speed and air density changes using fan similarity laws.

Calculate impeller tip (peripheral) speed from diameter and rotational speed.

Calculate suction specific speed to assess cavitation susceptibility of a pump design.

Generate a pipe system H–Q resistance curve, overlay a pump curve to find the operating point. Includes efficiency, shaft power, and affinity-law speed scaling.

Combine two pump H-Q curves in parallel (flows add) or series (heads add). Finds the combined operating point against a system curve via quadratic curve fitting and bisection. Shows individual pump duties, flow/head gain vs single pump, and warns when one pump is cut out in parallel.