A volute cutaway exposes the impeller, axial suction eye, tangential discharge, motor and adjustable system resistance. Match the pump and system curves; inspect flow, shaft power and an illustrative NPSH margin.
• 3D scene parts: Volute casing; impeller and suction eye; motor, shaft and coupling; discharge, throttle and system; suction pipe and reservoir. • Controls: Relative shaft speed (0.5–1.3 × rated); Static system head (0–50 m); System resistance R (2000–30000 s²/m⁵); Peak assumed efficiency (0.4–0.85); Suction reservoir elevation above eye (-5–4 m); Suction loss coefficient (500–5000 s²/m⁵). • Live readouts: Operating flow (m³/s); Operating head (m); Shaft power (kW); Assumed efficiency; Available NPSH (m); Illustrative required NPSH (m); NPSH margin (m). • Guided experiments: Throttle discharge; Insufficient lift; Poor suction. • Four tabs (visual laboratory, curves and measurements, experiments, learn and assess), a model-verification run, a timestamped event log and a trial report.
Hpump=40 r²−10000 Q²; Hsystem=Hstatic+R Q² Q=√[max(40r²−Hstatic,0)/(10000+R)] Pshaft=ρgQH/η NPSHa=(patm−pv)/(ρg)+z−Ks Q² Illustrative NPSHr=2+2[Q/(0.045r)]²
Representative quadratic pump curve, affinity-scaled shutoff head and assumed efficiency map; these are not manufacturer test data. System resistance is lumped. At shutoff, actual pump head is shutoff head, not a delivered flow condition. NPSHr is an illustrative curve. Water at 20°C, sea-level atmospheric pressure; no CFD, cavitation collapse, unstable operation or motor transients. Rotation is slowed and cannot be used as a tachometer. Try the preset experiments, then compare the live readouts with the equations.
No. Higher resistance raises the system curve and reduces its flow intersection.
No. It is a declared teaching curve and must be replaced with equipment data for design.
Representative quadratic pump curve, affinity-scaled shutoff head and assumed efficiency map; these are not manufacturer test data. System resistance is lumped. At shutoff, actual pump head is shutoff head, not a delivered flow condition. NPSHr is an illustrative curve. Water at 20°C, sea-level atmospheric pressure; no CFD, cavitation collapse, unstable operation or motor transients. Rotation is slowed and cannot be used as a tachometer.