Agricultural Centrifugal Pump Test Station
Single-stage end-suction volute pump with transparent acrylic suction and discharge sections.
Agricultural Engineering / Centrifugal Pump Curves
FREE TO EXPLORELABORATORY 16 · AGRICULTURAL ENGINEERING
Agricultural Centrifugal Irrigation Pump Characteristic Performance Curves (H-Q, η)
Determine the head-discharge (H-Q), brake power, and overall efficiency characteristic curves of an agricultural centrifugal pump and verify affinity affinity laws across speeds. Explore interactive farm machinery simulation, irrigation hydraulics, and agricultural engineering telemetry.
FARM MACHINERY · SOIL & WATER · POST-HARVEST · STRUCTURES
Your virtual agricultural engineering laboratory.
SHUTOFF TOTAL DYNAMIC HEAD H_0—
FIELD & TEST CELL TELEMETRY
Ready to sample with (N/1000)² = 2.56 (k-rpm)².
Adjust (N/1000)², then execute agricultural trial.
Agricultural engineering telemetry and biosystems states are evaluated rigorously using 64-bit IEEE 754 precision. Residuals reflect ordinary least-squares regression across successive observations. Continuous data structures support high-fidelity agricultural and environmental modeling.
Agricultural assumptions and boundary condition limits
Affinity laws assume identical internal fluid streamlines and neglect Reynolds number viscosity changes at low speeds. Evaluated using a single-stage end-suction centrifugal pump (impeller diameter D = 160 mm) pumping clean water across speeds from 1000 to 2400 RPM.
Agricultural apparatus & field instrumentation sensors.
Variable-Frequency Three-Phase Electric Motor
Regulates pump rotational speed from 1000 to 2400 RPM with 1.0 RPM digital control.
Suction Vacuum Gauge & Discharge Pressure Transducer
Measures suction head h_s (-kPa) and discharge head h_d (kPa) to calculate total dynamic head.
Electromagnetic Flowmeter & Throttle Gate Valve
Measures discharge Q (L/s) while the downstream throttle valve regulates operating point.
In-Line Shaft Reaction Torquemeter & Optical Tachometer
Measures pump input shaft torque and rotational speed for brake horsepower calculation.
Digital Hydraulic Telemetry Console
Logs pressures, flow, torque, power, and computes real-time pump efficiency η.
FOLLOW THE METHOD
A reason behind every step.
Determine the head-discharge (H-Q), brake power, and overall efficiency characteristic curves of an agricultural centrifugal pump and verify affinity affinity laws across speeds. Standardized parameter settings: 1.0, 1.69, 2.56, 3.61, 4.84, 5.76 (k-rpm)².
01
Pump Priming & Sensor Zeroing
Fill the suction line and pump volute casing with water, bleeding all air through the top vent valve until no bubbles emerge. Zero all pressure transducers at static equilibrium.
02
Initial Speed Setting
Set variable-frequency motor drive to N = 1000 RPM ((N/1000)² = 1.00), leaving the discharge throttle valve fully closed to establish the shutoff point.
03
Shutoff Head Measurement
Record suction vacuum and discharge gauge pressure at zero flow (Q = 0) and compute total shutoff dynamic head H_0 = (P_d - P_s)/(ρ·g) + Δz.
04
H-Q Characteristic Curve Run
At 1750 RPM, systematically open the discharge valve in eight increments from shutoff (Q = 0) to maximum discharge, recording H, Q, shaft power P, and efficiency η.
05
Speed Affinity Stepping
Return throttle valve to shutoff and increment pump speed across five additional stages: 1300, 1600, 1900, 2200, and 2400 RPM, recording H_0 for each speed.
06
Affinity Scaling Regression
Plot shutoff head H_0 against normalized speed squared (N/1000)², perform linear regression through the origin, and determine affinity constant k_N.
YOUR NOTEBOOK · 0 OBSERVATIONS
Turn measurements into agricultural engineering insight.
Points are your recorded observations. The solid regression line validates Centrifugal Pump Curves mathematical scaling.
LINEAR REGRESSION FIT · y = mx + b
H_0 = k_N · (N / 1000)² = 8.2000 · (N / 1000)²
| # | Normalized Pump Speed Squared (N / 1000)² ((k-rpm)²) | Shutoff Total Dynamic Head H_0 (m) | Normalized speed squared (N/1000)² | Shutoff head H_0 (m) | Remove |
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