1. What is the Actual Discharge Formula?

The formula calculates the actual discharge (volume flow rate) at the outlet of a centrifugal pump using the impeller dimensions and flow velocity. It provides the actual amount of liquid outflow from the pump outlet.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Actual discharge at centrifugal pump outlet (m³/s)
• \( \pi \) — Archimedes' constant (approximately 3.1416)
• \( D_2 \) — Diameter of centrifugal pump impeller at outlet (m)
• \( B_2 \) — Width of impeller at outlet (m)
• \( V_{f2} \) — Flow velocity at outlet of centrifugal pump (m/s)

Explanation: The formula calculates the volumetric flow rate by multiplying the cross-sectional area (π×D₂×B₂) with the flow velocity at the outlet.

3. Importance of Actual Discharge Calculation

Details: Accurate discharge calculation is crucial for pump performance evaluation, system design, and ensuring proper fluid handling in various industrial applications.

4. Using the Calculator

Tips: Enter all values in meters and meters per second. Ensure all values are positive and valid for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What units should be used for input values?
A: All dimensions should be in meters (m) and velocity in meters per second (m/s) for consistent results in m³/s.

Q2: How accurate is this calculation?
A: The calculation provides theoretical discharge. Actual performance may vary due to factors like efficiency losses and system characteristics.

Q3: Can this formula be used for other pump types?
A: This specific formula is designed for centrifugal pumps. Other pump types may require different calculation methods.

Q4: What if the impeller has complex geometry?
A: For impellers with non-standard geometry, more complex calculations or experimental measurements may be necessary.

Q5: How does this relate to pump efficiency?
A: Actual discharge is one component in calculating pump efficiency, which also considers theoretical discharge and power input.