The affinity law of a pump establishes relationships between pump performance parameters (flow rate, head, power) when operating under different conditions. It states that for a geometrically similar pump, flow rate is proportional to the impeller speed, head is proportional to the square of the impeller speed, and power is proportional to the cube of the impeller speed. By understanding these relationships, engineers can predict pump behavior under varying operating conditions, enabling efficient system design and operation.
