Where can leakage in a screw compressor occur and how can it be partly eliminated?

Leakage in a screw compressor can occur at various points, primarily between the rotors and the rotor housing. This is significant because leakage in these areas can lead to a reduction in efficiency and overall performance of the compressor.

Injecting oil in the gap between the rotor and the housing acts as a sealing medium, helping to fill any spaces where air or gas might escape, which minimizes leakage. This not only enhances the efficiency but also may provide lubrication, reducing wear and tear on the components.

Increasing the rpm can also impact leakage. When the speed of the rotors is increased, the dynamics of the airflow and the pressure differential in the compressor change. At higher rpm, the inertia can help maintain a continuous flow of air or gas, which can contribute to reduced leakage incidents.

By recognizing that both the injection of oil and increasing the rotor speed can contribute to managing leakage within a screw compressor, you see why both these options are part of the correct answer. This understanding underscores the necessity of proper management of both compressor speed and lubrication to maintain optimal performance in screw compressors.