CHARACTERISTICS OF PRESSURE PULSATIONS IN PIPING SYSTEMS EXCITED BY A CENTRIFUGAL COMPRESSOR

To establish the practical evaluation method of the pressure pulsations excited by a centrifugal compressor or fan at blade passing frequency, a one-dimensional excitation source model for a compressor was proposed based on the equation of motion. The damping characteristics of the compressor were investigated experimentally and as a result, the resistance coefficient of the compressor depends on the Reynolds number defined by the equivalent velocity of the pulsating flow is introduced. It is also shown that the relation of the maximum pressure amplitude in piping systems to the location of the excitation source under resonant conditions can be evaluated by introducing the equivalent resistance of the compressor and that of piping systems.