The effect of inertia terms ( especially centrifugal terms ) on the leakage flow through the narrow clearance between the rotor and side plates of a sliding vane rotary compressor is investigated, and it is pointed out that the flow model without inertia terms can be sufficiently accurate in our situation. Then, our problem is solved by Finite Element Method under the non-axisymmetric boundary ...

The application of oil-free-integrated motor-compressors has become increasingly popular in recent years. One of the significant features of this class of machinery is compactness, providing space-savings compared to traditional-oil-lubricated compressors with associated gearboxes and lubrication systems. The integration of a turbo separator with such a compressor has resulted in the creation o...

In this chapter a general introduction of centrifugal compression systems is presented. The unstable surge phenomenon in compressors is discussed, as well as possible means to avoid or suppress this instability. From an assessment of the current state of the art in control-oriented modeling and identification, the research objectives are formulated. 1.1 General introduction The general topic of...

The centrifugal compressor is the core component of supercritical CO2 power cycle, and its performance operation stability are research hotspots. However, there few experimental studies, especially for compressors used in Mwe-scale cycles. In this paper, based on a 1 MWe single-stage designed with speed 40,000 RPM, pressure ratio 2.5 mass flow 16.3 kg/s. order to carry out test, general platfor...

A novel aproach to active surge control is presented for a centrifugal compressor driven by an electrical motor. The main idea of the paper is to use the drive itself for surge control. This eliminates the need for additional actuators, and has the potential of energy efficient operation. It is shown that previous unstable operating points to the left of the surge line can be made globally expo...

This paper presents a steady-state model that is useful for predicting the performance of centrifugal liquid chillers over a wide range of operating conditions. The model employs an elemental NTU-E methodology to model both the shell-and-tube condenser and the flooded evaporator. The approach allows the change in heat transfer coefficients throughout the heat exchangers to be accounted for, the...

For over 15 years now, the efficiency and reliability of centrifugal compressors have been enhanced by the application of thermoplastic materials to the eye, shaft, and balance piston labyrinth seals. Traditionally these seals have been manufactured from metallic materials and have required relatively large clearances for reliability reasons. By upgrading to carefully selected engineered thermo...