Abstract
Keywords: Modelling, Experiment, Heat Transfer, Dry Screw Compressor, Water Injection
Mathematical modelling is used extensively as a basis for calculation of screw machine performance. The simplest, quasi one dimensional model is used for everyday design calculations. More complex models are used to estimate effects of specific machine aspects, for example a 2-D CFD is used for calculation of leakage flows. The most complex 3-D CFD calculations are used for detailed evaluation of flow characteristics within a machine flow domains. Complexity of measurements follows the complexity of mathematical modelling. The basic production tests are compulsory for all machines and as such may be suitable for validation of basic mathematical models. Measurements that give more insight into the machine process are more complex and demand higher quality instrumentation with better accuracy and dynamic response. The most complex measurements, for example flow and pressure measurement within the compression chamber, are performed to validate the most complex mathematical models in particular to verify CFD codes. Research in extension of operating range of automotive superchargers is presented here as successful example of simultaneous modeling and measurement.