Abstract
A helical screw expander, is a rotary positive displacement machine, is expected to adapt a small sized energy conversion machine from the waste heat or a total flow expander for the geothermal resources. So far, fundamental performance of the helical screw expander had been studied experimentalluy. But, more detail data with wide operating conditions are need to estimate the performance of the helical screw expander. In this work, we developed the simulation program, which included leakage losses and dynamic losses of the flow past through the inlet or the discharge port. Furthermore, the unsymmetrical rotor profile, which had been used in the experimental studies, is used in this performance analysis method. Simulation results are agreed with the experimental results, especially at the low speed region. Then this simulation method is applicable to evaluate the performance of a helical screw expander.
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