چكيده به لاتين
The lack of energy resources,environmental pollution caused by fossil fuels, the rising demand for energy in the word market and the increasing demand for energy consumtion has led the studies to explore the other sourses of energy, one of this energy sources is high pressure fluid that their compressive energy can be retrieved and generate energy by help of turbines. currently screw expander are highly employed, but the need to optimize their efficiency will still be felt. in this study, a sample of twin screw expander with 3/5 configuration in gt-suite software simulated then in order to validate the model , the result of the simulated model were compared with experimental results,in order to optimize parameters using the DOE technique for optimum selection of clearances, we first defined 4-dimentional space of clearances variation. by combining the simulated model with subrogation model, the twin screw expander were optimized.in order to achieve this goal, the sample matrix consisting 25 clearance sample was composed of 25 parameters as input variable and the power for each of samples was calculated using the simulated model, then using the kriging, an alternative model was defined. so with the help of this model ,sensivity analysis was performed and a new optimized combine clearance for screw expander was presented, the power result of model show that model have good agreement with experimental data (below 6% deviation) and optimization has led to a significant increase in power through out different speed.in order to doing better study, the two clearances with maximum power effect(high pressure and radial clearances), The effect of their size on the pressure level of the chamber was investigated and the results show that Radial clearance has more distractive effect on chamber pressure.
