Research On Flow Characteristics In Geothermal Power System

In order to reduce atmosphere pollution and energy dissipation,it is an pressing task for sustainable development to exploit clean regenerative resources. The purpose of this thesis based on recycling geothermal heat source and studied the geothermal power system.Freon (R11) was selected as cycle fluid, Organic Rankine cyclic system as geothermal power system was identified and introduced. On this basis, thermodynamics and fluid mechanics as main theory were used to calculate the operation parameters of system main generator model, the result was showed the relationship between operation parameters with flow.Phase change flow field of Circular emphasizes in evaporator is simulated in this thesis. Two-dimensional axisymmetric VOF model was used to simulate the static physical process of the fluid inside the evaporator. This thesis based on CFD to carry on secondary development of calculated on commercial software FLUENT. Through the user-Defined functions UDF embedded simulated the evaporation physical process of fluid (R11) in the evaporator. Model comprehensively considers the condition of the evaporator in phase transition and flowing heat, tracking gas-liquid interface position. The temperature field, velocity field and pressure field and changing curves of liquid volume fraction was found in the system with different temperatures. The calculated results have been found useful to the evaporator design. Numerical results show that evaporator was in ribbon evaporation state at certain temperature, Temperature field, liquid volume fraction field and density field have a clear dividing line face to separate liquid area, two phase region and steam dome.Experiment research is operated about the geothermal power system, the main components of a cyclic system was introduced. The result shows that relationship of generating power and pressure difference btween the inlet and outlet of turbine.