Two-dimensional numerical model of flow and heat transfer for stirling engine components.

摘要

A two-dimensional model has been developed to simulate the flow and heat transfer in Stirling engine components by using commercial code CFD-ACE.; The CFD-ACE code was utilized and showed excellent agreement with the published computational and experimental data in the areas such as: (1) Unidirectional turbulent pipe flow (experimental and computational data), (2) Unidirectional jet impingement flow and heat transfer, (3) gas spring, piston-cylinder oscillatory flow and heat transfer with moving boundary, (4) 2D MIT test rig, heat exchanger/piston-cylinder model, oscillatory flow and heat transfer, moving boundary and (5) flow through porous media, all show good agreements. The computational experiments examined for these areas provided the foundation for building the 2D complete engine model.; A 2D CSU Stirling Engine model was developed as the first step of the multi-dimension Stirling engine model development. Two models were examined, one without the wall and another model with the wall around engine. The model with wall represents a unique unsteady conjugate heat transfer problem particularly in the regenerator area. The geometry was kept similar to an STC real engine. No experimental data are available for the comparison. However, the PV power in compression space, expansion space, heat input and output, etc. were obtained from the 2D models and were compared with the 1D Sage model. The main similarities and differences were examined and discussed on the light of future multi-dimensional engine modeling.