基于CFD技术的暖风芯体结构设计与优化分析

某在研改款商用车空调箱暖风芯体单体换热性能较差,根据对标件初步优化后发现其换热性能更差,因此进行CFD定性仿真分析。通过流体分析研究发现基础模型芯体内部各扁管流量分配不均,初步优化后扁管流量分配更加不均匀,极大地降低了其换热性能,与试验反馈结果一致。根据流场仿真结果对其水室结构逐步优化,使得扁管流量分配比例的标准差值各工况下均提升了44%以上且芯体内流阻降低了约一倍。最终通过试验验证,单芯体的换热性能提高了3%-8%,满足了设计要求。

Structural Design and Optimization Analysis of Heating Core Based on CFD Technology

The heat transfer performance of a commercial vehicle air conditioning unit is poor.According to the preliminary optimization of the standard parts,it is found that the heat transfer performance is worse,so the CFD qualitative simulation analysis is carried out.Through the CFD analysis and research,it is found that the internal flow distribution in the flat tube of the basic model is uneven,and the internal flow rate is more uneven after the preliminary optimization,which greatly reduces the heat transfer performance,which is consistent with the feedback of the test results.According to the simulation results of flow field,the structure of the water chamber is gradually optimized.The standard deviation of the flow distribution ratio of the flat tube is increased by more than 44%under various conditions,and the flow resistance in the core is reduced by about one time.Finally,the test results show that the heat transfer performance of the single core is improved by 3%-8%,which meets the design requirements.