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借鉴顺逆式板翅式换热器研究成果,分析了交叉式多股流板翅式换热器传热机理,建立了基于有限容积法的多股流板翅式换热器传热数学模型,经过合理假设将翅片间距与单元格尺寸独立,拓展了前人数学模型适用范围.同时,以机载交叉式3股流板翅式换热器为例,对单元格尺寸选取进行了探讨,对同一通道单元格内流体流动横向传热进行了分析,证明了忽略流动横向传热的可行性,从而在保证精度不变条件下提高了计算效率;并在流体变入口参数条件下进行试验,对数值计算方法进行验证,通过与试验数据对比,理论计算误差小于7.9%,证明了数值计算方法的合理性.
Based on the research results of the reciprocating plate-fin heat exchanger, the heat transfer mechanism of the cross-manifold multi-flow plate-fin heat exchanger was analyzed and the heat transfer mathematical model of multi-flow plate-fin heat exchanger based on the finite volume method , Reasonable assumption is made to separate the fin pitch from the cell size, which expands the scope of the former mathematical model.At the same time, taking the on-board cross-flow 3-fin plate-fin heat exchanger as an example, , The transverse heat transfer in the same channel cell is analyzed and the feasibility of neglecting the transverse heat transfer in the cell is verified. The computational efficiency is improved under the condition of keeping the accuracy unchanged. The experiment is carried out under the fluid inlet parameter The numerical calculation method is verified. Compared with the experimental data, the theoretical calculation error is less than 7.9%, which proves the rationality of the numerical method.