中文摘要：

基于一次表面回热器（PSR）通道的独特构型,提出可以引入增强因子fξ和fk的概念来直观描述PSR通道的复杂流动和传热特点。对典型50 kW微型燃机20∶1 PSR缩比实验件的流动和传热特性进行了测定。根据这种先进热交换器固有的结构和流动特点——冷、热通道的湿边周长lc=lh,冷、热通道的质量流量Gc≈Gh以及流动Reh≈Rec,获得层流下PSR的fξ和fk随流动Re变化的经验计算式。联立增强因子fξ和fk以及已有的小当量直径de≈1 mm通道层流阻力和换热关系式,可以方便地计算PSR的流动和对流换热规律,进而获得PSR的传热系数k,最后快捷完成新型间壁式PSR的热设计分析工作。

英文摘要：

In view of the particular flow path configuration of primaly surface recuperators （PSR）, the introduction of an enhancement factors fξ and fk are proposed, to take care of the PSR＇ s complex flow conditions and its heat transfer characteristics. Flow and heat transfer characteristics, of a typical 50 kW micro gas turbine＇ s PSR, have been studied with a 20 ： 1 scaled down experimental set. According to the spacial structural particularities of this kind of advanced heat exchanger, the wetted circunferential length of the heat and cold flow paths are, lc = lh , the respective mass flow Gc ≈Gh and R ec ≈ Rcc .Empirical formulas for fξ and fk varying with Re, under PSR laminer flow comditions has been obtained. With the coupled enhancement factors fξ and fk and the functional relationship between laminer flow resistance and heat exchange, of flow ducts with small equivalent diameters de ≈ 1 mm, the flow and heat exchange behavior of PSR can be calculated wirh ease, and the heat transfer coefficient of the pertaining PSR obtained. Herewith only little time is needed for accomplishing thermal design and analysis of new type PSRs.