CAJ | 학술논문

介绍了一次表面的发展及目前国内外研究的状况,采用单吹瞬变法对自行设计的3种CC(Cross Corrugated)型一次表面进行传热与阻力特性的试验研究.建立了数学模型,由数值解求得流体的出口温度与时间及传热单元数NTU间的函数关系.通过配比,获得了换热表面在测定工况下的NTU值.首次获得该3种CC表面的j和f的试验关联式.j因子和f因子均随Re的增加而逐渐下降,符合紧凑表面传热性能和阻力性能的一般规律.经误差分析,所提供的试验关联式的拟合误差不大于15%,具有足够的工程精度.关联式的使用条件是Re=120～800,换热面当量直径为1.2～1.4 mm,交错角45～75°.采用综合评价因子j/f对3种表面的性能进行了分析,结果表明,宽高比较大的型面具有较佳的综合性能.所得数据还与国内外其他学者的数值模拟结果进行了比较,试验数据与数值模拟的结果基本符合.
개소료일차표면적발전급목전국내외연구적상황,채용단취순변법대자행설계적3충CC(Cross Corrugated)형일차표면진행전열여조력특성적시험연구.건립료수학모형,유수치해구득류체적출구온도여시간급전열단원수NTU간적함수관계.통과배비,획득료환열표면재측정공황하적NTU치.수차획득해3충CC표면적j화f적시험관련식.j인자화f인자균수Re적증가이축점하강,부합긴주표면전열성능화조력성능적일반규률.경오차분석,소제공적시험관련식적의합오차불대우15%,구유족구적공정정도.관련식적사용조건시Re=120～800,환열면당량직경위1.2～1.4 mm,교착각45～75°.채용종합평개인자j/f대3충표면적성능진행료분석,결과표명,관고비교대적형면구유교가적종합성능.소득수거환여국내외기타학자적수치모의결과진행료비교,시험수거여수치모의적결과기본부합.
Described were the development of primary surface heat transfer and the current status of its research both at home and broad.By adopting a single-blow transient method,the heat transfer and flow resistance characteristics of three kinds of CC (cross corrugated) type primary surfaces were experimentally studied.A mathematical model was established,and the functional relationship among the fluid outlet temperature,time and NTU (number of transfer units),obtained from numerical solutions.Through a proportioned matching,the NTU value of the heat exchange surface under the relevant measurement conditions was determined with the test correlation of j and f for the three kinds of CC surface being obtained for the first time.Both j and f factor decrease gradually with an increase of Re number,conforming with the general law featuring the heat transfer and flow resistance performance of compact surfaces.After an error analysis,the fit error obtained from the test correlation being provided was assessed as not greater th an 15%,offering sufficient engineering precision.The conditions for using the correlation are given as follows:Re=120～800,the equivalent diameter of the heat exchange surface equals to 1.2～1.4 mm and the staggered angle ranges from 45 degrees to 75 degrees.By using the comprehensive evaluation factor of j/f,t he performance of the three kinds of surface was analyzed.The research results show that the profile with a comparatively great width/height ratio can secure a relatively good comprehensive performance.The data thus obtained were also compa red with the numerical simulation results of other academics both at home and abroad.The test data are basically in agreement with the numerical simulation results.