A 70th birthday tribute to Academician Ruixian Cai

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  • Academician Cai, an Associate Editor of Energy, studied in Tsinghua University, the Beijing

    Institute of Aeronautics (now, BUAA), and Jiaotong University, and graduated from Jiaotong

    Works, and a faculty position at the Institute of Mechanics, Chinese Academy of Sciences.

    From 1980, he was Research Associate Professor, Research Professor, Vice Director and then

    Director of the Institute of Engineering Thermophysics, Chinese Academy of Sciences.

    of Engineerin Natural Scien

    also a member of the executive committee and representative of C

    ciety for Air Turbomachinional Gas Tur Chinese SocieDepartment

    China. He is

    national So

    the Internat0360-5442/$ - see front matter# 20doi:10.1016/j.energy.2004.08.028Breathing Engines, member of the

    bine Institute, the president of the04 Published by Elsevier Ltdce Foundation of

    hina of the Inter-

    ery Committee of

    ty of Engineeringg and Materials Sciences, NationalAcademician, Chinese Academy of Sciences, and from 1994 till 2002, he served as Director,Academician Cai is a top Chinese scientist in the eld of power engineering. With experienceand great success in academia, industry, and research institutes, he was appointed in 1991 asUniversity in 1956. His early career included a faculty position in the Power Engineering

    Department of Tsinghua University, six years engineering experience in Changchun LocomotiveEnergy 30 (2005) 13



    A 70th birthday tribute to Academician Ruixian Cai

  • Editorial / Energy 30 (2005) 132Thermophysics, member of the Scientic Committee of the ECOS series of international confer-ences, and standing member of some other professional societies in China.He has guided many students and won the excellent teacher award many times, and four of

    his former students have become Academicians of China.Just after his graduation in the 1950s, he was honored to be chosen as the rst assistant of

    Academician Wu, a founder of 3D turbomachinery ow theory in the world, in Tsinghua Uni-versity. He made signicant advancements in Wus theory, primarily in the following areas.(1) He developed the mean streamline method, which was, in the 1950s and 1960s, the onlymethod for the eective calculation of compressible cascade ow without a computer; heimproved the calculation speed and precision of this method by an order of magnitude, andexpanded its usable range from subsonic to low transonic ow and from turbine cascade toother ow channels. These achievements have been quoted by international textbooks and otherpublications. (2) He found a constraint condition on the turbomachinery circular wall whichhad not been included in Wus original 3D turbomachinery ow theory.When he worked in industry in the 1970s, as the only gas turbine expert in the factory, he

    took part in successfully designing and manufacturing a 4500 hp gas turbine locomotive proto-type without any foreign help. He discovered an eect of the inner shroud of axial compressorson its performance, especially its surge limit. Some other axial compressors made in China wereimproved later with the understanding of this eect, which is still being studied around theworld.Academician Cai has been engaged in the basic study of counter-rotating turbines since the

    late 1980s. He developed a basic analysis of such turbines that is the most comprehensive one inthe open literature, and has been referred to by Chinese military jet engine researchers.From the 1980s, he has taken part in the study of complex thermal cycles. There have been

    three main achievements in this eld. (1) Proposing a comparison method to easily analyze andpresent the performance of various complex cycles. With this method, he was the rst (publishedin 1981, in Chinese) to prove that the optimal pressure ratio for eciency of combined cycles isapproximately equal to the optimal pressure ratio for the specic output of simple cycle gas tur-bines. (2) Pointing out the irrationality of many widely used evaluation criteria in cycle analyses,and developing correct criteria and new analysis results. For example, he has shown that the eec-tiveness of recuperators has to be replaced by the average heat transfer temperature dierence.(3) Proposing some new cycles, for example, a novel hydrogen and oxygen combined cycle whicheliminates the heat transfer process from the topping to the bottoming cycle in the conventionalcombined cycle.Recently, he has been deriving many new algebraically explicit analytical solutions for the

    governing equations of ow and heat transfer etc. Most of the governing equations are non-linear, and analytical solutions for them have not been found before, for example, the governingequations of unsteady compressible ow and nonlinear heat transfer. Besides having theoreticalsignicance, analytical solutions can also serve as benchmarks for computational uid dynamicsand computational heat transfer; many papers on such analytical solutions have been publishedin major international journals.He is still active in scientic research, and advises many graduate students.We all convey to Academician Cai our congratulations on his birthday, and our most cordialwishes for his good health and continuing productive work and life.

  • Hongguang JinE-mail address: HGJIN@mail.etp.ac.cn


    Olav BollandChristos A. FrangopoulosRichard A. GaggioliZengyuan GuoBen HuaMasaru IshidaHongde JiangHongguang Jin (Editor)Rumou LinZonghu Lin

    Noam LiorMichael J. MoranRicardo RiveroGeorge TsatsaronisAntonio ValeroMichael R. von SpakovskyJianzhong XuJinyue YanShizheng ZhangYuan Zhou

    3Editorial / Energy 30 (2005) 13