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A Theoretical Dynamic Analysis of a regenerative heat exchanger Assembly in a Fluctuating Flow Regime

Journal of Mechanics Engineering and Automation 2014年第12期4卷 937-944页

作者： Franck Mulumba Senda Robert Thomas Dobson Mechanical Engineering Services the South African Nuclear Energy Corporation Pelindaba 0240 South Africa Mechanical and Mechatronics Engineering Stellenbosch University Stellenbosch 7602 South Africa

A fluctuating flow was used to investigate the thermo-fluid characteristic of a regenerative heat exchanger assembly designed, modelled, built and constructed for the used in Stifling engines applications. Vibration of the regenerative heat exchanger assembly was a problem to deal with during the experimental investigation. Hence, a dynamic analysis of the regenerative heat exchanger assembly was undertaken. The main sources of excitation in vibrations of the regenerative heat exchanger assembly were investigated and calculated based initially on the empirical correlations provided in the literature. Thereafter, a mathematical model of the regenerative heat exchanger assembly was developed based on the energy equations for each moving part of the assembly. The kinetic and potential energy equations were formulated for each moving part of the regenerative heat exchanger assembly. From the kinetic and potential equations, the Lag, range operator was defined, and then the Lagrange formulations were used to derive the differential equations representing the dynamic behavior of each moving part of the assembly. The differential equations were integrated to determine the system natural frequencies. These were then compared to the frequency on excitation in vibrations in order to predict the regenerative heat exchanger working conditions despite the existence of vibration in the system.

关键词： regenerative heat exchanger vibrations natural frequencies dynamic behavior Stirling engines.

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