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Dynamic analysis of free piston Stirling engines

Ulusoy, Necati
http://rave.ohiolink.edu/etdc/view?acc_num=case1061217408

Abstract Details

1994, Doctor of Philosophy, Case Western Reserve University, Mechanical Engineering.
The dynamics of a free piston Stirling engine is investigated through non-linear analysis and numerical simulations. The thermodynamics of the engine is coupled to the dynamics via either an isothermal or nonisothermal model. The influence of a nonlinear damper load, the nonlinear pressure loss across the heat exchangers and the nonlinear spring terms on the dynamics of the engine are examined. The nonlinear analysis of the isothermal model shows that both the nonlinear load and the nonlinear loss are sufficient to ensure a stable periodic motion of the piston and displacer and the amplitude of the piston and displacer displacements can be controlled using the coefficient of the nonlinear load term. While a nonlinear spring in general is capable of producing a limit cycle solution, the amplitude of the periodic motion is either too small or too sensitive to changes in the loading. All these analytical results are verified by numerical integration. The idea of the nonlinear load is examined further by coupling the dynamic model to an electrical model for a linear alternator. Analysis of a reduced order model reveals the existence of stable periodic solutions and numerical integrations of the full model are presented to verify the analysis. The amplitude of the piston and displacer motion can be controlled through the parameters associated with the electrical load. Finally, the effect of the temperature variation due to nonisothermal behavior of the working gas on the engine dynamics is investigated by numerical integration of the nonisothermal model. The results of these integrations show that the variation in the working gas temperature does not have a significant effect on the dynamics of the engine, therefore the isothermal assumption is appropriate for a qualitative dynamic analysis
Frances McCaughan (Advisor)
149 p.
Engineering, Mechanical
Free piston Stirling engine

Recommended Citations

Citations

  • Ulusoy, N. (1994). Dynamic analysis of free piston Stirling engines [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1061217408

    APA Style (7th edition)

  • Ulusoy, Necati. Dynamic analysis of free piston Stirling engines. 1994. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1061217408.

    MLA Style (8th edition)

  • Ulusoy, Necati. "Dynamic analysis of free piston Stirling engines." Doctoral dissertation, Case Western Reserve University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=case1061217408

    Chicago Manual of Style (17th edition)

case1061217408
3,718
© 1994, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.