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Sensitivity Analysis of the Output Torque from a Microturbine Rotor (Compressed Air-Driven) to Design Parameters

Javaheri, Nima | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58806 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Javadi, Khodayar
  7. Abstract:
  8. In recent decades, due to the need for higher efficiency, reduced size and weight, and improved reliability, the development of non-combustion microturbines powered by compressed air has gained significant importance. Owing to their simple design, low weight, and high efficiency, these systems have found wide applications in precision industrial and medical instruments. One of the critical issues in designing such turbines is the sensitivity analysis of the rotor output torque with respect to design parameters, since small variations in geometry and flow conditions can lead to significant changes in performance. Accordingly, in the present study, the effects of three key parameters, including the clearance between the rotor and the turbine wall, the number of rotor blades, and the number of inlet nozzles on the output torque of a non-combustion microturbine have been investigated. To this end, the governing equations of the flow were first presented, and then, considering modeling assumptions and the computational framework, simulations were performed using a numerical method. In this process, the Standard k–ω turbulence model was employed, and the discretization of key quantities such as pressure and velocity was carried out to ensure sufficient accuracy and stability of the numerical results. The results revealed that the clearance between the rotor and the turbine wall has a considerable effect on the output torque, and excessive increase of this gap leads to a noticeable decline in performance. Moreover, the number of blades was found to be effective within an optimal range, while excessive increase caused reduced efficiency due to higher flow losses. In addition, the number of inlet nozzles played an important role in providing flow uniformity, directly influencing the generated torque. Overall, the findings of this research demonstrate that sensitivity analysis can serve as an effective tool in the optimization process of non-combustion microturbine design. Identifying the influential parameters and their impact on the output torque can provide valuable guidance for future designs, leading to enhanced efficiency, reduced losses, and improved performance of these systems in industrial and medical applications
  9. Keywords:
  10. Microturbine ; High Speed Microspindle ; Computational Fluid Dynamics (CFD) ; Torque ; Sensitivity Measurement

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