Power Generation Technology ›› 2019, Vol. 40 ›› Issue (3): 230-238.DOI: 10.12096/j.2096-4528.pgt.19014

• Energy Clean and Efficient Utilization in Coal-fired Power Systems • Previous Articles     Next Articles

Design and Performance Analysis of Blade Disc Turbine in Low-grade Heat Source ORC System

Xi CHEN(),Yanping ZHANG*()   

  • Received:2019-01-29 Published:2019-06-30 Online:2019-07-02
  • Contact: Yanping ZHANG
  • Supported by:
    the National Basic Research Program of China(2015CB251504)

Abstract:

Tesla disc turbine is a kind of unconventional turbine utilizing viscous force in the boundary layer to drive the rotor. Due to the simple structure and low cost as well as the good adaptability to the working fluids, Tesla disc turbine is especially adaptable to the low-grade heat source recovery system. But the unique working principle results in the low operation torque and low efficiency comparing with the common forms of turbines, thus the commercial application of disc turbine is limited. The blades were added between adjacent discs and a mathematcial model for the new turbine structure was formulated. Computational fluid dynamics (CFD) verified that the present mathematical model could calculate the velocity and pressure distribution of the working fluid in the flow field and could predict the efficiency variation trend under different working conditions. Utilizing the present mathematical model, calculations and comparisons were made aiming at low-grade heat recovery organic rankine cycle (ORC) system using different working fluids. The results show that, with different working fluids, adding blades between discs in Tesla disc turbine could significantly improve the operation torque and turbine efficiency.

Key words: power generation, waste heat recovery, disc turbine, mathematical model, computational fluid dynamics (CFD), organic rankine cycle (ORC)