Turbomachinery Workshop on Advances in Detonation Based Engines and Relevant Unsteady Turbomachinery Flows

On November 26th 2019, for the seventh consecutive year, a turbomachinery workshop organized by Assoc. Prof. Beni Cukurel was held at the Technion Aerospace Department. The training activities were geared towards creating a platform for world’s leading minds in the field of turbomachinery to come and share their knowledge with students, members of academia and industry.

This year we had the honor of hosting Prof. Guillermo Paniagua, Dr. Bayındır Saracoğlu and Dr. John Clark – experts in detonation-based cycles and
pressure gain combustion, modeling of constant volume combustion, and high-work low-pressure turbine design.

Prof. Guillermo Paniagua’s session included:

  • Detonation based cycles, difference between detonation and deflagration
  • Types of pressure gain combustion concepts
  • Rotating detonation based cycles for different applications:
    • Single shaft, turbojet
    • Power delivered to a shaft, turbo-shaft
  • Experimental work on detonation
  • Design, performance and optimization of supersonic axial turbines
  • How to retrofit existing gas turbines with rotating detonation combustors
  • Development of radial outflow turbines
  • Alternative turbine designs, such as bladeless turbines
  • Preliminary testing of the detonation with a turbine

Dr. Bayındır Saracoğlu’s topic covered aspects such as:

  • High-fidelity modeling of constant volume combustion
    • Conjugate heat-transfer modeling of detonation engines
      • Treatment of fluid-solid interface
      • Long duration operation of RDE
    • Effect of detonation waves on the compressor flows
      • Numerical simulations on the radial compressors subjected to periodic pressure fluctuations
  • Interaction of detonation waves with downstream components
    • Wave propagation through the nozzle guide vanes
  • Alternative considerations: Magneto-hydrodynamic (MHD) power extraction from detonation combustors
    • Principles of MHD power extraction
    • Governing equations and test setup
    • Benefits and limitation of MHD power extraction from detonation engines

Dr. John Clark presented on the topics of:

  • High lift / High work low pressure turbine design and the impact of unsteadiness, Part I – Turbine Aerodynamic Design Process
    • Iterative design loop: an example for a multi-stage, low pressure turbine
    • Meanline design to meet cycle requirements
    • 2D profile design
    • 3D stacking and steady Navier-Stokes analysis
    • Unsteady Navier-Stokes analysis
  • High lift / High work low pressure turbine design and the impact of unsteadiness, Part II – Important Flow Physics and Modeling
    • General observations: The Reynolds Lapse
    • Boundary-layer transition
    • Boundary-layer separation
    • Secondary flow
    • Unsteady interactions
  • High lift / High work low pressure turbine design and the impact of unsteadiness, Part III – Design Studies and Validation Experiments
    • Cascades:
      • L-series airfoils
      • Design for secondary flow management
      • Passive flow control
      • Compressible flows
    • Stages:
      • ND-HiLT01
      • Further design improvements

Members from branches of MAFAT, Israeli Air Force, Bet Shemesh Engines, Rafael, Israeli Aircraft Industries and Technion faculty/staff/students attended the event. Total registration included over 50 participants. We have received significant positive feedback from all those who attended the sessions.