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THERMOACOUSTICS

THERMOACOUSTICS. Optimisation of the Feedback Loop of the Thermoacoustic Travelling wave Engine. David Wee Shuon Tzern Yousif Abdalla Abakr David Hann Paul Riley. The Simplest form of a Travelling Wave Thermoacoustic Engine. Regenerator. Linear Alternator. Tuning Stub. Feed Back Loop.

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THERMOACOUSTICS

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  1. THERMOACOUSTICS Optimisation of the Feedback Loop of the Thermoacoustic Travelling wave Engine David Wee Shuon Tzern Yousif Abdalla Abakr David Hann Paul Riley

  2. The Simplest form of a Travelling Wave Thermoacoustic Engine Regenerator Linear Alternator Tuning Stub Feed Back Loop Limiting amplitude occurs when the amplification of the regenerator is equivalent to the power absorbed by the system Total Power Absorbed = Power absorbed by Linear Alternator + System Losses

  3. SCORE -StoveTM Thermoacoustic Engine REQUIREMENT Efficiency Compact INFLUENCING PARAMETER Elbow Bends An understanding of the Acoustic Transmission through bends is required in order to optimise the system

  4. MICROPHONE Decomposition Method Decomposition Transfer Function Scattering Matrix Technique

  5. MICROPHONE Experimental Setup Optimum Travelling wave Load

  6. MICROPHONE Experimental Setup Investigated Bends

  7. Reynolds Number vs. Transmission Loss [%] Legend r = hydraulic radius (m) R = radius of curvature of elbow(m) u = RMS particle velocity (ms-1) c = speed of sound (ms-1) ω = angular frequency (s-1) ρ = density (kg/m3) ν = kinematic viscousity (m2s-1) Legend r = hydraulic cross sectional radius (m) R = Radius of curvature of elbow(m) u = RMS particle velocity (ms-1) c = Speed of sound (ms-1) ω = angular frequency (s-1) ν = kinematic viscousity (m2s-1)

  8. Dean Number vs. Transmission Power Loss [%] Linear Loss Region Non-Linear Loss Region

  9. PIV Experimental Setup PIV=Particle Image Velocimetry

  10. PIV Experimental Setup

  11. PIV Experimental Setup

  12. Dean Number vs. Transmission Power Loss [%] Linear Loss Region Non-Linear Loss Region

  13. Dean Number vs. Transmission Power Loss [%] Linear Loss Region Non-Linear Loss Region At Higher operating Amplitude such as that of the Engine, Losses may go up to 10% or more

  14. CONCLUSIONS • A monotonic relationship has been found between the Percentage Acoustic Transmission Loss and the Acoustic Dean Number. A critical Dean Number (≈1) above which the transmission losses increase significantly has been identified. • Particle Image Velocimetry is being used to investigate the transition to nonlinearity by consideration of the flow field. • Once verified this would prove an important breakthrough in the design of future feedback resonator loop for thermoacoustic systems by providing new information about • the additional losses at the elbow bends.

  15. THANK YOU

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