02-09-2017, 11:30 AM
Compared to traditional motors, thermo-acoustic motors are relatively new and can act as linear compressors for refrigerators. Many institutes have shown great interest in this type of machine because of its absence of moving mechanical parts. In this work, the influence of the dimensions of the main parts of Stirling's small-scale thermo-acoustic motor was simulated numerically using a computer code called DeltaEC. It was found that the resonator and resonator cavity were the most convenient and effective for improving engine performance. Based on the numerical simulation, a small-scale Stirling thermo-acoustic motor was built and experimentally investigated. At present, with a resonator length of only 1 m, the working frequency of the motor was reduced to 90 Hz and the starting temperature difference was reduced to 198.2 K.
A modified SIMPLEC method is introduced that can solve compressible flows at low Mach numbers and is used to study thermoacoustic waves induced by a rapid temperature change in a solid wall and alternating direction flows generated by thermoacoustic effects in a conical resonator. The results indicate that the algorithm adopted in this document can be used to calculate compressible flows and thermoacoustic waves. It is found that the pressure and velocity in the resonator behave like standing waves, and the conical resonator can suppress high-frequency harmonic waves as seen in a cylindrical resonator.
A modified SIMPLEC method is introduced that can solve compressible flows at low Mach numbers and is used to study thermoacoustic waves induced by a rapid temperature change in a solid wall and alternating direction flows generated by thermoacoustic effects in a conical resonator. The results indicate that the algorithm adopted in this document can be used to calculate compressible flows and thermoacoustic waves. It is found that the pressure and velocity in the resonator behave like standing waves, and the conical resonator can suppress high-frequency harmonic waves as seen in a cylindrical resonator.