Research On The Frequency And Output Characteristics Of Regenerator With Different Structures

Regenerator is the key component of thermoacoustic conversion whose structure influences the operating characteristics of thermoacoustic system, such as onset temperature, pressure fluctuation, operation frequency, etc. At the present, the structure of the existing regenerator is relatively simplex and the researches on the output characteristic of regenerator are rare. Based on NSFC(51276201) and the previous researches, this paper puts forward to two new kinds of regenerator and researches their frequency characteristic and output characteristic.According to the fluid impedance method, this paper deduces frequency equation of thermoacoustic system and computes the frequency value of the first seven stages of the system. In addition, it designs1/4wavelength standing wave thermoacoustic engine by deploying DeltaEC software and calculates the distribution of the model’s pressure and volume flow rate as well.The experiment focuses on the basic operating characteristics including onset temperature, operating frequency, pressure amplitude of thermoacoustic engine system with honeycomb ceramic regenerator under the condition of different heating power of hot end. The experiment results indicate that:1. Onset temperature of the system decreases with the increase of heating power;2. When the heating power is98W or115W, the hot end temperature rise is stable in the process of start-up. When it is133W, there are drastic fluctuations in hot end temperature. The greater the heating power is, the higher the thermoacoustic system pressure amplitude is, and the longer the corresponding vibration time is;3. The experiment result is in accordance with the computing frequency. Thus it can be concluded that system operating frequency is irrelevant to heating power.The paper makes a comparison of thermoacoustic characteristics between fin-type regenerator and honeycomb ceramic regenerator. When the hot end heating power is133W, onset temperature of fin-type regenerator is slightly lower. Its pressure amplitude is fairly smaller than that of honeycomb ceramic regenerator in stable operation. Pressure wave declines instantly when vibration eliminates. And the operation frequency of these two kinds of regenerator is also different.The paper innovatively designs and employs drum mesh regenerator. The experiment data implies that the onset temperature of system is rather high; the onset process is stable; the operation frequency of the system and honeycomb ceramic regenerator is the same.Lastly, the paper researches the systemic output characteristic of thermoacoustic engine with honeycomb ceramic regenerator and fin-type regenerator by deploying piezoelectric ceramic piece, which measures the oscillation frequency of the output voltage fluctuation and piezoelectric.