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In this paper, a 300Hz pulse tube cryocooler (PTC) driven by a double-acting thermoacoustic heat engine (DATHE) has been studied. A double-acting thermoacoustic heat engine incorporates several travelling-wave heat engine units, which are serially connected in a loop. Compared with the conventional thermoacoustic heat engine which involves a travelling-wave loop and a resonator, it has advantages of compact size and potentially high thermal efficiency. In this paper, a DATHE-PTC system was designed, optimized and studied in detail. Firstly, numerical simulation was conducted to design the system and optimum structure parameters of the system were obtained. With the operating condition of 4MPa mean pressure and 300Hz working frequency, a cooling power of 7.75W at 77K and a relative Carnot efficiency of 11.75% were achieved. In order to better understand the energy conversion characteristics of the system, distributions of key parameters such as acoustic work, phase difference were presented and discussed. Then, the coupling mechanism of the system was investigated. In addition, the influence of mean pressure on the system performance was studied

Numerical Investigation on a 300Hz Pulse Tube Cryocooler Driven by a Double-acting Thermoacoustic Heat Engine