A new concept

compound damp drip for absorbing shock wave in oscillatory tube

is developed in the present paper.The main idea of the concept is that the shock wave absorber must has the two functions

that is

it can not only exhaust the energy of the incident shock wave fully but also transfer the energy out promptly.In the experiment

the compound damp drip is structured with a multi-orifice for intensifying the energy dissipation of the shock wave and an internal cooling system for strengthening the heat transfer.The experimental results show that a strong reflect shock wave

whose strength is 66%of the incident shock wave

is measured at the position of the relative tube length x/L =0.3 when the oscillatory tube without the compound damp drip.But

after the compound damp drip is amounted at the closed end of the tube

the reflect shock wave is eliminated effectively and the refrigerating efficiency η is increased by 4%～10% in case of the L/d ratio is 140 and the expansion ratio ε is changed from 2.0 to 6.0.What is more

the refrigerating efficiency in case of L/d =140 and the tube is mounted with the compound damp drip is still higher by 2%～6% than that the tube without damp drip but L/d =300.The above result means that while the damp drip is used

the refrigerating efficiency can be increased and the size of the refrigerator can be decreased significantly.