Numerical research on high temperature stress characteristic of internally finned bayonet tube

In the present paper, the high temperature stress characteristic of internally finned bayonet tube is numerically studied. The results indicate that high temperature is the main factor to cause large stress and deformation. The large stress happens in the joint of inner fins and inner tubes, so the welding quality of the joint must be ensured. Due to the significant potential of reducing thermal stress, the bayonet structure is superior to the traditional tube for use in the high temperature heat exchanger. Furthermore, it is more suitable for use in the high pressure environment than primary surface recuperator.