Experimental research is made on compound heat transfer enhancement by combination of inlet axial vane swirlers with left spirally corrugated tube

right spirally corrugated tube and symmetrical cross spirally corrugated tube

respectively.The experimental results of the tube side friction and heat transfer are given

and the corresponding friction and heat transfer dimensionless correlations which reflect the in fluence of the compound attack angle are obtained.Moreover

the thermodynamical performance curves are presented to show that given the same pump power and heat transfer area

the heat transfer rate Q of the combination in the opposite spiral direction is always higher than that of the combination in the same spiral direction

and within the experimental range

the value of Q can be increased by 90%

compared to the smooth tube．