Experimental results show that diverging section will recover a considerable part of energy,so it′s incorrect to consider that pressure recovery in diverging section can compensate for frictional pressure drop.

Research on the pre-stress friction loss regularity in single span pre-stress beam;

Experimental study on friction loss of prestress;

Simplified calculation of the friction loss and anti-friction loss of the prestressing tendon in concrete structures;

The pre-stressing frictional loss between the pre-stressed wire and the transfer apparatus is tested by the experimental study on six pre-stressing frictional loss of the fold-line pre-tension pre-stressed wire of different angle,5°,9°,13°,the main factors of frictional loss are analyzed experimentally,the method in the calculation of the frictional loss of the pre-stressed wire using.

The friction losses of double crank and connecting rod mechanism diesel engine(SL195) and single crank and connecting rod mechanism diesel engine (L195) are calculated by computer.

The calculation formulas of friction losses in prestressed ring concrete construction is raised by the theory as compared with experiment.

This paper presents a new method of reducing friction losses of disk by inserting another disk in-side the clearance between the disk and the closure cavity.