Study On The Friction Resistant In The Hollow Stator Bar Of Evaporative Cooling Generator

The 400MW evaporative cooling hydro-generator in 1999 at Lijiaxia Power Station proves the security and reliability of evaporative cooling technique. Compared with the inner water-cooling generator designed by foreign country, it shows apparent advantages. In recent years, Three Gorge Corporation is going to substitute the inner water-cooling for evaporative cooling. Under the condition, it is instructive in researching on the flow and heat transfer character, which is the core technique of evaporative cooling generator, for the design theory and manufacture technology. This article mainly studies the friction resistant of liquid and gas two-phase flow in the hollow stator bar and the circulation theory with different unused coolant in descending pipe. The circulation method of vertical evaporative cooling generator is CLSC (close-loop-self-circulation). The article studied the cooling system circulation theory from the aspect of energy conservation, and testified by experimental data. The result is that 99% heat, which the coolant absorbs, is used to change its state, increasing the enthalpy. Enthalpy variety can be used to calculate the flow resistant and verify the result of condenser height design. It proves that circulation motivity is composed of two portions, one is the unused coolant in descending pipe, and the other is the circular coolant. When there is no unused coolant, it is the circular coolant which offered the motivation of circulation. It is a complementarity to vertical generator circulation theory. The article improved the liquid and gas two-phase compel flow experimental table and measure system with coolant F113, the influence of heat load, vapor quantity, flux and pressure on the friction resistant were studied. With M-N equation and L-M equation, magnifying multiple were calculated, and corrected by experimental data. The result shows that within the experimental flux (1.33g/s~4.69g/s) the optimal flux is from 1.33g/s to 3.34g/s. In the range, the error is within 10% with xe=0.1~0.8; out of the range, the error is within 10% with xe>0.3. The result can be used in technical application. For convenience of industry application, the figure of exit vapor quantity versus magnifying multiple with different flux...