Effect of end-clearance sealed structure of guide vane on variable nozzle turbine performance
Based on the traditional variable nozzle turbine guide vane,an end-clearance sealed guide vane(ESGV)was designed.The effect of ESGV on the performance of the turbine was analyzed by numerical simulation under different guide openings.The results showed that ESGV can effectively suppress the end-wall clearance leakage flow of the guide vane and improve the flow state of nozzle ring and rotor channel,and then enhance the turbine efficiency.Finally,the turbine performance tests of the ESGV turbine and the prototype turbine were carried out.The results showed that,when the flow characteristic curves of the two turbines were roughly the same,the efficiency of the ESGV turbine was 5％higher than that of the prototype turbine at the medium opening.
end-clearance sealed guide vane(ESGV)variable nozzle turbineclearance leakage flowturbine performanceleakage loss
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