Effect of the Speed on Blast Loss and Performance of Reversible Turbine
In order to study the reverse blast loss influencing factors of the turbine and master the control strategy and control method of reverse blast loss of reversible power turbine,a calculation model was es-tablished by taking a marine reversible power turbine as an example.Under the working condition of 1.0,based on the rated speed n of ahead turbine,the blast losses caused by the reversible power turbine at the speeds of 0.6n,0.8n,1.0n and 1.1n were calculated respectively,and the performance of the reversi-ble power turbine and the change of the blast loss at four speeds were compared and analyzed.At the same time,the internal flow field of the reversible turbine with different rotating directions was compared and the influence of the blast loss on the flow field parameters was analyzed.The research shows that when the unit is running ahead,the reversible turbine will produce blast loss,resulting in abnormal flow field parameters in the astern stage;when the outlet pressure is higher than the inlet pressure,the temper-ature rise of the moving cascade and the output power are negative;at 1.1n speed,the loss caused by blast is the highest,and the proportion of power loss is also the highest;the efficiency under 1.0n speed condi-tion is 0.02%lower than that under 1.1n speed condition,but the output power of the unit is highest.
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