喷嘴配气方式对CAES系统涡轮性能影响

Effect of Nozzle Governing Method on CAES System Turbine Performance

压缩空气储能系统在释能过程中储气压力逐渐降低,需要对涡轮采用合理的配气方式使涡轮高效运行。本文研究了额定流量工况下不同喷嘴配气方式对涡轮输出功和节流效率的影响。研究表明,对于相同调节喷嘴数,随着基准压力的降低,不同位置配气工况的做功能力逐渐趋于一致。基准压力一定时,输出功随着调节喷嘴数的增多而降低。对于不同工况,流场中的主要损失为节流阀引起的节流损失,因此在选择配气方式时,应尽量使节流损失降低,以提高系统的输出功。

The air storage pressure gradually reduces during the energy release process in compressed air energy storage system.It is necessary to be adopted an appropriate air distribution method for the turbine to maximize its performance.The impact of various nozzle governing modes on turbine output work and throttling efficiency at rated mass flow rate conditions are examined in this research.According to the study,for an equal number of regulating nozzles,the work capacities of various nozzle distribution positions gradually converge as the base pressure falls.The output work reduces as the number of regulated nozzles rises with a specific base pressure.When choosing a reasonable nozzle governing mode,the throttling losses should be decreased to increase the output work of the system because for different working conditions,the major losses in the flow field is the throttling losses caused by the throttle valve.