Ultra-low pressure steam waste heat recovery turbine is a new type of steam recovery device that can achieve efficient recovery of ultra-low pressure steam waste heat.The internal flow characteristics within the turbine is relatively complex during variable operating conditions,and the vibration induced by complex flow can seriously endanger the safe operation of the whole unit.This paper analyzes the steady-state flow field characteristics and pressure pulsation characteristics of the steam turbine under different inlet flow rates.The research conclusion shows that when the inlet steam flow rate decreases,backflow occurs from the root of the last stage moving blade near the outlet,and the backflow expands from this blade root towards the blade tip and the second last stage.Under low flow conditions,vortex which will induce vibration occurs at the clearance between the moving and stationary blades at the top of the last stage blade,resulting in wideband pressure pulsation at the blade tip.
关键词
超低压蒸汽透平/内部流动/动静间隙涡/压力脉动
Key words
ultra-low pressure steam waste heat recovery turbine/internal flow/vortex in the dynamic and static clearance/pressure pulsation
维普
万方数据