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以某双排对转轴流压气机为研究对象,通过区域缩放法开展非定常数值研究。数值结果显示近喘点附近转子2(R2)叶尖泄漏流动造成了高叶展范围内的流动阻塞以及高熵流动区域的产生,下游出口导流叶片承受着非常不利的来流条件。通过在转子叶尖近高熵流动核心区轮缘端壁处设置抽吸孔进行低能流体的移除能够明显改善叶尖区域的流场品质,提高压气机工作特性。根据数值研究结果,重新设计并加工了用于端壁抽吸的轮缘机匣,搭建了附面层抽吸系统及测控系统。在80%设计转速下,针对转子2叶尖进行端壁附面层抽吸,相对抽吸流量为1.0%。实验结果显示,端壁附面层抽吸应工作在低于原始特性最高效率点所在流量的小流量范围内。在此流量范围内端壁抽吸会大幅提高工作效率,改善压气机负荷水平。而在高于此流量的范围内,端壁附面层抽吸会带来负面影响。
Taking a double-row rotary-flow compressor as the research object, the unsteady numerical study is carried out by the region scaling method. The numerical results show that the tip leakage flow near the rotor 2 (R2) near the near-asthma point caused the clogging of the flow in the high leaf span and the generation of the high-entropy flow region. The downstream outlet guide vane underwent very unfavorable flow conditions. The removal of low-energy fluid by installing suction holes in the end wall of the rim of the core near the high-entropy flow in the tip of the rotor can obviously improve the flow field quality in the tip region and improve the operating characteristics of the compressor. According to the numerical results, the rim casing for the suction of the end wall was redesigned and processed, and the surface suction system and the monitoring and control system were set up. At the design speed of 80%, the tip wall was suctioned against the tip of the rotor 2 with a relative aspiration flow of 1.0%. The experimental results show that the suction on the end wall should be within the low flow range where the maximum efficiency of the original characteristics is low. Pumping at the end wall within this range of flow rates significantly increases operating efficiency and improves compressor load levels. Above this range of flow rates, the suction of the overburden on the end wall can have a negative effect.