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以实验室对转压气机为研究对象,采用数值模拟方法研究了不同转速比对压气机稳定性的影响。着重分析了转速比对压气机失速边界和堵塞边界的影响规律,并对不同转速比下各转子的稳定性进行了初步的研究。结果表明:(1)当转速比R2:R1>1.0时,转速比增大会导致失速边界和堵塞边界均向小流量方向偏移。(2)当转速比R2:R1<1.0时,随转速比增大失速边界变化不大,但堵塞边界向大流量方向偏移。(3)转子1转速变化对转子2气动性能具有很大的影响,而转子2转速变化却对转子1性能影响不大。(4)在不同转速比下,导致该对转压气机失稳的主要因素也不同。
Taking the laboratory compressor as the research object, the numerical simulation method was used to study the influence of different speed ratios on the compressor stability. The influences of speed ratio on the stall boundary and blockage boundary of the compressor are emphatically analyzed. The stability of each rotor at different speed ratios is also studied. The results show that: (1) When the speed ratio R2: R1> 1.0, the speed ratio will increase, causing the stall boundary and the blocking boundary to deviate to the small flow direction. (2) When the speed ratio R2: R1 <1.0, the boundary of stall does not change much with the increase of speed ratio, but the blockage boundary shifts to the direction of large flow. (3) The change of rotor speed has a great influence on the aerodynamic performance of rotor 2, while the change of rotor 2 speed has little effect on rotor 1 performance. (4) Under different speed ratios, the main factors that lead to the instability of the compressor are also different.