Study on Initial Unbalance Control of Rotor for Aero-engine Gas Generator
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摘要: 本文介绍了一种典型涡轴发动机燃气发生器转子结构，针对该转子存在的初始不平衡量分散度大的问题，分析了初始不平衡量的影响因素，计算了装配引起或单件初始不平衡量对转子振动的影响，发现压气机一级轴流盘和燃气涡轮二级盘的单件不平衡量对转子振动影响最大，必须降低这两个零件的初始不平衡量，但燃气发生器转子的平衡位置也在这两个零件上，这与降低单件不平衡量是相冲突的。为此，进一步分析了转子初始不平衡量的装配因素，给出了采用通过调整中心拉杆的角向位置来严格控制离心叶轮跳动的装配工艺。该装配工艺简单有效，能快速的控制转子的初始不平衡量, 适用于使用中心拉杆紧固的转子组件，已在不同型号和不同承制厂家实施验证，具有实际应用推广价值。Abstract: A typical gas generator rotor structure of turbo shaft engine is introduced, aims at the large range dispersion, and the influence factors of the rotor initial unbalance is studied. Rotor vibration caused by rotor assembly or initial unbalanced of single part is calculated. The most important factor contributing to rotor vibration is the unbalance of the first disc of compressor and the second disc of turbine. Initial unbalance of those two single parts should be reduced, however it would conflict with the control of the whole gas generator rotor balance, which rely on those two discs. Through further analysis of rotor assembly influence, a method of adjusting the angle to central tie rod axis in order to strictly control the centrifugal impeller run-out in the assembly process is proposed. It makes the assembly process simple and effective, and the initial unbalance of the rotor can be quickly controlled. The present method is applicable for the rotor which tightened by a central tie rod, which has been verified in different aero-engines and by different manufacturers.
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Key words:
- turbo shaft engine /
- assembly process /
- initial unbalance /
- gas generator rotor
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