对转涡轮基本分析

BASIC ANALYSIS OF COUNTER-ROTATING TURBINES

对于对转涡轮基元级的特性,首先分析不同基元级的负荷特性应以单位叶列平均的负荷能力为准。其次,模拟常规级的经典分析,讨论了对转涡轮基元级的自变变量及定义了不同类型的典型对转涡轮基元级,按此可以很简明地得出它们在不同转速比下的负荷特性。同时,还初步比较了对转级与常规级的基元级效率。由此可见,对转涡轮的单位叶列负荷系数可比常规级有成倍的增长而且有更高的效率。

A comprehensive basic analysis for various counter-rotating turbine is given with the blade element assumption. All possible typical schemes of counter-rotating turbine stage are enumerated. A typical three specification of each moving blade for blade element, such as impulse(I), reactive(R)and absolute axial intake, is suggested. Their performances of specific work, load distribution between counter-rotating shaft and efficiency are analysed for different shaft rotating speed ratios. It concluded that the load capacity per unit engine length of counter rotating turbine can be much higher than that of common tubine without efficiency penalty or ever with higher efficiency.