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STUDY OF THREE-DIMENSIONAL EFFECTS ON AEROELASTIC CHARACTERISTICS OF CASCADE

叶栅气动弹性特性的三维效应研究

基本信息

批准号：
61550048
负责人：
NAMBA Masanobu
金额：
$ 1.41万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550048/
关键词：
Unsteady Cascade Subsonic Cascade Supersonic Cascade Three-Dimensional Unsteady Flow Sound Absorbing Wall Effect Steady Loading Effect フラッター空力弾性

项目摘要

1. Effects of sound absorbing wall linings Computer programs have been developed for the prediction of unsteady aerodynamic forces on vibrating stator and rotor cascades in subsonic and supersonic flows. Effects of sound absorbing side walls upon unsteady aerodynamic forces are much more significant for supersonic cascades than for subsonic ones. If the acoustic admittance of the wall is dependent on sound frequency as is usually the case, the wall effects on rotor cascades are much different from those on stator cascades, because a rotor cascade in simple harmonic vibration generates a multi-frequency sound field.2. Aerodynamic characteristics of cascade vibrating with nonuniform steady loadingComputer programs for 2-dimensional subsonic and supersonic cascades and 3-dimensional subsonic cascades have been developed for the prediction of unsteady aerodynamic forces on vibrating blades with steady loadings, using the double linearization theory. The validity of the double linearization theory has been confirmed by comparison of the results with those by more accurate numerical field methods (FEM and a successive approximation method). Effects of incidence, camber and blade thickness and their spanwise nonuniformity have been made cleary by extensive numerical studies.The critical incidence angles on the bending flutter boundary for supersonic cascades are much smaller than those for subsonic cascades. In the case of subsonic cascades a spanwise distribution of steady loading increasing from hub to tip is favourable for attaining stable (free from bending flutter) operation with large total steady loadings.Extension of the double linearization theory to 3-dimensional supersonic cascade and rotating annular cascade models is being developed. Application of a finite element method to 3-dimensional oscillating cascades is also being conducted.

1.吸声壁衬的影响已经开发了计算亚音速和超音速流中振动静叶栅和动叶栅上非定常气动力的计算机程序。吸声侧壁对超音速叶栅非定常气动力的影响比亚音速叶栅大得多。如果壁面的声导纳通常与声频有关，则由于简谐振动的转子叶栅产生多频声场，因此，壁面效应对转子叶栅的影响与对定子叶栅的影响有很大不同.非均匀定常载荷作用下振动叶栅的气动特性本文采用双线性化理论，编制了二维亚音速、超音速叶栅和三维亚音速叶栅的计算程序，用于计算定常载荷作用下振动叶片上的非定常气动力。通过与更精确的数值场方法（有限元法和逐次逼近法）的结果比较，证实了双线性化理论的有效性。通过大量的数值研究，明确了冲角、弯度、叶片厚度及其展向非均匀性的影响，发现超声速叶栅弯曲颤振边界的临界冲角比亚声速叶栅小得多。在亚音速叶栅的情况下，稳定载荷的展向分布从叶毂到叶尖逐渐增加，这有利于在总稳定载荷较大的情况下实现稳定（无弯曲颤振）操作。目前正在发展将双线性化理论推广到三维超音速叶栅和旋转环形叶栅模型的方法。还在对三维振荡叶栅应用有限元法。