EFFECTS OF SOUND ABSORBING WALL ON BLADE ROW FLUTTER AND SOUND GENERATION UNDER INTERACTION OF MULTIPLE BLADE ROWS

吸声壁对多叶列相互作用下叶列颤振及发声的影响

基本信息

批准号：
16560165
负责人：
NAMBA Masanobu
金额：
$ 2.3万
依托单位：
Sojo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560165/
关键词：
AEROACOUSTICS UNSTEADY AERODYNAMICS AEROELASTICITY BLADE ROW SOUND ABSORBING WALL CONTRA-ROTATING FAN MULTI-STAGE BLADE ROWS NOISE 翼列干渉

项目摘要

An unsteady lifting surface theory was developed for a model of three blade-rows with vibrating blades, to account for the simultaneous effects of adjacent blade rows situated upstream and downstream. A program was coded to compute unsteady aerodynamic force and work on blades for specified frequency, inter-blade phase angle and other design parameters. The validity of the program was confirmed by making a comparison for a model condition between the results from the present program and those of CFD Euler code computation conducted by Professor K.C. Hall of Duke University. Both results were in complete agreement.Parametric studies were conducted to investigate the simultaneous influences of the upsteam and downstream neighboring blade rows on unsteady loading caused by blade vibration. The effects of two downstream blade rows and two-upstream blade rows are also investigated.It is a common understanding that interaction of stator vanes with oncoming rotor wakes is the primary source o … More f the fan tone noise of turbofan engines. A prediction scheme on the basis of genuine 3-dimensional lifting surface theory including the effect of mutual aeroacoustic interaction between the rotor and the stator was developed. The scheme was further modified into a hybrid scheme, which deals with vortical interaction of stator vanes with oncoming vortical wake disturbances from the upstream rotor on the basis of CFD technique and deals with aeroacoustic interaction of the two blade rows on the basis of the unsteady lifting surface theory. A computation program was coded to predict the generated sound power.The above models were further generalized to include the effect of the sound absorbing walls, and the comprehensive models were mathematically formulated.New findings are summarized as follows.(1) The simultaneous influence of the upstream and downstream blade rows can not be accounted for by a simple superposition of interactions between two blade rows. The effect of the next blade row but one is also substantial in the case of very short distances between blade rows.(2) The effect of the acoustic interaction between the rotor and the stator on the radiated sound power is very substantial. The effect heavily depends on the harmonic number of the blade passing frequency. Less

为三个具有振动叶片的刀片排的模型开发了一种不稳定的举升表面理论，以说明位于上游和下游的相邻叶片行的简单效果。对程序进行了编码，以计算不稳定的空气动力学力，并在刀片上进行指定频率，刀片间角角和其他设计参数的工作。通过对本计划的结果与CFD Euler代码计算的CFD Euler代码计算的结果进行比较，确认了该程序的有效性。杜克大学厅。这两个结果都是完全一致的。进行参数研究，以研究上层和下游相邻叶片行对叶片振动引起的不稳定载荷的简单影响。还研究了两个下游刀片行和两个上游叶片行的影响。这是一个普遍的理解，即定子叶片与即将到来的转子唤醒的相互作用是Turbofan发动机的风扇音噪声的主要来源。基于真正的三维起重表面理论的预测方案，包括转子和定子之间相互气声相互作用的影响。该方案进一步修改为一种混合方案，该方案涉及定子叶片与上游转子的涡旋唤醒灾害的涡流相互作用，并根据CFD技术的基础，并涉及在不稳定的提升表面理论的基础上，涉及两个叶片行的空气声相互作用。对计算程序进行了编码以预测产生的声音能力。上述模型被进一步推广，包括吸收声音墙的效果，并且全面的模型是数学制定的。（1）NEW发现如下所示。（1）上游和下游叶片的简单影响不可能由两个简单的互动式互动来解释。在刀片行之间非常短的情况下，下一个刀片行的效果也很大。（2）转子和定子之间的声相互作用对辐射式声音功率的影响非常大。效果在很大程度上取决于刀片传递频率的谐波数。较少的

项目成果

期刊论文数量（23）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

二重反転環状翼列のフラッター解析

对转环形叶栅颤振分析

DOI：
发表时间：
2006
期刊：
日本航空宇宙学会論文集 54・634
影响因子：
0
作者：
Y.Shinohara;K.Toda;M.Yamamoto;西野竜平
通讯作者：
西野竜平

Improved Hybrid Method of Predicting Fan Tone Noise

预测风扇音调噪声的改进混合方法

DOI：
发表时间：
2006
期刊：
Turbomachines : Aeroelasticity, Aeroacoustics and Unstead Aerodynamics, published by Torus Press
影响因子：
0
作者：
M.Kimura;M.Takei;Y.Saito;A.Saima;難波昌伸
通讯作者：
難波昌伸

Flutter Analysis of a Rotating Blade Row under Aerodynamic Interaction with a Neighboring Blade Row

旋转叶片列在与相邻叶片列气动相互作用下的颤振分析

DOI：
发表时间：
2005
期刊：
Proceedings of 43^<rd> AIAA Aerospace Science Meeting and Exhibit AIAA2005-19
影响因子：
0
作者：
村松久巳;足立将明;Shinzaburo Umeda;児島忠倫他;村松久巳;難波昌伸
通讯作者：
難波昌伸

Flutter Analysis of Contra-Rotating Blade Rows