Experimental investigation and numerical simulation of fluid-structure interaction in axial fan system

مقدم أطروحة جامعية

Mahdi, Ali Muuhammad Rida

مشرف أطروحة جامعية

Yusuf, Asim Hamid
al-Janabi, Wafa Abd Suud Hamid

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم الهندسة الكهروميكانيكية

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2010

الملخص الإنجليزي

Fluid-structure interaction problem is one of a great challenge at different fields in engineering and applied sciences and has been considered in the present work numerical and experimentally.

The main objective of the present work is to study the fluid-structure interaction of a duct fan system.

The dynamic characteristics of the fluid-structure interaction of the duct fan system are numerically predicted and experimentally measured.

The fan system test rig consists of a rotor shaft, axial fan, two journal bearings, hollow shaft, eight probes, inlet bow, duct casing, mesh screen, driven motor, and speed controller.

Professional type sensors are used as measuring instruments.

Numerically, finite element software was used to investigate the dynamic behavior of the fluid-structure interaction problems.

A fluid flow solver is coupled to a structural solver by use of a fluid-structure interface physical environment method (monolithic method).

The integration of the three dimensional Navier-Stokes equations is performed in the time domain, simultaneously to the integration of the three dimensional structural model.

The aerodynamic loads are transferred from the flow to the structure.

The coupling step is repeated within each time step, until the flow solution and the structural solution have converged to yield a coupled solution of the aero elastic set of equations.

When this convergence is achieved, the scheme advances to the next time level.

The ten first eigenvalue (natural frequency) and eigenvector (mode shape for each part of a rotor system individually and system assembly are found.

The average natural frequency rate increased for ten first modes number at the spooled shaft by (44.5) %, at the fan by (27.32) %, at the hollow shaft by (12.455 %) and at the rotor system by (12.3 %) The effective stresses for each part of the rotor system individually and system assembly was estimated at various rotational speeds (500, 1000, 1500, 2000 and 2500) rpm by using ANSYS-11 software.

The maximum value of the stresses recorded at the fan root was (175982 N/m2) and minimum value of the stresses recorded at the rotor shaft was (95.659 N / m2).

The value of the stresses increased with increase of the rotational speed, and the rate of the stresses increased at the rotor system by (52.55).

The validity of the predicted dynamic characteristics of duct fan system was confirmed experimentally by investigating geometrically similar fan system test rig.

Good agreement of dynamic characteristics is observed between experimental and numerical results

التخصصات الرئيسية

الهندسة الميكانيكية

الموضوعات

• ديناميكا الموائع
• الديناميكا الهوائية

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-305316