Mixing losses investigation of fan cascade bide

مقدم أطروحة جامعية

al-Fattal, Dina Ali

الجامعة

الجامعة التكنولوجية

الكلية

قسم هندسة المكائن و المعدات

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2006

الملخص الإنجليزي

In the present work the wake mixing losses have been investigated.

These investigations are conducted upon a fan cascade blade.

A five-hole probe with a diameter of (1.25 mm) is used to measure the flow field downstream of the cascade.

The calibration is performed over ±20° yaw and ±20° pitch at free stream velocity of (10.6 m/sec) which indicate a Reynolds number based on duct hydraulic diameter of 0.85X10" to give a calibration map made up of 9 yaw angles and 9 pitch angles.

Geometric nulling is used to define 0 degrees yaw and 0 degrees pitch both in the calibration in the later measurement set-ups.

The data collected by the five-hole probe is found to be very useful to estimate CP.S.

CI\.

velocity and KM contours.

The area of the critical stagger angles has been investiaated durina the course of the experiment.

At the critical slacker angle (k= 50 degree), the vortex core is increased in number and size in the streamvvise direction especially near the blade suction side as will as the static pressure coefficient contour values.

The total pressure coefficient contour CPL increased in values bv 22% with small increment L of stagger angle of 2 deg toward the critical stagger angles and the total pressure loss is also increased.

The mixing losses seems to live relatively long as the flow mixes out completely especially at critical stagger angles.

In order to acquire the experimental current program such as experimental facilities, instrumentation and measurement technique ANSYS software has been used to predict the flow field parameter.

The ANSYS software gives very interesting results that can be used to verify the experimental analysis.

التخصصات الرئيسية

الهندسة الميكانيكية

الموضوعات

• الديناميكا الهوائية

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-305443