ME 462: Capstone Design

1
Design of a Nulling Yaw Probe for a Gas Turbine
Engine Test Rig
ME 462 Capstone Design Group Members Steve
Collins Bill Donelson Allison
Heying Brent Miller Faculty Advisor Dr. Jie
Chen
Corporate Sponsors Rolls-Royce
Dr. Kurt F. Weber Bruce
Crook
Presented May 4, 2006
2
Design Problem

• Design an apparatus to self-null a yaw probe in a
  gas turbine engine test rig with the following
  customer requirements
• Radial motion of 2 in increments of 0.1
• Circumferential motion around the annulus
• Yaw motion over 180 with accuracy of 0.5

3
Design Functions

• Determine the flow angle utilizing fully
  automated controls, i.e. self-null the probe
• Measure the total pressure
• Collect data over the entire flow annulus
• Mount downstream of the inner ring

4
Project Justification

• Validation testing of fluid flow over combustor
  saddles
• Correlate CFD models of total pressure
  fluctuations which can cause blade forcing
• High altitude engine performance prediction for
  T-56 Engine

5
Project Management

• Task List
• Deliverables
• Objectives
• Required Personnel
• Required Time
• Gantt Chart

6
Self-Nulling Yaw Probe
Nulled when P2 P3
f Yaw Angle P1 Total Pressure
7
Automated Self-Nulling

• L.C. Smith Controller
• Executes Automated Self-Nulling
• Displays Flow Angle

8
Self-Nulling Process
Video
9
Current Design

• Capabilities
• Radial motion
• Circumferential motion
• No flow angle
• measurements

10
New Design

• Capabilities
• Integration of a stepper motor to
  facilitate measurement of yaw angle
• Stepper motor provides 0.25 increments
• Motor bracket provides housing for gearing and
  support for the pressure probe
• Potentiometer provides feedback to L.C. Smith
  Controller

11
New Design (cont.)

• Capabilities Continued
• New apparatus attaches to existing rack via motor
  support
• Dovetail slides constrain motor along radial path

12
ANSYS Analysis
Motor support assembly in vertical position
Displacement
Stress
Max stress 1,040 psi Yield stress 40,611 psi
Max 0.000524 in
13
ANSYS Analysis Cont.
Motor support assembly in horizontal position
Displacement
Stress
Max stress 206 psi Yield stress 40,611 psi
Max 0.000115 in
14
Fulfillment of Requirements

• Yaw motion
• Target 180 with 0.5 accuracy
• Final design 180 with 0.25 accuracy

• Radial motion
• Target 2 inches of motion
• Final design 2 inches of motion

• All other targets
• Met since aspects of benchmark that fulfilled
  requirements were kept for final design

15
Conclusions

• All engineering specifications were either met or
  exceeded
• Working prototype with a cost of 310.00
• Compact design makes it compatible with other
  engine test rigs

16
Recommendations
New Design
Old Design

• Widen the cut out in the inner ring a ¼ inch
• Relocate the static pressure tap tube
• 4 tapped holes to attach the dovetail slides
• Determine the added resistance to the motor
  wiring to make it
• compatible with the L.C. Smith

17
Questions
Special Thanks To Dr. Kurt F. Weber Bruce
Crook Rolls-Royce Corporation Dr. Jie Chen