Resume

• 2009

  Doctor of Philosophy (Ph.D.)

  Effects of sand and dust ingestion on turbomachinery. Development of a hybrid particle tracking velocimetry and computational fluid dynamics measurement technique. Experimental analysis of sand impacts on turbomachinery materials at high temperatures.

  Mechanical Engineering

  Virginia Tech

• 2007

  Master's of Science (M.S.)

  Experimental heat transfer

  thin film gage and infrared temperature measurements on turbine airfoils.

  Mechanical Engineering

  Virginia Tech

• 2003

  Bachelor's degree

  Mechanical Engineering

  VT Soccer Club

  Hybrid Electrical Vehicle Team

  American Society of Mechanical Engineers

  Virginia Tech

• Microsoft Office

  Algorithms

  Labview

  Materials Science

  CFD

  R&D

  Thermodynamics

  Image Processing

  Fortran

  Heat Transfer

  Physics

  Mathematical Modeling

  Matlab

  Mechanical Engineering

  Numerical Analysis

  Linux

  Signal Processing

  Research

  CFX

  C++

  An Experimental Investigation of Showerhead Film Cooling Performance in a Transonic Vane Cascade at Low and High Freestream Turbulence

  Hee-Koo Moon

  Wing Ng

  Shakeel Nasir

  An Experimental Investigation of Showerhead Film Cooling Performance in a Transonic Vane Cascade at Low and High Freestream Turbulence

  Luzeng Zhang

  Hee-Koo Moon

  Wing Ng

  Andrew Newman

  This paper describes a method for obtaining surface and endwall heat transfer in an uncooled transonic cascade facility using infrared thermography measurements. Midspan heat transfer coefficient results are first presented for an engine representative first stage nozzle guide vane at exit Mach number of 0.77

  Reynolds number of 1.05×106 and freestream turbulence intensity of 16%. The results obtained from infrared thermography are compared with previously published results using thin film gauges in the same facility on the same geometry. There is generally good agreement between the two measurement techniques in both trend and overall level of heat transfer coefficient over the vane surface. Stanton number contours are then presented for a blade endwall at exit Mach number of 0.88

  Reynolds number of 1.70×106 and freestream turbulence intensity of 8%. Infrared thermography results are qualitatively compared with results from a published work obtained with liquid crystals at similar flow conditions. Results are qualitatively in agreement.

  A Transient Infrared Technique for Measuring Surface Heat Transfer In A Transonic Turbine Cascade

  Wing Ng

  Jacob Delimont

  Large amounts of tiny microparticles are ingested into gas turbines over their operating life

  resulting in unexpected wear and tear. Knowledge of such microparticle behavior at gas turbine operating temperatures is limited in published literature. In this study

  Arizona road dust (ARD) is injected into a hot flow field to measure the effects of high temperature and velocity on particle rebound from a polished 304 stainless steel (SS) coupon. The results are compared with baseline (27 m/s) measurements at ambient (300 K) temperature made in the Virginia Tech Aerothermal Rig

  as well as previously published literature. Mean coefficient of restitution (COR) was shown to decrease with the increased temperature/velocity conditions in the VT Aerothermal Rig. The effects of increasing temperature and velocity led to a 12% average reduction in COR at 533 K (47 m/s)

  15% average reduction in COR at 866 K (77 m/s)

  and 16% average reduction in COR at 1073 K (102 m/s) compared with ambient results. The decrease in COR appeared to be almost entirely a result of increased velocity that resulted from heating the flow. Trends show that temperature plays a minor role in energy transfer between particle and impact surface below a critical temperature.

  Study of Microparticle Rebound Characteristics Under High Temperature Conditions

  Wing Ng

  A novel particle tracking velocimetry (PTV)/computational fluid dynamics (CFD) hybrid method for measuring coefficient of restitution (COR) has been developed which is relatively simple

  cost-effective

  and robust. A laser and camera system is used in the Virginia Tech Aerothermal Rig to measure velocity trajectories of microparticles. The method solves for particle impact velocity at the impact surface using a CFD solution and Lagrangian particle tracking. The methodology presented here attempts to characterize a difficult problem by a combination of established techniques

  PTV and CFD

  which have not been used in this capacity before. Erosion and deposition are functions of particle/wall interactions and COR is a fundamental property of these interactions. COR depends on impact velocity

  angle of impact

  temperature

  particle composition

  and wall material. Two sizes of Arizona road dust and one size of glass beads are impacted on to a 304 stainless steel coupon. The particles are entrained into a free jet of 27 m s−1 at room temperature. Impact angle was varied from 85° to 25° depending on particle. Mean results collected using this new technique compare favorably with trends established in literature. The utilization of this technique to measure COR of microparticle sand will help develop a computational model and serve as a baseline for further measurements at elevated air and wall temperatures.

  Measuring the coefficient of restitution of high speed microparticle impacts using a PTV and CFD hybrid technique

  Wing Ng

  Danesh Tafti

  Sukhjinder Singh

  ASME HT2012-58100

  A two pass stationary square duct with rib turbulators subjected to sand ingestion is studied using Large Eddy Simulations (LES). Each pass has ribs on two opposite walls and aligned normal to the main flow direction. The rib pitch to rib height (P/e) is 9.28

  the rib height to channel hydraulic diameter (e/Dh) is 0.0625 and calculations have been carried out for a bulk Reynolds number of 25

  000. Particle sizes in the range 0.5–25 μm are considered

  with the same size distribution as found in Arizona Road Dust (medium). Large Eddy Simulation (LES) with wall-model is used to model the flow and sand particles are modeled using a discrete Lagrangian framework. 220

  000 particles are injected at the inlet and perfectly elastic collisions with the wall are considered. Results quantify the distribution of particle impingement density on all surfaces. Highest particle impingement density is found in the first quarter section of the second pass after the 180° turn

  where the recorded impingement is more than twice that of any other region. It is also found that the average particle impingement per pitch is 28% higher in the second pass than the first pass. Results show lower particle tendency to hit the region immediately behind the rib in the first pass compared to the second pass where particle impingement is more uniform in the region between two ribs. The smooth walls do not show much particle impingement except the wall in second pass where the flow impinges after the turn. The rib face facing the flow is by far is the most susceptible to impingement and hence deposition and erosion. The results of this simulation were also compared with results obtained from experiments conducted on an identical two pass geometry with Arizona Road Dust particles. The particle impingement pattern is recorded by using a sticky tape on all surfaces to capture the particles. The numerical predictions showed good qualitative agreement with experimental measurements.

  Sand Transport in a Two Pass Internal Cooling Duct with Rib Turbulators

  Reagle

  Caterpillar Inc.

  TECHNOLOGY IN BLACKSBURG

  Virginia Tech

  George Mason University - Volgenau School of Engineering

  Honeywell Aerospace

  Alstom Power

  TECHNOLOGY IN BLACKSBURG

  Birr

  Aargau

  Switzerland

  Praktikant

  Alstom Power

  Phoenix

  AZ

  Intern

  Honeywell Aerospace

  Fairfax

  Virginia

  Assistant Professor

  George Mason University - Volgenau School of Engineering

  Christiansburg

  VA

  Principal Research Engineer

  TECHNOLOGY IN BLACKSBURG

  Christiansburg

  VA

  Research Engineer

  TECHNOLOGY IN BLACKSBURG

  Virginia Tech

  Virginia Tech

  Blacksburg

  VA

  Thermodynamics

  Instructor

  George Mason University - Volgenau School of Engineering

  Caterpillar Inc.

  Intern

  Peoria

  Illinois Area

  American Society of Engineering Education

  Member

  American Society for Mechanical Engineers

  George Mason University

  Fenwick Fellow

  The role of renewables in George Mason University’s future energy portfolio

  George Mason University

  Outstanding Achievement Award

  George Mason University

  ASME Best Paper

  Reagle

  C.J.

  Delimont

  J.M.

  Ng

  W.F.

  and Ekkad

  S.V.

  2013 “Study of Microparticle Rebound Characteristics Under High Temperature Conditions”

  Coal

  Biomass

  and Alternative Fuels Committee