J002 - Annex A Cadet User Scenarios.pdf

Annex A: Cadet User Case Scenarios

Design the wind tunnel system solution to best achieve the following goals to support the CME aeronautical engineering POI.

1) Demonstrate most theoretical concepts covered in CME offered fluids and aerodynamics courses in an experiment.

a) Cadet Smith conducts a wind tunnel laboratory as part of ME387 to calculate the lift curve slope of multiple airfoils.

b) Cadet Smith gathers wind tunnel based drag polar information on a Cessna Stationair model to compare against flight lab data he will collect later in the course. This data will be used in the writing of his final lab report for the course.

c) Cadet Smith learns about the concepts of total, static, and dynamic pressure through taking in-class measurements with a barometer and pitot-static system.

d) Professor Jones conducts an in-class demonstration of how bias and precision uncertainty exists in measurements such as test section dynamic pressure. Cadet Smith uses the data collected in class to complete a homework assignment estimating the uncertainty of the data.

e) Cadets conduct a laboratory determining wind tunnel power consumption and efficiency of each wind tunnel section.

f) Cadet Smith uses an airfoil with pressure ports connected to a manometer bank to measure the pressure distribution around an airfoil and calculate lift and pressure drag.

g) Professor Jones demonstrates the use of a wake rake behind an airfoil or shape to measure momentum loss (or momentum thickness) and calculate drag.

h) Professor Jones demonstrates flow separation through a flow visualization of airfoil and wing stall.

i) Professor Jones demonstrates the effect of Reynold’s Number on lift and drag through airfoil measurements. Professor Jones demonstrates the effect of laminar vs turbulent flow on drag through the use of trip strips applied to a model.

j) Professor Jones conducts a flow visualization of wingtip vortices on a finite wing.

k) Professor Jones demonstrates the concept of a boundary layer using a flat plate and hotwire anemometer.

l) Professor Jones conducts an in-class demonstration of a pitot-static system for use in airspeed measurement.

m) Professor Jones conducts a hands-on walkthrough of the different components of a wind tunnel, their purpose, design considerations, and effect on overall wind tunnel operations.

n) Professor Jones demonstrates and compares the use of external vs. internal balances for measuring forces and moments on a wind tunnel model.

o) Professor Jones conducts demonstrations on different techniques for flow visualization, including the use of smoke, yarn tufts, surface oil, etc. for the subsonic tunnel and PIV for the supersonic tunnel.

p) Professor Jones demonstrates the concepts of solid and wake blockage corrections using a pitot tube mounted on a traversing mechanism to measure local dynamic pressure around a model or object installed in the tunnel.

q) Professor Jones demonstrates changes to the lift curve slope while using flaps on an airfoil and conducts a smoke flow visualization of airfoil around the high lift device.

r) Professor Jones conducts a Schlieren image demonstration of oblique shock waves produced over a wedge in supersonic flow, and compares the observed shock angle with the predictions from course material.

s) Professor Jones demonstrates a bow shock on a blunt body using Schlieren images.

2) Experimentally predict performance and stability of airfoils, wings, UAVs, drones, and small aircraft.

a) Cadet Smith conducts a wind tunnel laboratory as part of ME387 to calculate the lift curve slope of multiple airfoils.

b) Cadet Smith gathers wind tunnel based drag polar information on a Cessna Stationair model to compare against flight lab data he will collect later in the course. This data will be used in the writing of his final lab report for the course.

c) Cadet Smith conducts a wind tunnel test on the glider he designed and fabricated as part of the final ME481 project. Cadet Smith uses his wind tunnel data to predict performance and stability of his design before conducting the final flight test for the course.

d) Cadet Smith uses an airfoil with pressure ports connected to a manometer bank to measure the pressure distribution around an airfoil and calculate lift and pressure drag.

e) Professor Jones conducts demonstrations of aircraft stability derivatives by conducting pitch sweeps on a model with varying elevator positions.

f) Professor Jones conducts demonstrations on different techniques for flow visualization, including the use of smoke, yarn tufts, surface oil, etc. for the subsonic tunnel and PIV for the supersonic tunnel.

g) Professor Jones demonstrates calibration of a wind tunnel measurement system using a traceable working standard and the linear regression method of determining residual uncertainty in the measurement.

h) A Cadet Capstone team conducts a test on a small UAV to determine the drag polar and predict UAV performance such as maximum range, maximum endurance, climb rate, takeoff distance, landing distance, and accelerated performance.

i) A Cadet Capstone team conducts an analysis of control surfaces on a UAV to calculate control authority.

j) A Cadet Capstone team conducts pitch and yaw sweeps on a UAV to determine the stability derivatives and static margin.

k) Professor Jones demonstrates the different components of the Data Acquisition (DAQ) system of a wind tunnel and the data reduction process to calculate aerodynamic coefficients.

l) Cadets conduct an aircraft model test including a build-down and build-up of drag components and present the drag polar and stability derivatives for the model.

3) Experimentally predict aerodynamic forces and moments on objects, vehicles, parachutes, and civil structures.

a) Professor Jones demonstrates the use of a wake rake behind an airfoil or shape to measure momentum loss (or momentum thickness) and calculate drag.

b) Professor Jones conducts an in-class demonstration of pressure drag measurements and calculation of drag coefficient on multiple shapes to compare against published values.

c) Professor Jones demonstrates and compares the use of external vs. internal balances for measuring forces and moments on a wind tunnel model.

d) Professor Jones demonstrates flow visualization of an atmospheric boundary layer through a model of an urban area.

e) A Cadet Capstone team conducts drag experiments on a parachute or descent device.

f) Cadets conduct a drag analysis on external items for vehicles.

g) Cadets conduct a drag and stability analysis on civil structures such as towers, cables, buildings, etc.

h) Cadets measure velocity and conduct contaminant dispersal visualization for flow over models of urban and natural topography.

i) Cadets conduct an overturning analysis on a surface vessel subject to a storm or high winds

j) Cadets conduct analysis on sails to determine performance.

4) Support research projects and Cadet independent studies through adaptable and/or modular experimental capability.

a) Cadet Smith conducts a wind tunnel test on the glider he designed and fabricated as part of the final ME481 project. Cadet Smith uses his wind tunnel data to predict performance and stability of his design before conducting the final flight test for the course.

b) Professor Jones demonstrates calibration of a wind tunnel measurement system using a traceable working standard and the linear regression method of determining residual uncertainty in the measurement.

c) A Cadet Capstone team conducts a test on a small UAV to determine the drag polar and predict UAV performance such as maximum range, maximum endurance, climb rate, takeoff distance, landing distance, and accelerated performance.

d) A Cadet Capstone team conducts an analysis of control surfaces on a UAV to calculate control authority.

e) A Cadet Capstone team conducts pitch and yaw sweeps on a UAV to determine the stability derivatives and static margin.

f) A Cadet Capstone team conducts drag experiments on a parachute or descent device.

g) Cadets conduct a drag analysis on external items for vehicles.

h) Cadets conduct a drag and stability analysis on civil structures such as towers, cables, buildings, etc.

i) Cadets measure velocity and conduct contaminant dispersal visualization for flow over models of urban and natural topography.

j) Cadets conduct an overturning analysis on a surface vessel subject to a storm or high winds

k) Cadets conduct analysis on sails to determine performance.

l) Cadets conduct a verification of CFD analysis through experiments in the wind tunnel, either by running CFD on an existing model or 3D printing a model consistent with the CFD analysis.

m) Cadets conduct an aircraft model test including a build-down and build-up of drag components and present the drag polar and stability derivatives for the model.

n) Cadets conduct an experiment determining drag on a model vehicle attached to an external balance.

o) Cadets conduct an analysis of the aerodynamic coefficients on a projectile.