Below are the Things You Should Know Questions for 2009

The main focus of each page should be the primary question. As part of answering this, be sure that you also address the subquestions.

**Note: Students with access to the ASDL network must use the internal ASDL wiki to edit their pages.**

Topic | Student | Question | Subquestions | |
---|---|---|---|---|

1 | Ideal Gas | Jade Cheong | What is an ideal gas? | What causes a gas to be non-ideal? Can a viscous gas be modeled as an ideal gas? Why is modeling a gas as ideal useful? |

2 | Speed of Sound | Anshuo Liu | In a general sense, what is the speed of sound? | How do we calculate it? Provide an example from fundamental fluid properties. How is it related to compressibility? |

3 | First Law of Thermodynamics | Robert Taylor | What is the first law of thermodynamics? | What are all three possible ways to transfer energy? Scientifically (not grammatically) does it make sense to say an object "does heat" or "does work"? Why? Does it make sense to say an object "has heat" or "has work"? Why? |

4 | Internal Energy | James Kooiman | What is internal energy? | On a molecular scale, what types of energy contribute to internal energy? What types of problems are more easily solve with internal energy instead of enthaply? |

5 | Second Law of Thermodynamics | Johanna Ceisel | What is the second law of thermodynamics? | Give two classic statements of the second law. Give an example of a process that is impossible because of the second law. (Note, you don't need to provide a thorough definition of entropy for this question). |

6 | Entropy | Eriks Osvalds | What is entropy (as it relates to thermodynamics)? | Explain how it relates to the second law of thermodynamics. As an example, explain (qualitatively) how entropy and enthalpy change in the following situations: 1) A gallon of boiling water is poured in an equal mass of cold water. 2) A gallon of boiling water is poured into a lake. Compare the units of entropy to the units of enthalpy. |

7 | Enthalpy | Trevor Laughlin | What is enthalpy? | What types of problems are more easily solved with enthalpy instead of internal energy? |

8 | Work | John Bennewitz | What is work? | Explain the difference between reversible and irreversible processes. How is it measured? |

9 | Power | Lisa Stuber | What is power? | Explain how power can be calculated for mechanical, fluid, electric, and chemical systems (in every case, it is a product of two quantities). |

10 | Pressure | Alex Maag | What is pressure? | What is hydrostatic pressure? What is dynamic pressure? Present a sample problem to calculate each. |

11 | Fluid | Sangin Park | What is a fluid? | How are fluids different from solids? What is a non-Newtonian fluid? |

12 | Vorticity | Robbie Gill | What is vorticity? | Why is vorticity important? How is it different than circulation? |

13 | Viscosity | Philippe Ranque | What is viscosity? | On a molecular level, what causes a gas to be viscous? How does it change with other variables? How do we measure viscosity? |

14 | Continuity Equation | Brandon Bell | What is the continuity equation (as it relates to fluid mechanics)? | Discuss 2- and 3-dimensional and compressible and incompressible cases. |

15 | Reynolds Number | Will Runge | What is the Reynolds number? | Why is it important? Explain how Reynolds number relates to laminar and turbulent flows for internal and external flows. Explain what reference length should be used for flow around different objects. (Ex, pipes, airfoils, cylinders, rockets) |

16 | Stream Function | Jeffrey Jeffrey | What is a stream function? | What are streamlines? When are they used? |

17 | Potential Flow | Luis Vidal | What is a potential flow? | Give examples of flows relevant to aerospace engineering that can and cannot be modeled as potential flows. Can potential flow be used to predict drag of an airfoil? Explain. |

18 | Irrotational Flow | Mark Nelson | What is irrotational flow? | Is it possible to have an irrotational vortex? Why? How is it used to solve problems? |

19 | Divergence Theorem | Jeff Moffett | What is the divergence theorem? | Explain how it is relevant to aerospace engineering. |

20 | Incompressible Flow | Jason Corman | What is incompressible flow? | What is Euler's equation? What is Bernoulli's equation? Give several examples of flows relevant to aerospace engineering that can be modeled as incompressible flows. |

21 | Navier-Stokes Equations | Eberhard Boemcke | What are the Navier-Stokes Equations? | When is it appropriate and feasible to use them? |

22 | Friction Coefficient | Thomas Carroll | What is the friction coefficient? | Is it larger for a turbulent boundary layer or for a laminar boundary layer? Why? How can we relate the friction coefficient for the two conditions? |

23 | Boundary Layer | Jesse Kallman | What is a boundary layer? | What are some different ways to define boundary layer thickness? What is a thermal boundary layer? What is the Blasius Profile? |

24 | Drag | Jean-Baptiste Mercier | What is drag? | What are the common sources and types of drag? What direction does the drag force point(provide a useful diagram)? |

25 | Lift | Ludo Hivin | What is lift? | Explain lift in terms of a pressure differential and conservation of momentum. Are the two theories compatible? What direction does the lifting force point(provide a useful diagram)? |

26 | Momentum Equation | Siva Harikumar | What is the Momentum Equation? | Explain, in words, how it is derived. When is it appropriate to use it? |

27 | Thin Airfoil Theory | Mark Weiland | What is thin airfoil theory? | What does it say about the lift curve slope? What does it say about drag? When can thin airfoil theory be used? |

28 | Center of Pressure | Pavan Raghuram | What is the center of pressure of an airfoil? | Where is it located in low-speed flow? In high-speed flow? How does it depend on airfoil geometry? What is the difference between the center of pressure and the aerodynamic center? |

29 | Compressible Flow | Wiliam Bowden | What is compressible flow? | Under what conditions do we consider a flow to be compressible? What makes compressible flows more challenging to solve than incompressible flows? |

30 | Shock | Michael Jones | What is a shock? | What is a normal shock? What is an oblique shock? What are the normal shock relations. Is flow across a shock adiabatic? Isentropic? What are shock relations? |

31 | Prandtl-Meyer Expansion | Philip Sondervan | What is a Prandtl-Meyer Expansion? | How do the flow properties change from before to after the expansion? What is the Mach angle? |

32 | Critical Mach Number | Gautham Voleti | What is the critical Mach number? | How do you calculate it? What parameters determine the critical Mach number for a 2-D infinite body and for a 3-D body? How do they effect the critical Mach number? |

33 | Elliptic Loading | Brandon Sforzo | What is "elliptic loading" on a wing? | Why is this desirable? How can it be achieved with a non-elliptical wing? |

34 | Payload Range Diagram | Mike Mueller | What is a payload-range diagram? | How is it created? When is it useful? |

35 | Breguet Range Equation | Alex Dessanti | What are the Breguet range and endurance equations? | Explain, in words, how to derive them. When are they appropriate to use? |

36 | Angle of Attack | Jonathan Herault | What is the angle of attack of an aircraft? | What are the induced and effective angles of attack? Why are these important to know? What is the difference between pitch angle and angle of attack? Can the pilot choose it, or does it "fall out" as a result of some equilibrium? |

37 | Stall | John Robinson | What is stall? | What are some types of stall? How can it be mitigated? |

38 | Aircraft Engines | Sridevi Pogaru | What are typical types of aircraft engines used? | Under what flight conditions and missions is each type preferred? |

39 | Thrust Equation | Jon Gladin | What is the "thrust equation"? | How does it change for rockets? What is propulsive efficiency? |

40 | Fatigue | Ben Havrilesko | What is fatigue? | Do all materials fatigue in the same way? Why? What is the fatigue limit? How is it considered in the design process? What is an S-N diagram? |

41 | V-n Diagram | Tom Ahern | What is a V-n Diagram? | Show an example and explain all important features and points. |

42 | Stress and Strain | Faisal Ahmed | What are stress and strain? | What are the different types? How do we measure them? |

43 | Aircraft Stability | Felipe Ortega | How do we describe aircraft stabilty? | What are typical stability modes? |

44 | Reference Frame | Haoyun Fu | What are typical frames of reference for Aerospace? | How do they relate to each other? When is each type used? How does their relation help us understand Coriolis force? |

45 | Wind Tunnel | William Revell | What is a wind tunnel? | How do they work? What are some common types? |

46 | Airfoil | Chris Argote | What is an airfoil? | What are common types, naming schemes, characteristics (such as camber and thickness) and methods for varying them? |

47 | Converging-Diverging Nozzle | Sheldon Smith | What is a converging-diverging nozzle? | What does it mean to be overexpanded or underexpanded? How do different flows change as they go through the nozzle? |

48 | Aspect Ratio | Philipp Witte | What is the Aspect Ratio of a wing? | How do we calculate it for irregular wing planforms? What is the effect of changin aspect ratio on common aerodynamic parameters? Why? |

49 | Pitot Tube | Tim Carr | What is a Pitot tube? | Present an example problem that calculates stagnation pressure at the probe tip given a flow speed, static temperature, and static pressure appropriate for an aircraft in cruise. What is the difference between a Pitot tube and a Pitot static tube? |

50 | Aerodynamic Coefficient | Trey Kasling | What are the common aerodynamic coefficients? | How are they calculated? Why do we use them? |

51 | Buckingham-Pi Theorem | Marc Mugnier | What is the Buckingham Pi Theorem? | When is it useful? Give an example. |

52 | Atmospheric Properties | Angie Lowe | Describe how pressure, temperature, and density vary with altitude. | Explain why each variation occurs. Why does temperature decrease as you go up, even though you're getting closer to the sun? Why does it eventually stop decreasing? What is the lapse rate? |