Flashcards
Chapter 2
Cards in this deck (41)
- 1how is airflow describedstreamlined
- 2what are the two different types of stremalinedturbulent and laminar
- 3what can you say about the molecules travelling over the aircraft wingthey have the same velocity and pressures as the preceding molecules, despite these values altering from point to point along the streamline
- 4what does it mean when the streamlines are close together in regards to velocityhigher velocity
- 5what does it mean when the streamlines are close together in regards to dynamic pressurePD is higher
- 6what does it mean when the streamlines are close together in regards to static pressurePS decreases
- 7what is turbulent flow described asthe mixing flow of the streamlines
- 8what do we call the streamlines closest to the wingthe boundary layer
- 9is the boundary layer turbulent or laminarcan be either
- 10when is turbulent air flow often causedround areas of sharp changes in direction
- 11what happens when turbulent flow occursthe molecules follow a different path from the preceding and cause unsteady flow and wasted energy
- 12what is the equation of continuitymass flow = A x V x roe
- 13what is important to remember about the equation of continuitythat for low speeds, less than mach 0.4, roe is constant so the equation becomes
MF = A x V - 14what is Bernoulli's Theoremtotal pressure = PS + PD
- 15what is assumed for bernoulli's theorem to be truethat energy can be neither created or destroyed
- 16How is bernoullis theorem related the venturi effectif bernoullis theorem is true then the venturi effect will take place
- 17what is the venturi effectbc energy cannot be created or destroyed then the total energy stays the same, then the dynamic and static pressure are inversely proportional
- 18where is the venturi convergent ductwhere the tube decreases in area
- 19where is the venturi divergent ductwhere the area increase in size
- 20which pressure decreases in the convergent ductstatic pressure
- 21why does the static pressure decrease in the venturi ductbecause the velocity has increased and therefore the dynamic pressure has increased.
- 22does the dynamic pressure increase or decrease in the divergent ductdecrease, as velocity has decreased
- 23what can flow over the upper part of the wing be compared toflow in the convergent duct
- 24what can flow over the lower part of the wing be compared to?flow in the divergent duct
- 25what is another word for total pressurestagnation or pitot pressure
- 26what is the equation for forcef= pressure x area
- 27what is airflow in a 2D area referred to aseffective airflow
- 28what is a stagnation pointwhere pd is at a minimum
- 29what is the velocity at a stagnation point0
- 30what is the divergence over the leading edge of the wing calledUPWASH
- 31What is the convergence over the trailing edge of the wing calleddownwash
- 32what are the 3 things that can describe airflowDirection
magnitude
condition - 33what is the magnitude of the relative airflowTAS
- 34define total reactionthe resultant of all the aerodynamic forces acting on the aerofoil section
- 35What does CP stand forCentre of pressure
- 36define CPthe point on the chord line through which the lift is considered to act
- 37define Liftthe aerodynamic force that acts 90˚ to relative airflow
- 38define Dragthe force that acts parallel to and in the same direction as the relative airflow
- 39angle of attack is also referred to asaerodynamic incidence
- 40what is the greek symbol for angle of attackALPHA
- 41—
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- POF Flashcards on Chapter 2, created by Ella Davies on 15/02/2018.
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- Ella Davies
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