Aerodynamics and flight mechanics

Assignment Help Mechanical Engineering
Reference no: EM13599

Question 1

The NACA 4412 airfoil has a mean camber line given by

100_Aerodynamics and Flight Mechanics.png

By using thin airfoil theory, calculate

a. Its zero-lift angle of attack.
At the angle of attack of 3o, calculate the followings:

b. Its lift coefficient.

c. The moment coefficient about its quarter-chord point.

d. The location of its center of pressure (xcp/c) and aerodynamic center (xac/c).

The experimental data for NACA 4412 airfoil are given in the Appendix of this Homework set (from Abbott, I.H., von Doenhoff, A.E., and Stivers, Jr., L.S., "Summary of Airfoil Data," NACA Report No. 824, 1945).

e. Compare your results from parts a, b, and c above with the NACA 4412 experimental data and express the percentage difference between your results and experiment.

Question 2

A positively cambered airfoil with a zero-lift angle of attack of -3o has a lift slope of 0.1 per degree.

a. Calculate the lift coefficient at an angle of attack of 5o.

b. Now the same airfoil is turned upside-down (so it becomes an airfoil with a negative camber). Calculate its lift coefficient at the same angle of attack of 5o as in part a.

c. At what angle of attack must the upside-down airfoil be set to generate the same lift as that when it is right-side-up at a 5o angle of attack?

Question 3

A two-dimensional thin wing was tested in a wind tunnel. The pitching moment coefficient about the leading edge (Cm,LE) at zero-lift was found to be -0.02. At angle of attack of 8 deg, Cl = 0.7, Cd = 0.04 and Cm,LE = -0.2. Determine the location of the aerodynamic center of this wing.

Question 4.

Spanwise circulation distribution for a wing of span b in an air flow of density ρ∞ and speed V is parabolic as follows:

684_Aerodynamics and Flight Mechanics1.png

a. Calculate the downwash induced by this circulation at any position y0 along the wing span. Calculate also the downwash at the root of the wing.

b. Find the total lift generated by the wing.

Question 5.

A thin spanwise symmetrical wing has an aspect ratio of 10 and a straight edges with taper ratio (tip chord / root chord) of 0.8 and root chord of 1 m. This wing does not have geometric or aerodynamic twist and it has symmetrical airfoil profile.

a. Compute, using 4 terms in the expansion, the spanwise efficiency factor, e, and plot its drag polar if its zero-lift drag is 0.01.

b. Determine lift coefficient and induced-drag coefficient of the wing at an angle of attack of 4o.

Question 6. The wing of a light, single-engine general aviation aircraft has an area of 15.8 m2 and a span of 9.6 m. The airfoil of the wing is NACA 65-415, which has a lift slope of 0.1033 per degree and zero-lift angle of attack of -3o. Assume the span efficiency factor of 0.893.

a. If the wing is to produce 11 kN lift while cruising at 190 km/h at standard sea level, calculate the geometric angle of attack that the wing should be set to.

b. Calculate also the induced drag experienced by the wing in that condition.

Reference no: EM13599

Questions Cloud

Mountain man brewing company: case analysis : Mountain Man Brewing Company: Bringing the Brand to Light" case to complete a formal written case analysis.
Design and modelling of adsorption chromatography : Design and modelling of adsorption chromatography based on isotherm data
Create a assembly language subroutine : Create a assembly language subroutine MULSUM that takes an array named A containing n bytes of positive numbers, and fills two arrays, array B containing n words and array C containing n long words
Create the graph using matlab functions : Create the graph, which contains a piecewise function where a line exists in the first interval, a parabola in the second interval, and the sine function in the third interval.
Aerodynamics and flight mechanics : Write a short technical report on Frequency Division Multiplexing
Frequency division multiplexing : Write a short technical report on Frequency Division Multiplexing
Create a window in java : Create a window apllication in java
Investigating a dynamic movement in polar coordinates : Investigating A Dynamic Movement in Polar Coordinates
What is the magnitude of the current in the wire : What is the magnitude of the current in the wire as a function of time?


Write a Review


Mechanical Engineering Questions & Answers

  Advanced design methodologies

8 x product engineering and design review (week 2 – 12), ~3 pages per item which must contain a brief description of the product then delve into concepts such as materials selection, manufacturing methods, life cycle analysis, recyclability and overa..

  Write a paper on boyle''s law

Write a paper on Boyle's law and describe Compression and Combustion stroke . Also explain Charles's law and illustrate SI engine and CI engine.

  Discharge pressure of the compressor

What is the discharge revised discharge pressure of the compressor.

  Verify the law for parallelogram of forces

To Verify the law for parallelogram of forces, law for triangle of forces and law of polygon of forces. These laws are very useful to calculate unknown forces in very short time.

  Determine the maximum total bending moment

Determine maximum total bending moment (static plus dynamic) of the beam under steady-state conditions.

  Create a cad model of the planar robot

Create a CAD model of the planar robot

  Create a window in java

Create a window apllication in java

  Design of absorption column and the cooler

Design of absorption column and the cooler. Process design of other units should be completed along with pipe sizes.

  The Case for Global Accounting Standards

The role of IFRS in both developing and developed capital markets.

  Mechanical engineering questions

Define dynamic viscosity, Determine the centroid, Pressure due to the height of liquid, Advantage of changing the liquid, Calculate the total moment about the hinge of the seal gate.

  Wind turbine

Wind turbines are becoming more and more common as a method of energy production, wind turbines by their very nature are dynamic and are subject to and create their own internal and external kinematics and kinetics.

  Force of the water on the gate

Determine the magnitude of the horizontal and vertical components of the force of the water on the gate.

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd