I joined Professor Dr. Md. Mashud’s CFD group and started developing my skill on the application of ANSYS Fluent and OpenFOAM as simulation tools. Finally, I decided to use ANSYS Fluent for my research work on “Numerical Study of Flow Past a Marine Rudder”. During my research, I faced the problem with the stall angle at around 16 degree angle of attack of the flow. At this angle of attack of the flow, the increase of lift force on NACA 0012 airfoil section stopped suddenly and after that, lift force just plummeted. I started brainstorming to increase the stall angle so that the rudder section can work beyond its present capacity. Finally, I came up with the idea to use fish wedge or tail wedge section invented by S. F. Hoerner for solving the problem. Using this concept in my study, I solved the problem and made the airfoil section, 15% more efficient from the view of lift force with negligible increase in drag force generation. I have worked an entire year on my research work, but the PC in the computer lab, in which I was working, crashed just a few days before my final presentation. I lost almost everything. I was shocked, but not vanquished and started working vigorously and after several days of arduous work I managed to build the complete thesis again from the scratch…
model that is typically used for sizing by traditional methods. The wing box odel mainly consists of Shell and Beam elements representing skin and stringers/stiffeners, respectively. The whole wing model with its major substructures (centre, inner and outer wing) is given in Fig. 4. Combining wing box with fuselage and empennage FE models results in a WAM of approximately 250,000 degrees of freedom. A finite element model common to the stress, aero elastics and the MDO group is used. This FE…
1.1 What is aerofoil?
Aerofoil is a large stucture which is attached to the airplane. It has curved surfaces designed to give required ratio of lift and drag. It helps to create different aeodynamic forces. The force perpendicular to the motion of aeofoil is lift force. The force parallel to the motion of aerofoil is drag force.
1.2 How it works?
Aerofoil consists of following components:
• Suction surface
• Pressure surface
• Leading edge
• Tailing edge
This is achieved by placing the wing at an angle of yaw which such that the component Mach number normal to its long axis be subsonic.
M⊥ = M∞ cos β
Where β is angle of sweep.
Let us assume that the critical “drag divergence” mach number of the wing section is 0.7, then the angle of yaw must be such as to reduce the component Mach number to this value. For M-1.0 the angle of yaw required is then 45 deg.
2.3.2 Increased extension of the wing in the flight direction
One of the major advantage…
Degenerate Cases of Conic Sections:
Conics are formed when a plane and a double cone intersect. These intersections can form a variety of conics. These include: circles, parabolas, ellipses and hyperbolas. A circle can be formed from a cone if a plane intersects with the cone at an angle perpendicular to the base of the cone. This circle is also formed by the equation: (x-h)2+ (y-k)2=r2. This equation creates a relation because the collection of points does not pass the vertical line test. To…
The question for this experiment is, Does the angle of an airplane wing affect the average rate of descent of the plane while gliding? So, the thing that is being tested is if the angle of an airplane wing, which determines the average rate of descent. In this experiment, the average rate of descent will be found by dividing the distance the plane traveled by the time it took the plane to land.
First, how planes fly needs to be understood. Airplanes fly because the wings…
Pattern: Falling velocity and the dispersal ability of a glider seed varies with its surface area.
• Hypothesis 1: Increase in surface area of the seeds decreases their falling velocity, due to greater air resistance
o Prediction: Seeds with the higher surface area will have a decreased falling velocity.
o Reasoning: The greater the surface area of a seed, the more air resistance it experiences and thereby slowing its fall.
Analytical Approach: scatterplot,…
in the equation, some values include:
Shape/Object Drag Coefficient
Thin Disk 1.1
Speed: Similar to surface it is also included in the equation and is directly proportional to Drag force.
Fluid Density: Increased density means an increase in mass, which increases resistance to the object that is passing through it.
Properties of the Fluid: Compressibility and Viscosity; as the object passes through a certain material the matter will be…
reduce drag from uncoordinated flight, the manual yaw trimmed was used.
6). The Pilot Incorrectly Handled the Aircraft at Takeoff.
The F-16 flight manual is not a “how to” manual. Pilot experience is recognized; therefore, basic flight principles are avoided. The F-16 flight manual and checks are written and prepared to be understandable to the least experienced pilot who could be expected to operate the F-16.
The basic flight characteristics of the F-16 while slow and with high angles of…
To understand aircraft propulsion it is important to understand the term propulsion first.
Propulsion is a means of producing force required for movement of object. The propulsion system has some source of mechanical power and some means of using this power to generate force such as wheels, propellers, legs, etc.
Nobody can precisely tell the origin of mankind’s desire to fly as it is lost in the distant past. There are legends of people strapping birdlike wings and jumping of a…