Recent questions tagged aeronautical-engineering

Description : Tell something about differential and integral approach?

Last Answer : One may establish a big control volume to encompass the region R and calculate the overall features like drag & lift by studying what happens at the control surface. This procedure is called integral approach. Differential ... the flow at every point in a given flow field in the form P(x,y,z,t).

Description : What is finite control volume approach?

Last Answer : Consider a control volume in space drawn within a finite region of the flow. This volume is called as the control volume and the closed surface which surrounds the control volume is called as ... are applied to the fluid inside the control volume and to the fluid crossing the control surface.

Description : List the various models available for flow analysis?

Last Answer : For the analysis of a fluid element in its motion, various models are available for the purpose of study such as a) Finite control volume approach b) Infinitesimal fluid element approach c) Molecular approach

Description : What are the procedures for the development of an equation in aerodynamics?

Last Answer : a) Invoke the basic principles of fluid flow a. Mass is conserved b. Momentum is conserved, i.e. Newton‟s second law c. Energy is conserved b) Determine the suitable model of the fluid c) Apply the basic principles in the model of the fluid to obtain the mathematical equations

Description : Where should the resultant force be located on a body?

Last Answer : The resultant force should be located on the body such that it produces the same effect as the distributed loads. Resultant force should be located at a distance of center of pressure Xcp from the leading edge.

Description : What is meant by stream lining a body?

Last Answer : Streamlining is the shaping of an object, such as an aircraft body, to reduce the amount of drag or resistance to motion and increases lift through a stream of air. A curved shape allows air to flow smoothly around it. A flat shape fights air flow and causes more drag or resistance.

Description : What is critical angle of attack and what will happen when it is exceeded?

Last Answer : The angle of attack which produces the maximum lift coefficient is called as the critical angle of attack. It is also called as the "stall angle of attack". At the critical angle of attack ... becomes more and more fully separated and the airfoil produces less coefficient of lift and will stall.

Description : Define angle of attack?

Last Answer : The angle between the chord line of an airfoil and the relative wind is defined as the angle of attack.

Description : What is relative wind velocity?

Last Answer : The relative wind is the direction of movement of the atmosphere relative to an aircraft or an airfoil. It is opposite to the direction of movement of the aircraft or airfoil. The velocity at which this relative wind is flowing is called as the relative wind velocity.

Description : How the concepts of Bernoulli‟s principle differ from Archimedes principle?

Last Answer : Bernoulli‟s principle states that the increase in speed of the fluid element occurs with a decrease in pressure of the fluid. Archimedes principle states that the upward force exerted on an object immersed in a fluid is equal to the weight of the fluid displaced by the object.

Description : Explain the constituents of various gases in air and specify its proportions?

Last Answer : Air is a gas which is composed of various gases such as nitrogen, oxygen, carbondi-oxide, argon, etc. Nitrogen – 78% Oxygen – 21% Other gases – 1%

Description : Explain the important properties of international standard atmosphere?

Last Answer : International standard atmosphere is the atmospheric model of how the pressure, density and temperature of the earth‟s atmosphere vary over a wide range of altitudes It has several layers a) Troposphere b) Stratosphere c) Mesosphere d) Ionosphere e) Exosphere

Description : Enumerate the names of some notable aerodynamicists?

Last Answer : There are several aerodynamic experts who are responsible for the flight. Some of them are listed as a) Daniel Bernoulli b) Ludwig Prandtl c) George Cayley d) Theodore von Karman e) Martin Wilhelm Kutta f) Richard whitcomb g) Nicholay Zhukowsky

Description : What are the major objectives of aerodynamics?

Last Answer : a) To estimate the aerodynamic forces and moments acting on the bodies moving through the air (e.g.) lift, drag, moments on wings, fuselages, etc. b) To calculate the amount of heat transfer ... (e.g.) aerodynamic heating. c) To determine the flow moving through the air internally and externally.

Description : List the different types of aerodynamics?

Last Answer : a) Internal aerodynamics which deals about the flow of air inside the ducts (e.g.) flow through nozzles, flow in a wind tunnel, etc. b) External aerodynamics which deals about the flow around moving objects (e.g.) flow of air over an aircraft.

Description : What are the major classifications of fluid dynamics?

Last Answer : a) Hydrodynamics which deals about the movement of water. b) Gas dynamics which deals about the movement of gases. c) Aerodynamics which deals about the movement of air.

Description : Give the importance of aerodynamics in designing an aircraft?

Last Answer : a) When an aircraft is moving in air, some reactions take place in the properties of air and aerodynamics helps in studying those properties. b) Aerodynamics deals about the proper shape of the aircraft which will reduce the formation of shock waves and helps in achieving the desired Mach number.

Description : What do you mean by aerodynamics?

Last Answer : Aerodynamics is the branch of science which deals with the movement of gases especially air and its interaction with moving objects. Aerodynamics is the study of forces and resulting motion of objects through air.