In flow over bluff bodies such as a cylinder, how does the pressure drag differ from the friction drag?
Q: During a high Reynolds number experiment, the total drag force acting on a spherical body of…
A: Given data, From stokes equation,
Q: How important is the study of aerodynamics in designing an aircraft and the effect on performance
A: How important is the study of aerodynamics in designing an aircraft and the effect on performance?
Q: By which part of the Aircraft is mainly produced the "Induced drag" ??
A: Lift causes induced drag, which is unavoidable.
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Q: During a winter day, wind at 55 km/h, 5°C, and 1 atm is blowing parallel to a 4-m-high and 10-m-long…
A: Given data velocity of wind 55 km/hr = 15.27 m/sec height of the wall h = 4m length of the wall L =…
Q: Еxample 2 During a high Reynolds number experiment, the total drag force acting on a spherical body…
A: The friction drag coefficient of the sphere is CD,friction = 0.0115.
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A: Before solving we have to make some assumptions as follows: The flow of air is steady and…
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Q: During a winter day, wind at 58 km/h, 5°C, and 1 atm is blowing parallel to a 3.5-m-high and…
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Q: What effect does increasing the Reynolds number have on coefficient of lift and drag?
A: we know that Reynolds no. is defined as the ratio between flow inertia and viscosity.
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Q: ler angles of attack, which is associated wi Diffuser effect Дифузорно течение O a decrease in Lift…
A: Solution ;
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Q: What is flow separation? What causes it? What is the effect of flow separation on the drag…
A: Flow separation It is a process in which the boundary layer of the fluid detaches itself from the…
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A: The related diagram is given as, The density of air is written as, The dynamic viscosity at 5 oC…
Q: 1. Consider an light plane aircraft with a characteristic of: Wing area = 181 ft2 Aspect ratio =…
A: Solution: Given Data: A=181 ft2AR=6.2ηo=0.91W=3000 lbCD,o=0.027Pmax=345 hpηp=0.83V∞=100 ft/s Note:…
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Q: What is necessary to increase the Lift to Drag ratio and its Maximum value?
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Q: What is the difference between streamlined and bluff bodies? Is a tennis ball a streamlined or bluff…
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A: Given question? What is induced drag on wing? Can it be minimized by wing shape?
In flow over bluff bodies such as a cylinder, how
does the pressure drag differ from the friction drag?
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- What is the effect of streamlining on (a) friction drag and (b) pressure drag? Does the total drag acting on a body necessarily decrease as a result of streamlining? Explain.During a winter day, wind at 70 km/h, 5°C, and 1 atm is blowing parallel to a 4-m-high and 15-m-long wall of a house. Approximating the wall surfaces as smooth, determine the friction drag acting on the wall. What would your answer be if the wind velocity has doubled? How realistic is it to treat the flow over side wall surfaces as flow over a flat plate?Air at 20°C and with I Bar Pressure is flowing over a flat plate at a velocity of 2.801 m/s. If the plate is 27.5 cm wide and at 60°C, calculate the value of Boundary layer thickness, Average friction coefficient, Shear stress due to friction, Local convective heat transfer coefficient, Average heat transfer coefficient, Rate of heat transfer by convection and Total Drag on the plate.The properties at 40°C are:Density: 1.1298 kg/m³, cp= 1.004 kJ/kg C, k- 0.02774 w/m'C, Kinematic viscosity is 17.13 x 10°
- What is flow separation? What causes it? What is the effect of flow separation on the drag coefficient?Atmospheric air is in parallel flow (u∞ = 10 m/s, T = 15°C) over a flat heater surface that is to be maintained at a temperature of 90°C. The heater surface area is 0.25 m², and the airflow is known to induce a drag force of 0.17 N on the heater. What is the electrical power, in kW, needed to maintain the prescribed surface temperature? Use the modified Reynolds or Chilton-Colburn analogy. Evaluate properties for the air at 325 K. q= i kWWhat fluid property is responsible for the development of the velocity boundary layer? What is the effect of the velocity on the thickness of the boundary layer?
- During a high Reynolds number experiment, the total drag force acting on a spherical body of diameter D = 11 cm subjected to airflow at 1 atm and 5°C is measured to be 5.0 N. The pressure drag acting on the body is calculated by integrating the pressure distribution (measured by the use of pressure sensors throughout the surface) to be 4.75 N. Determine the friction drag coefficient of the sphere.Thrust is required to propel an airplane at a fi nite forwardvelocity. Does this imply an energy loss to the system?Explain the concepts of thrust and drag in terms of the fi rstlaw of thermodynamics.From Table the drag coefficient of a wide plate normalto a stream is approximately 2.0. Let the stream conditionsbe U∞ and p∞. If the average pressure on the front of theplate is approximately equal to the free-stream stagnationpressure, what is the average pressure on the rear?
- Based strictly on your understanding of the flat-plate theoryplus adverse and favorable pressure gradients, explainthe direction (left or right) for which airflow past theslender airfoil shape in Fig will have lower total(friction 1 pressure) drag.Еxample 5 The total mass, wing area, cruising speed, and air resistance power of a small aircraft are 1800 kg, 42 m², 280 km/hr, and 190 kW, respectively. Determine the lift and drag coefficients of this airplane while cruising at an altitude of 4000 m.11 4URITAL (B) Air at 27°C flows over a flat plate with a velocity of 3 m/s. Calculate the boundary layer thickness (8) at a distance 25 cm from the leading edge of the plate. The physical properties of air are: p=1.17 kg/m³ and -1.85x10 m³/s. 4.64 TE Re