A model 110 of scale of a tractor-trailer rig is tested in

Assignment Help Mechanical Engineering
Reference no: EM13630872

A model (1/10 of scale) of a tractor-trailer rig is tested in a wind tunnel. The cross section area of the model is 0.1 m^2, the flow velocity in the wind tunnel is 75 m/s and the measured drag force is 334 N. (Note: the model length scale is 1/10 of the prototype)

1. Assuming that the drag force is a function of the cross-sectional area of the vehicle (which is the square of a length), the flow velocity, the fluid density, the fluid viscosity and the speed of sound, identify and name all the non-dimensional parameters that govern the problem.

2. Calculate the coefficient of drag assuming that the density of air is 1.25 kg/m^3.

3. Assuming that the coefficient of drag is constant, calculate the drag of the prototype for 90 km/h.

4. In order to achieve incomplete similarity, at least two non-dimensional parameters (including the coefficient of drag) need to be equal for the prototype and the model. Assuming a speed of 90 km/h for the prototype and assuming that the Reynolds numbers (prototype and model) are equal, what is the flow speed required for the model? If a flow is considered incompressible for Mach number lower than 0.2, do you think that the proposed incomplete similarity work? Why?

Reference no: EM13630872

Previous Q& A

  100kpa and 22 degc air is contained in a rigid tank of 2 m3

100kpa and 22 degc air is contained in a rigid tank of 2 m3. there is supply line connected to the tank through a

  A square plate of edge length 120 cm and negligible

a square plate of edge length 12.0 cm and negligible thickness has a total charge of 5.80 x 10-6 c. estimate the

  More heat is transferred to the air until the temperature

five kilograms of air at 300 k is contained in a vertical cylinder by a frictionless piston of a mass such that the

  A mixing chamber steadily mixes a hot water stream at

a mixing chamber steadily mixes a hot water stream at 80degc and 0.5kgs rate with a cold water stream at 20degc. if the

  A nozzle with inlet area of 800 cm2 and inlet steam

a nozzle with inlet area of 800 cm2 and inlet steam velocity is 10ms. the steam pressure is 800kpa and temperature is

  Using the classical and relativistic expressions for

using the classical and relativistic expressions for kinetic energy calculate the range of velocities for a particle of

  Knowing that the constant of eachspring is 2 knm determine

a 10-kg block is attached to spring a and connected to spring b bycord and pulley. the block is held in the position

  A heat pump with a cop of 30 is used to heat air contained

a heat pump with a cop of 3.0 is used to heat air contained in a 1205.4m3 of well-insulated rigid tank. initially the

  It is now cooled at constant volume to 200 deg c this

a system with an initial volume of 2 m is filled with water at 3 mpa 400 deg c.it is now cooled at constant volume to

  A system executes a power cycle while receiving 1050 kj by

a system executes a power cycle while receiving 1050 kj by heat transfer at a temperature of 525 k and discharging 700

Reviews

Write a Review

 

Similar Q& A

  How far below the liquid level in the tank must the pump be

a feed rate of 200gpm of a hydrocarbon mixture at 70c is being pumped from tank at 1 atm abs pressure to a distillation

  If this air conditioning system draws 5 kw of power when

an air conditioning system is used to maintain a house at 20 degrees celcius when the outside temperature is 35 degrees

  Sketch the entire process p-v diagram obtain an expression

an ideal gas undergoes two processes in a piston cylinder device from 1-2 a polvtropic compression from t1 and p1 with

  Calculate the flowrate throught this pipeline and nozzle

calculate the flowrate throught this pipeline and nozzle assuming no frictional energy losses i.e. ideal. calculate the

  Air flows steadily through an adiabatic non-ideal turbine

air flows steadily through an adiabatic non-ideal turbine entering at 150 psia 900degf and 350 fts and leaving at 20

  Isometric drawing make an isometric drawing of the v stop

make an isometric drawing of the v stop shown in figure 3. use a suitable scale to depict the ltbrgtview well on an a3

  Two blocks a and b are connected by a cord passing over two

two blocks a and b are connected by a cord passing over two pulleys c and d and e and f. at t 0 block a starts moving

  What is the magnitude of the net force

A 1300 car is traveling along a straight road at 18 . Two seconds later its speed is 21. What is the magnitude of the net force acting on the car during this time?

  Lead shot is formed by dropping molten lead through the

lead shot is formed by dropping molten lead through the center of a high tower. the frictional resistance of the air as

  Determine the number of revolution by the disk

a disk has a mass of 4kg and a radius of 90mm, it is at rest when it is placed in contact with the belt, which moves with a constat speed (v =15m/s). knowing that friction is .25 between the disk and the belt. Determine the number of revolution by..

  Calculate the change in specific internal energy and

calculate the change in specific internal energy and enthalpy of air for a process starting at 250 k and ending at 500

  The speed of the 3500-lb sports car is plotted over 30 s

the speed of the 3500-lb sports car is plotted over 30 s time period. plot the variation of the traction force f needed

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