Let's say you want to predict the aerodynamic drag of a new car based on the use of a model that is one- fifth scale of the actual car/prototype car. We want to predict the drag of the car when it has wind velocity 75 miles/hour with an air temperature of 40°C. The model is placed in a wind tunnel at 10°C. Determine the wind tunnel velocity necessary to achieve similarity between the model and the prototype.
Q: The COP of a reversible heat pump increases as the temperature of the heated room increases. (True…
A: c)The COP of reversible heat pump increases as the temperature of the heated room…
Q: e high-pressure turbine at 10 MPa and 500°C enser as a saturated liquid at a pressure of 1 hermal…
A: The net power output is .The steam enters the high-pressure turbine at .The steam enters the…
Q: m1, VI 0 m₂V₁cos e-m₂V2 - m3V3 + F₁ System boundary = FIGURE 7.27 A jet impinging on a surface not…
A:
Q: 3/200 Determine the coefficient of restitution e for a steel ball dropped from rest at a height h…
A:
Q: A mass of 4 kilograms is attached to the end of a spring. A force of 8 N stretches the spring 80 cm.…
A:
Q: pressed liquid water enter poiler at 500°C, 3000 kPa
A: Write the value of enthalpy from the steam table as follows-
Q: Develop a mathematical model of the performance of a plastic bonding process given the process data…
A: It is asked to generate a mathematical model to represent the table above
Q: Question No. 1: A 1.2 m boom is held by a ball-and-socket joint at C and by two cables BF and DAE;…
A: DAE passes through frictionless pulley at A
Q: 2 Problem Consider a box, with an initial velocity vo, that slides up a ramp with angle 0, as shown…
A:
Q: 25mm 150mm Ł 20mm 200mm 20mm Figure 1: Cross section The beam is made from three sections welded…
A: sectional properties :Location of N.A from the top;moment of inertia about the N.ABending…
Q: A 150-g model rocket is fired vertically. The engine applies a thrust P which varies in magnitude as…
A: Given:To find:Time for the rocket to reach its maximum elevation.
Q: 3.6.45 (WP) Oil of specific gravity 0.83 flows in the pipe shown in Fig. P3.6.45. If viscous effects…
A:
Q: Gauge Absolute Pressure, P Pressure (kPa) (KPA) Steam Temperature, T-K Increasing P| Decreasing P…
A: Saturation Temperature:The saturation temperature is the temperature at which a pure substance (like…
Q: A precast concrete wall section is temporarily held by two cables as shown. Knowing that t cable BD…
A: Find the position coordinates for the points B and DThe position vector of BDThe position vector…
Q: A pump is being installed to circulate water through a piping system in an industrial plant. The…
A:
Q: 1 in. 100 4 in. y
A:
Q: The brake piston consists of a full cecular part. Its cross section is shown in ( Eigure 1). Suppose…
A: Cross-section:a=18 mmb=80 mmc=55 mmd=35 mme=30 mmf=45 mmTo determine: interior surface area of brake…
Q: Q8. A shaft shown in Figure below, with an cylindrical mass weighing 10 N. Find the natural…
A: Given data:Weight of the object, W = 10 Nl1 = 12 cm = 0.12 ml2 = 10 cm = 0.1 m l3 = 8 cm = 0.08 mE1…
Q: 3. Draw the projections of a regular hexagon of 20 mm side, having one of its sides in the H.P. and…
A: Object: Regular HexagonDimensions: 20 mm diameterCondition: One side in H.P
Q: Your least favorite professor likes mountain climbing and plans to do some during Winter Break.…
A: Given:To find:When would the real professor reappear?
Q: Determine the sum of the moments created by the forces shown in the accompanying figure about point…
A: Determine the sum of the moments created by the forces shown in the accompanying figure about point…
Q: e whether the flow is rotational or irrotational using an expression for the vorticity of the flow…
A: The key difference between rotational flow and irrotational flow lies in the presence or absence of…
Q: Problem 2-Refrigeration ( After returning from the store you place 4 bottles of water, 3 kg each, in…
A:
Q: An air parcel at 950 mb has a temperature of 14°C and a mixing ratio of 8 g/kg. What is the wet-bulb…
A:
Q: A pump is being installed to circulate water through a piping system in an industrial plant. The…
A:
Q: Figure 2 shows a built-up cross-section of a horizontal beam which has a maximum shear force of 100…
A:
Q: Water flows through an orifice in the bottom of the tank shown. If the tank water away from the…
A:
Q: This is wrong
A: Given data:For air standard diesel cycle, we haveCompression ratio = r = 16Cut off ratio = At the…
Q: Identify the GD&T applicable for the following component assembly. Make a table including Tolerance…
A: Given:To find:Identify the geometric dimensioning and tolerancing (GD&T) applicable.
Q: The center of mass G of a high jumper follows the trajectory shown. Determine the component vo,…
A:
Q: For the stress shown below, determine the cross-sectional areas of bars BE, BF and CF so that the…
A: For the stress shown below,Determine the cross-sectional areas of bars BE, BF and CF so that the…
Q: Relative to the x-, y-, and z-axes, the state of stress at a point in a component is found to be…
A: Given- To Find-(a) The normal, shear, and resultant stresses that act on a plane whose normal…
Q: Draw the Shear force and Bending moment diagrams
A: Draw the Shear force and Bending moment diagrams.
Q: -1-60 in. and L2= ne the maximum shear stresses T₁, ne the rotation angle DA of gear i in.,…
A: The power supply by the motor is The speed of the motor is The diameter of shafts 1 and 2 is The…
Q: Determine the tensions in cables AB, AC, and AD.
A: According to the given datam=105kgCo-ordinates of the pointA=(0 ,0 , -2.2)mB=(-1.30 , 0.55 , 0)C=(0…
Q: 1. Fill in the missing spaces and determine the direction of from in Pipe D. C Pipe Flow (ft³/sec))…
A: Fill in the missing spaces and determine the direction of from in Pipe D.
Q: NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to…
A:
Q: QUESTION 1 The economiser of a steam boiler receives its feed water at 34.6°C and supplies the…
A:
Q: 3.6.70 WP Water, considered an inviscid, incompressible fluid, flows steadily, as shown in Fig.…
A:
Q: What are rigid body equations of equilibrium?
A: We have to write the equation of equilibrium for a rigid body
Q: The stresses at a given point in a stressed body relative to rectangular axes are a=20, dy=-40, 0₂ =…
A: Given stress components:The angles according to x,y, and z-axis is given as:
Q: this is wrong
A: Given:Find:The work required by the compressor i.e. work input to the compressor in kJ/kg
Q: 3.5 Consider the nonlinear equation U where u is a constant. a. Is this equation in conservative…
A: The following equation is not conservative since it includes both the variable's derivative term and…
Q: An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air…
A:
Q: Problem 2 A window air conditioner consumes 0.8 kW of electricity during steady-state operation. If…
A:
Q: Explain the following, using dislocation theory: metal strengthening by: (a) grain size (b) solid…
A: Dislocation theory plays a crucial role in understanding various mechanisms of metal strengthening.…
Q: d tank is 20 meters off the ground and the tank has a gauge pressure of 5 bar. Ignoring frictional…
A:
Q: Using masons rule find the transfer function G(s) = C(s)/R(s)
A: Given:To find:Transfer function.
Q: An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning…
A: Find out:The mean effective pressure
Q: A mass that weighs 8 lb stretches a spring 24 inches. The system is acted on by an external force of…
A:
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 3 images
- (b) A wind-tunnel experiment is performed on a small 1:5 linear-scale model of a car, in order to assess the drag force F on a new full-size car design. A dimensionless "drag coefficient" Ca is defined by C, =- pu'A where A is the maximum cross-sectional area of the car in the flow. With the model car, a force of 3 N was recorded at a flow velocity u of 6 m s. Assuming that flow conditions are comparable (i.e., at the same Reynolds number), calculate the expected drag force for the full-sized car when the flow velocity past it is 31 m s (equivalent to 70 miles per hour). [The density of air p= 1.2 kg m.]The aerodynamic drag of a new sports car is to be predicted at a speed of 60.0 mi/h at an air temperature of 25°C. Automotive engineers build a one-third scale model of the car to test in a wind tunnel. The temperature of the wind tunnel air is also 25°C. The drag force is measured with a drag balance, and the moving belt is used to simulate the moving ground (from the car’s frame of reference). Determine how fast the engineers should run the wind tunnel to achieve similarity between the model and the prototype.The aerodynamic drag of a new sports car is to be predicted at a speed of 60 mph at an air temperature of 25°C. Automotive engineers build a one-third scale model of a car to test in a wind tunnel, shown in the figure below. The temperature of the wind tunnel air is also 25°C. The drag force is measured with a drag balance, and the moving belt is used to simulate the moving ground (from the car's frame of reference). The aerodynamic drag on the model in the wind tunnel is measured to be 34.5 lbf when the wind tunnel is operated at the speed that ensures similarity with the prototype car. Estimate the drag force (in lbf) on the prototype car at the given conditions. For air at T = 25°C and atmospheric pressure, p=1.184 kg/m3 and u-1.849-10-5 kg/m-s. Wind tunnel test section Pm Pm Fo.m Moving belt Drag balance The drag force on the prototype car is estimated to be Ibf.
- The drag on a 2-m-diameter satellite dish due to an 69-km/hr wind is to be determined through a wind tunnel test using a geometrically similar 0.4-m-diameter model dish. Assume standard air for both model and prototype. (a) At what air speed should the model test be run? (b) With all similarity conditions satisfied, the measured drag on the model was determined to be 152 N. What is the predicted drag on the prototype dish? (a) Vm = (b) D = i i km/hr Nusing pure water at 20°C. The velocity of the prototype in seawater (p = A 1/18 scale model of the submarine is to be tested in the water tunnel 1015 kg/m³, v = 1.4x106 m²/s) is 3 m/s. Determine: a) the speed of the water in the water tunnel for dynamic similarity D) the ratio of the drag force on the model to the drag force on the prototype(c) If a drag force of 214 N is measured o wind tunnel, a 1:20 scale model is created and tested at the same air temperature in order to determine the drag. A blimp typically flies at 20 m/s in air at standard conditions. In order to model the blimp's behavior in a LOAD (a) What is the AMO At a model velocity of 75 m/s, what is the appropriate air pressure in the wind tunnel? DO dimensionless parameter to use so that dynamic similarity is maintained? DO prototype be? CHE CHEGO EXAM yOT UPL OT on the model, what would the corresponding drag on the UPZ EXAM EXAM NOT U 20 NOT TO CHEC DAD
- A student team is to design a human-powered submarine for a design competition. The overall length of the prototype submarine is 95 (m), and its student designers hope that it can travel fully submerged through water at 0.440 m/s. The water is freshwater (a lake) at T = 15°C. The design team builds a one-fifth scale model to test in their university’s wind tunnel. A shield surrounds the drag balance strut so that the aerodynamic drag of the strut itself does not influence the measured drag. The air in the wind tunnel is at 25°C and at one standard atmosphere pressure. At what air speed do they need to run the wind tunnel in order to achievesimilarity?3. In the study of aerodynamic drag on a stationary body, an appropriate non-dimensional grouping has been found to be: QAU3 where, P is the power lost, p is the density of the fluid, A is a typical area, and U is the velocity of the fluid. In laboratory tests with a 1:10 scale model (ratio of the length) at 25°C, the power lost was measured as 5 w when the air velocity was 0.5 m/s. Calculate the power lost in the prototype (kW) at 25°C when the air velocity is 1 m/s.A 1:4 scale torpedo model has been built. The prototype is expected to move at a speed of 6m/s in water at 15°C. What should be the velocity in the model if, a) the test is done in a stream channel at 15°C; and b) the test is done in a wind tunnel at 27°C and a pressure of 20 atm?
- Question 3 The aerodynamic derivative X, may be determined from the following expression: X -pU SCD %3D where p is the air density, S is the wing area, U is the airspeed, and Cp is the drag coefficient. Consider an aircraft of weight 68 kN and wing area 43 m?, flying straight and level under international standard atmosphere (ISA) conditions, where p 1.018 kg/m, at an airspeed of 155 m/s. The aircraft %3D has a drag polar Cp = 0.011 + where Ci is the lift coefficient. Calculate the value of X, at this flight condition. Give your answer in units of Ns/m.(COLLAB) Simulate projectile motion with air resistance in PhysLab. A shuttlecock is launched from the ground with an initial speed of 36.9688 m/s at an angle of 6.8583 degrees with respect to the horizontal. The shuttlecock experiences air resistance with a drag coefficient of 0.1931 in an environment where the air density is 0.9453 kg/m3. If the shuttlecock has a radius of 3.4 cm and a mass of 5.2 grams, what is the maximum height reached by the shuttlecock? Assume that the experiment is done near the surface of the earth (initHeight = 0) .A one-fourth scale model of a car is to be tested in a wind tunnel. The conditions of the actual car are V = 45 km/h and T = 0°C and the air temperature in the wind tunnel is 20°C. In order to achieve similarity between the model and the prototype, the wind tunnel is run at 180 km/h. The properties of air at 1 atm and 0°C: ? = 1.292 kg/m3, ? = 1.338 × 10−5 m2/s. The properties of air at 1 atm and 20°C: ? = 1.204 kg/m3, ? = 1.516 × 10−5 m2/s. If the average drag force on the model is measured to be 70 N, the drag force on the prototype is (a) 66.5 N (b) 70 N (c) 75.1 N (d ) 80.6 N (e) 90 N