The aerodynamic drag of a new sports car is to be predicted at a speed of 75 km/h at an air temperature of 25°C. Automot...
The aerodynamic drag of a new sports car is to be predicted at a speed of 75 km/h at an air temperature of 25°C. Automotive engineers build a one-fifth scale model of the car to test in a wind tunnel. It is winter and the wind tunnel is located in an unheated building. The temperature of the wind tunnel air is only 5°C.
a) Determine how fast the engineers should run the wind tunnel in order to achieve similarity between the model and the prototype.
b) If the drag force on the model is 40 N, predict the drag force on the full-size car.
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The aerodynamic drag of a new sports car is to be predicted at a speed of 75 km/h at an air temperature of 25°C. Automot...
Problem 7-C: The aerodynamic drag of a new sports car is to be predicted at a...
Problem 7-C: The aerodynamic drag of a new sports car is to be predicted at a speed of 70.0 mi/h at an air temperature of 25°C. Automotive engineers build a one-fourth 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...
Automotive engineers plan to build a one-third scale model of a sports car and test it...
Automotive engineers plan to build a one-third scale model of a sports car and test it in a wind tunnel. The temperature of the wind tunnel is at 25°C. The drag force is measured with a drag balance and the moving belt is used to simulate the moving ground. If the sports car runs at 25°C, Wind tunnel test section L Fom Moving belt Drag balance Figure 4 Question 4 a) Propose the speed of the car that can be...
The aerodynamic characteristics of a new car are to be predicted through a wind tunnel testing....
The aerodynamic characteristics of a new car are to be predicted through a wind tunnel testing. Engineers build a one-fifth scale model of the car and placed it in the test section of the wind tunnel. The measured flow properties are given as Modet T+5°C, ?-1269kg/m 3 , ?-1.754 x 10-5 kg/m.s Prototype: T 25°C,p:1184 kg/m, ?#1.849 x 10-5 kg/mS, If the dimensional analysis results are outline as follows: V-50km/h Where, aerodynamic drag force, ? = density, V = speed,...
HELP ME URGENT! Automotive engineers plan to build a one-third scale model of a sports car...
HELP ME URGENT! Automotive engineers plan to build a one-third scale model of a sports car and test it in a wind tunnel. The temperature of the wind tunnel is at 25°C. The drag force is measured with a drag balance and the moving belt is used to simulate the moving ground. If the sports car runs at 25°C, Wind tunnel test section Vm Pmi Hm Lm Fo.m Moving belt Drag balance Figure 4 Question 4 Propose the speed of...
A one-third scale model of a car is to be tested in a wind tunnel. The...
A one-third scale model of a car is to be tested in a wind tunnel. The conditions of the actual car are v = 75 km/h and I = 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 velocity should be The properties of air at 1 atm and 0°C: mass density (p) = 1.292 kg/m3, kinematic viscosity (V) = 1.338x10-5 m2/5 The properties...
The drag coefficient of a car at the design conditions of 1 atm, 25°C, and 90...
The drag coefficient of a car at the design conditions of 1 atm, 25°C, and 90 km/h is to be determined experimentally in a large wind tunnel in a full-scale test. The height and width of the car are 1.25 m and 1.65 m, respectively. If the horizontal force acting on the car is measured to be 300 N, determine the total drag coefficient of this car. Take the density of air at 1 atm and 25°C as p 1164...
The drag coefficient of a car is to be determined experimentally with a full scaleWind tunnel...
The drag coefficient of a car is to be determined experimentally with a full scaleWind tunnel test in a large wind tunnel. The wind speed is60 mih 00 km/h (60 mi/h) and the drag force measured on a scale as shown in the adjacent drawing is 302 N (68 lbf). The frontal area of the car is 2.068 m2 (22.26 ft2) Neglect any ground effect due to the floor not moving relative to the car (a) Calculate the drag coefficient...
Wind Chill 50 45 40 35 30 Wind Speed (km/h) 25 20 15 10 5 0...
Wind Chill 50 45 40 35 30 Wind Speed (km/h) 25 20 15 10 5 0 in -10 -15 -20 35 40 -45 -50 Air Temperature (°C) Task: The wind chill index measures the sensation of cold on the human skin. In October 2001, Environment Canada introduced the wind chill index above. Each curve represents the combination of air temperature and wind speed that would produce the given wind chill value. For example, a temperature of -25°C and wind speed...
Encircle the correct answer for the following questions: • What is the hydraulic diameter of a...
Encircle the correct answer for the following questions: • What is the hydraulic diameter of a rectangular air ventilation duet whose cross section is 1 m by 25 cm? (a) 25 cm (b) 40 cm (c) 100 cm (d) 75 cm (e) 50 cm Oil = 0.1kg/ms, specific gravity= 0.9] flows through a 50-m-long smooth 8-cm-diameter pipe. The maximum pressure drop for which laminar flow is expected is approximately • • (a) 40 kPa (b) 50 kPa (c) 60 kPa...
Problem 7-C: The aerodynamic drag of a new sports car is to be predicted at a speed of 70.0 mi/h at an air temperature of 25°C. Automotive engineers build a one-fourth 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...
Automotive engineers plan to build a one-third scale model of a sports car and test it in a wind tunnel. The temperature of the wind tunnel is at 25°C. The drag force is measured with a drag balance and the moving belt is used to simulate the moving ground. If the sports car runs at 25°C, Wind tunnel test section L Fom Moving belt Drag balance Figure 4 Question 4 a) Propose the speed of the car that can be...
The aerodynamic characteristics of a new car are to be predicted through a wind tunnel testing. Engineers build a one-fifth scale model of the car and placed it in the test section of the wind tunnel. The measured flow properties are given as Modet T+5°C, ?-1269kg/m 3 , ?-1.754 x 10-5 kg/m.s Prototype: T 25°C,p:1184 kg/m, ?#1.849 x 10-5 kg/mS, If the dimensional analysis results are outline as follows: V-50km/h Where, aerodynamic drag force, ? = density, V = speed,...
HELP ME URGENT! Automotive engineers plan to build a one-third scale model of a sports car and test it in a wind tunnel. The temperature of the wind tunnel is at 25°C. The drag force is measured with a drag balance and the moving belt is used to simulate the moving ground. If the sports car runs at 25°C, Wind tunnel test section Vm Pmi Hm Lm Fo.m Moving belt Drag balance Figure 4 Question 4 Propose the speed of...
A one-third scale model of a car is to be tested in a wind tunnel. The conditions of the actual car are v = 75 km/h and I = 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 velocity should be The properties of air at 1 atm and 0°C: mass density (p) = 1.292 kg/m3, kinematic viscosity (V) = 1.338x10-5 m2/5 The properties...
The drag coefficient of a car at the design conditions of 1 atm, 25°C, and 90 km/h is to be determined experimentally in a large wind tunnel in a full-scale test. The height and width of the car are 1.25 m and 1.65 m, respectively. If the horizontal force acting on the car is measured to be 300 N, determine the total drag coefficient of this car. Take the density of air at 1 atm and 25°C as p 1164...
The drag coefficient of a car is to be determined experimentally with a full scaleWind tunnel test in a large wind tunnel. The wind speed is60 mih 00 km/h (60 mi/h) and the drag force measured on a scale as shown in the adjacent drawing is 302 N (68 lbf). The frontal area of the car is 2.068 m2 (22.26 ft2) Neglect any ground effect due to the floor not moving relative to the car (a) Calculate the drag coefficient...
Wind Chill 50 45 40 35 30 Wind Speed (km/h) 25 20 15 10 5 0 in -10 -15 -20 35 40 -45 -50 Air Temperature (°C) Task: The wind chill index measures the sensation of cold on the human skin. In October 2001, Environment Canada introduced the wind chill index above. Each curve represents the combination of air temperature and wind speed that would produce the given wind chill value. For example, a temperature of -25°C and wind speed...
Encircle the correct answer for the following questions: • What is the hydraulic diameter of a rectangular air ventilation duet whose cross section is 1 m by 25 cm? (a) 25 cm (b) 40 cm (c) 100 cm (d) 75 cm (e) 50 cm Oil = 0.1kg/ms, specific gravity= 0.9] flows through a 50-m-long smooth 8-cm-diameter pipe. The maximum pressure drop for which laminar flow is expected is approximately • • (a) 40 kPa (b) 50 kPa (c) 60 kPa...
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