
[Sponsors] 
May 17, 2020, 17:33 
How to calculate fuel consumption?

#1 
New Member
Join Date: May 2020
Posts: 16
Rep Power: 6 
I'm writing a research paper on ways to reduce aerodynamic drag on automobiles and I have a doubt.
I have managed to reduce the drag coefficient of an automobile from 0.6 to 0.48. I want to know how to calculate the fuel consumption for both the cases assuming all the other factors remains the same. Is there a direct relationship between the coefficient of drag and fuel consumption? In simple words, let the drag coefficient of a certain vehicle be 0.6 and assume I managed to reduce it to 0.5. What will be the fuel consumption for both of my cases assuming the velocity of the vehicle, density of air, rolling resistance, engine efficiency, drivetrain efficiency all remain constant. Can you please provide me with equation(s) to calculate the fuel consumption with proof so that I can cite the same on my research paper! Thank you. 

May 17, 2020, 21:08 

#2 
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,427
Rep Power: 49 
The impact of aerodynamic drag on fuel consumption depends on the ratio of aerodynamic drag to all other forms of resistance. For constant velocity on a flat surface, only rolling resistance is relevant. And of course, aerodynamic drag is proportional to velocity squared, while rolling resistances are mostly linearly proportional to velocity.
Even if you only want to make a relative statement, i.e. 10% reduced fuel consumption, you still need to know the velocity, and the type of vehicle, more precisely its rolling resistance. Large, heavy vehicles generally have a higher ratio of rolling resistance to drag, compared to lighter vehicles. 

May 18, 2020, 04:23 

#3  
New Member
Join Date: May 2020
Posts: 16
Rep Power: 6 
Quote:


Tags 
cfd, coefficient of drag, fuel 
Thread Tools  Search this Thread 
Display Modes  


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Heat transfer in fuel rod  igor_vidic  FLUENT  4  April 12, 2019 11:20 
Fuel Mass Fraction visualization  Manigandan.R  FLUENT  0  September 11, 2017 07:24 
calculate friction factor & nusselt number  soheil1991  FLUENT  3  March 11, 2017 10:30 
calculate velocity difference  helly  OpenFOAM PostProcessing  0  June 21, 2016 09:49 
How to calculate Torque for francis turbine  manish  CFX  4  March 15, 2007 03:57 