CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

How to calculate fuel consumption?

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 17, 2020, 17:33
Post How to calculate fuel consumption?
  #1
New Member
 
Join Date: May 2020
Posts: 16
Rep Power: 6
Nishanth is on a distinguished road
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 co-efficient 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.
Nishanth is offline   Reply With Quote

Old   May 17, 2020, 21:08
Default
  #2
Super Moderator
 
flotus1's Avatar
 
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,427
Rep Power: 49
flotus1 has a spectacular aura aboutflotus1 has a spectacular aura about
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.
flotus1 is offline   Reply With Quote

Old   May 18, 2020, 04:23
Post
  #3
New Member
 
Join Date: May 2020
Posts: 16
Rep Power: 6
Nishanth is on a distinguished road
Quote:
Originally Posted by flotus1 View Post
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.
Let's say my co-efficient of rolling resistance is 0.006 and the vehicle is moving with a constant velocity 80 Km/h (22.22m/s). Now, what is my fuel consumption?
Nishanth is offline   Reply With Quote

Reply

Tags
cfd, coefficient of drag, fuel

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


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 Post-Processing 0 June 21, 2016 09:49
How to calculate Torque for francis turbine manish CFX 4 March 15, 2007 03:57


All times are GMT -4. The time now is 06:24.