All Questions
Tagged with automotive-engineering fluid-mechanics
17
questions
2
votes
2
answers
60
views
Two Definitions of Kinematic Viscosity and it's Importance in Engine Oils
I have come across two definitions of kinematic viscosity and I am wondering about their relationship and significance in engine oils.
One definition describes kinematic viscosity as momentum ...
- 395
0
votes
0
answers
38
views
How (mathematically) does pressure in the intake manifold vary based on size of throttle opening?
I have the intuitive picture somewhat down: the intake manifold is partially opened; during the intake stroke of a four-stroke process, the piston moves rapidly moves downwards creating a short-term ...
- 101
0
votes
2
answers
157
views
What are the benefits of reducing valve duration in an engine?
From my understanding this would be beneficial if you've taken a stock engine and put a smaller, more restrictive air intake on it.
It would also be done to create more low end torque which shifts the ...
- 91
2
votes
2
answers
758
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How to use excel spreadsheet formulas to find optimal camshaft profile [closed]
I have a 600cc 4 cylinder Honda engine that my race car team uses.
The rules of the race mandate that we install an intake that is substantially smaller than the stock factory intake size to limit ...
- 91
1
vote
1
answer
70
views
What is basic knowledge wanted from a bachelor mechanical engineering student before joining? [closed]
At the moment, I just finished my senior school year and in a few months, I will be studying mechanical engineering as bachelor degree. However, I don’t like to waste my time and want to use this time ...
- 11
2
votes
1
answer
3k
views
Throttle vs Choke vs Damper vs Valve?
Throttles, chokes, dampers, and valves all restrict fluid flow. Aside from specific terminology/usage in internal combustion engines, are these really interchangeable terms, or do they have some ...
- 170
-1
votes
1
answer
465
views
Relation between Inlet and Outlet mass flow rate for a turbocharger?
For the compressor maps for automotive turbochargers, the Corrected mass flow rate (at inlet) is given as abscissa. However, I wish to know the mass flow rate at the outlet. What is the relation in ...
0
votes
1
answer
92
views
Complete Similarities
Regarding the similarities, I know that the complete similarity is not always possible because all geometric, kinematic, dynamic similarity can not be met simultaneously.
Is it because both ...
- 111
1
vote
4
answers
936
views
How can I connect F=ma to Drag=1/2*Cd*(rho)*V^2*A?
I previously posted a different question that was very vague. I have kept working on the problem, and now I have a different question. Please let me know if I should have just added it to the old ...
- 11
2
votes
0
answers
32
views
Is there some temperature at which all "5w" oils should have about the same viscosity?
Is there some temperature at which all "5w" motor oils should have about the same viscosity? (5w-20, 5w-30, 5w-40, 5w-50, etc.)
I am looking for SAE or ASTM wording or chart that says it straight ...
- 21
1
vote
3
answers
1k
views
How do drag and downforce in a rear spoiler of a car vary with angle of attack?
I ran an two aerodynamic simulations, one for a spoiler angle of 0 deg and the other for the same spoiler declined at 30 deg. The results showed a considerable increase in downforce, but only a slight ...
2
votes
3
answers
626
views
Smoothed Particle Hydrodynamics (SPH) Vs. Large Eddy Simulation (LES) for Gearboxes
In the not too distant future I will be looking to simulate lubricant oil flows in a gear box, with rotating gears located in a bath of oil. I will be looking at the distributions at various angles of ...
- 508
0
votes
2
answers
135
views
Can you use the kinetic energy of air to power a car?
In my fluid mechanics class, I've learned that a fluid traveling in a pipe will generate a force when the exit area is smaller then the entrance area. Suppose a pipe is attached to a car that will use ...
8
votes
5
answers
5k
views
Torque converter torque multiplication
I keep reading all over the internet that a torque converter multiplies torque at stall speed. Every explanation I have found sounded more like hand-waving than quantitative physical explanation. ...
- 181
1
vote
2
answers
851
views
What is the meaning of 'clutch fill'?
What is the meaning of clutch fill?
See for example this paper.
- 540