1
ME 525
SP2011
Exam #2
Questions and Answers
Exam Date April 7, 2011
Prof. Lucht (Email address:
[email protected])
Question:
Is there a signerror on the equation sheet attached to old exam 2?
On page ten the
equation for mdot "i,f = (rho)(Yi)(vi,diff)
should the negative actually be there?
The solution shown in the problem does not have the negative, and neither does the lecture notes.
Answer:
You are correct, that is a sign error.
I will correct it.
Note:
I may not be able to
correct it for the distance students, I have already handed the exam in to ProEd.
Question:
I have been going through and trying to make sure I understand the mixture fraction
concept. When finding f_stoichiometric, I have found that I can work either on the reactant side
or the product side to find the mixture fraction. If I work on the reactant side, f_stoichiometric =
Y_fuel (where Y_fuel is the fuel mass fraction). This however, does not seem to be the case if
the combustion is not stioichiometric, instead I must work with the product side. Why is this the
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This note was uploaded on 12/27/2011 for the course ME 525 taught by Professor Lucth during the Fall '11 term at Purdue.
 Fall '11
 Lucth

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