[2 days left] What’s wrong with your cloud strategy? Learn why multicloud solutions matter with Nimble Storage.Register Now

x
Solved

# question in direction of flow in steady frame

Posted on 2014-02-21
Medium Priority
200 Views
I am looking at a solution of an engineering problem. There is a blast wave that moves through standard air conditions. The wave passes a stationary observer on the ground.
The problems asks to calculate mach number and direction of flow

so...
It calculates Mach 1 = 10 , Mach 2 = 0.387
then  finds u1 = 3557 , u2 = 0.38757

then it states : for stationary reference frame
V2 = u1 - u2 = 2935.1
calculates M2 = v2/a2 = 1.8270

thus V2 is directed to shock front

my question is : what is the reasoning behind this assumption that v2 is directed to shock front ?

Any input would be appreciated.
0
Question by:c_hockland
[X]
###### Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

• Help others & share knowledge
• Earn cash & points
• 2

LVL 27

Expert Comment

ID: 39877923
There are parts of the question that I do not understand.
What does Mach 1 represent?   Mach2?
Is there a difference between V2 and v2?   What is a2?
-
It seems that the problem is considering some velocity in addition to that of the shock wave. Because you said the observer is stationary, what is that other velocity?
0

Author Comment

ID: 39878110
Mach 1 is the upstream Mach  , Mach 2 is the downstream Mach .
Mach 2 = u2 / a

Mach 1 = u1 / a

hope it helps
0

LVL 27

Accepted Solution

aburr earned 2000 total points
ID: 39878174
hope it helps

some but not much. I still do not know
Is there a difference between V2 and v2?   What is a2?
and now I do not know what a is
0

## Featured Post

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A Guide to the PMT, FV, IPMT and PPMT Functions In MS Excel we have the PMT, FV, IPMT and PPMT functions, which do a fantastic job for interest rate calculations.  But what if you don't have Excel ? This article is for programmers looking to re…
Foreword (May 2015) This web page has appeared at Google.  It's definitely worth considering! https://www.google.com/about/careers/students/guide-to-technical-development.html How to Know You are Making a Difference at EE In August, 2013, one …
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…
###### Suggested Courses
Course of the Month14 days, 6 hours left to enroll