If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
dynamic pressure on the nose of aircraft?
I am preparing for a exam and in one of the question papers,
there was a question Q) What is the dynamic pressure an the nose of aircraft? Maximum or minimum or zero. in the book the ans. is given as zero,but I doubt that could be printing mistake. I think the answer shuld be maximum dynamic pressure at the nose. please correct me. |
#2
|
|||
|
|||
dynamic pressure on the nose of aircraft?
In article om,
dhawal damle wrote: I am preparing for a exam and in one of the question papers, there was a question Q) What is the dynamic pressure an the nose of aircraft? Maximum or minimum or zero. in the book the ans. is given as zero,but I doubt that could be printing mistake. I think the answer shuld be maximum dynamic pressure at the nose. please correct me. It is certainly a mistake, as the nose (assuming that the airplane is flying nose-first) is at the stagnation pressure, which is the sum of the static pressure and dynamic pressure. Actually, the dynamic pressure is constant for any velocity/density combination. Q = Rho*V**2/2 |
#3
|
|||
|
|||
dynamic pressure on the nose of aircraft?
how do they define dynamic pressure? (as in "changing" pressure.)
Perhaps it is zero if the plane is at a constant speed. And static pressure is positive(maximum). dhawal damle wrote: I am preparing for a exam and in one of the question papers, there was a question Q) What is the dynamic pressure an the nose of aircraft? Maximum or minimum or zero. in the book the ans. is given as zero,but I doubt that could be printing mistake. I think the answer shuld be maximum dynamic pressure at the nose. please correct me. |
#4
|
|||
|
|||
dynamic pressure on the nose of aircraft?
dhawal damle wrote:
Q) What is the dynamic pressure an the nose of aircraft? Maximum or minimum or zero. in the book the ans. is given as zero,but I doubt that could be printing mistake. I think the answer shuld be maximum dynamic pressure at the nose. This is a case where the assumptions (and definitions) in the underlying model used make a difference in the answer. The dynamic pressure acting directly on the very center of the nose of an "ideal incompressible inviscid fluid" is, by definition, zero. The question, alas, sucks due to unclear context. When I see the word "nose" I (like you it seems) visualize something other than what the question writer assumed. "Nose" for the question writer means only the very center point where the air hits the point - and the air flow directly on that mathematical point comes to rest. But without context, when the rest of us see "nose" we think the question is talking about the dynamic pressure summed up over the _area_ of the nose. Here's a web page that hopefully provides some insight into the context the question writer had in mind: http://www.centennialofflight.gov/es...d_Flow/TH7.htm And just to confuse things, here's a web page from the same site that mentions putting a pitot tube out in front of the nose(!) of a plane for measuring dynamic pressure (and hence airspeed): http://www.centennialofflight.gov/es...vation/TH8.htm |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Dynamic Soaring on TV | quietman | Soaring | 1 | February 20th 07 11:48 PM |
dynamic soaring | bagmaker | Soaring | 15 | January 23rd 07 05:08 PM |
dynamic prop balancing | George A. Graham | Home Built | 2 | April 21st 05 01:20 PM |
Aerospuul Dynamic Wt9 | Steves News | Home Built | 1 | August 28th 04 11:59 AM |
Whats that probe which sticks out of the aircraft nose? | Gangatharan | Products | 1 | February 12th 04 03:06 PM |