درباره ما
NASA-TN-D-6997
Shock waves and drag in the numerical calculation of isentropic transonic flow
Year: 1972
Abstract: Properties of the shock relations for steady, irrotational, transonic flow are discussed and compared for the full and approximate governing potential in common use. Results from numerical experiments are presented to show that the use of proper finite difference schemes provide realistic solutions and do not introduce spurious shock waves. Analysis also shows that realistic drags can be computed from shock waves that occur in isentropic flow. In analogy to the Oswatitsch drag equation, which relates the drag to entropy production in shock waves, a formula is derived for isentropic flow that relates drag to the momentum gain through an isentropic shock. A more accurate formula for drag, based on entropy production, is also derived, and examples of wave drag evaluation based on these formulas are given and comparisons are made with experimental results.
Subject: DRAG
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T18:24:51Z | |
| date available | 2017-09-04T18:24:51Z | |
| date copyright | 01/01/1972 | |
| date issued | 1972 | |
| identifier other | IHLNGEAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std;jsery=autho47037D83FCDCAC42/handle/yse/207088 | |
| description abstract | Properties of the shock relations for steady, irrotational, transonic flow are discussed and compared for the full and approximate governing potential in common use. Results from numerical experiments are presented to show that the use of proper finite difference schemes provide realistic solutions and do not introduce spurious shock waves. Analysis also shows that realistic drags can be computed from shock waves that occur in isentropic flow. In analogy to the Oswatitsch drag equation, which relates the drag to entropy production in shock waves, a formula is derived for isentropic flow that relates drag to the momentum gain through an isentropic shock. A more accurate formula for drag, based on entropy production, is also derived, and examples of wave drag evaluation based on these formulas are given and comparisons are made with experimental results. | |
| language | English | |
| title | NASA-TN-D-6997 | num |
| title | Shock waves and drag in the numerical calculation of isentropic transonic flow | en |
| type | standard | |
| page | 46 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1972 | |
| contenttype | fulltext | |
| subject keywords | DRAG | |
| subject keywords | FINITE DIFFERENCE THEORY | |
| subject keywords | POTENTIAL FLOW | |
| subject keywords | SHOCK WAVES | |
| subject keywords | STEADY FLOW | |
| subject keywords | TRANSONIC FLOW |