SU534661A1 - Method for measuring turbulent surface friction and static pressure - Google Patents
Method for measuring turbulent surface friction and static pressureInfo
- Publication number
- SU534661A1 SU534661A1 SU2132475A SU2132475A SU534661A1 SU 534661 A1 SU534661 A1 SU 534661A1 SU 2132475 A SU2132475 A SU 2132475A SU 2132475 A SU2132475 A SU 2132475A SU 534661 A1 SU534661 A1 SU 534661A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- surface friction
- static pressure
- turbulent surface
- measuring
- measuring turbulent
- Prior art date
Links
Landscapes
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Description
(54) СПОСОБ ИЗМЕРЕНИЯ ТУРБУЛЕНТНОГО И СТАТИЧЕСКОГО ДАВЛЕНИЯ 1 ПОВЕРХНОСТНОГО ТРЕНИЯ 2 А и В - посто нные величины. Разность осредненных по ных напоров Р и FJ, дле двух значений толщин пристенной эбласти турбулентного пограничного сло ,„ зависит только от свойств жидкости, турбулентного поверхностного трени в месте из Мерени и двух характерных р амеров по нормали к поверхности da 2 пристенной рбласти турбулентного пограничного сло . Поскольку в этом случае имеетс два 1характерных линейных резмера по нормали к поверхности, то безразмерные комплекс ; |вход шие в калибровочную характеристику, ;могут быть образованы с использованием jB качестве квадрата характерного линейно го размера t величин d , Д или d 5,.. ;В калибровочную характеристику в качестве безразмерного комплекса войдет также От. :ношение характерных линейных размеров 3,/d, (или d., /dj ) и она принкмает ( PrPzH VjiLl/jL 1 fVVl г 4pV В зависимости от того,кака , величи-;на вз та в качестве квадрата характерного линейного размера, калибровочна характеристика (2) предлагаемого способа |может быть представлена в трех эквива лентных формах. Они могут быть получены непосредстве| |Но из соотношени {1), записанного дл каждой. из толщин пристенной области в ( in, 2 Г где eog С А. После вычитани соотношени I о / дл толщины 3 2. из соответствующего соотно-)шени дл толшины с1 и р да преобразо аний калибровочна характеристика предла;гаемого способа получаетс в следующих 1трех эквивалентных формах:(54) THE METHOD OF MEASURING TURBULENT AND STATIC PRESSURE 1 SURFACE FRICTION 2 A and B are constant values. The difference between the averaged overpressure heads P and FJ, for two values of the wall thickness of the turbulent boundary layer, “depends only on the properties of the fluid, the turbulent surface friction in the place of Mereni and two characteristic dimensions normal to the surface da 2 of the wall region of the turbulent boundary layer. Since in this case there are two 1characteristic linear resimers normal to the surface, the dimensionless complex; | included in the calibration characteristic,; can be formed using jB as the square of the characteristic linear size t of the values d, D or d 5, ..; The calibration characteristic as a dimensionless complex will also include From. : wearing characteristic linear dimensions 3, / d, (or d., / dj) and she printsmaet (PrPzH VjiLl / jL 1 fVVl g 4pV Depending on how much;; as taken as the square of the characteristic linear size, The calibration characteristic (2) of the proposed method | can be represented in three equivalent forms. They can be obtained directly | | But from relation (1) written for each. from the thickness of the wall area in (in, 2 G where eog C A. After subtracting the ratio I o / dl for thickness 3 2. from the corresponding ratio for thickness c1 and a number of transformations, the calibration characteristic is obtained; equivalent forms:
Я (P-P,)dI (PP-d)
1±1 ±
A+Bgo A + Bgo
00
li/li /
4p -V4p -V
10ten
iOiO
4р50 , Способ измерени ; турбулентного поверх- йостного трени и статического давлени , ,основанный на измерении осредненного пол- :ного напора в пристенной области турбулент-, ного пограничного сло , отличающий55 с тем, что, с целью упрощени измерени , одновременно измер ют осредненные ролные напоры дл двух различных толщиН; пристенной области турбулентногчэ пограничного сло и по замеренным двум величинам4p50, measuring method; turbulent surface friction and static pressure, based on the measurement of the averaged total pressure: in the near-wall region of the turbulent boundary layer, which differs 55 so that, in order to simplify the measurement, the averaged rollers are measured for two different thicknesses ; on the wall region of the turbulent boundary layer and on the measured two quantities
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU2132475A SU534661A1 (en) | 1975-05-11 | 1975-05-11 | Method for measuring turbulent surface friction and static pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU2132475A SU534661A1 (en) | 1975-05-11 | 1975-05-11 | Method for measuring turbulent surface friction and static pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU534661A1 true SU534661A1 (en) | 1976-11-05 |
Family
ID=20618856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU2132475A SU534661A1 (en) | 1975-05-11 | 1975-05-11 | Method for measuring turbulent surface friction and static pressure |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU534661A1 (en) |
-
1975
- 1975-05-11 SU SU2132475A patent/SU534661A1/en active
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