Analysis of Unsteady Transonic Flow Fields by Means of the Colour Streak Schlieren Method
This article deals with a new approach to the investigation of unsteady transonic flow fields around aerodynamic models and in blade cascades using a schlieren method of flow visualisation. The principle and the application of the Colour Streak Schlieren Method (CSSM) are defined. The characteristic...
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| Format: | Article |
| Language: | English |
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CTU Central Library
2004-01-01
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| Series: | Acta Polytechnica |
| Subjects: | |
| Online Access: | https://ojs.cvut.cz/ojs/index.php/ap/article/view/560 |
| _version_ | 1828542974262247424 |
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| author | J. Ulrych |
| author_facet | J. Ulrych |
| author_sort | J. Ulrych |
| collection | DOAJ |
| description | This article deals with a new approach to the investigation of unsteady transonic flow fields around aerodynamic models and in blade cascades using a schlieren method of flow visualisation. The principle and the application of the Colour Streak Schlieren Method (CSSM) are defined. The characteristic flow field features were observed and analysed around an oscillating NACA 0012 airfoil under the conditions of transonic free stream Mach number (<em>M</em><em>∞ = 0.9</em><em></em>), initial angle of attack (α = +4 deg), one amplitude of oscillation (Δα=±3 deg), and three frequencies of model oscillation (f = 1, 15, 30 Hz). There is a description of the terminal shock wave hysteresis across the investigated area, which was revealed in particular cases. Application possibilities of CSSM and its further development are discussed. |
| first_indexed | 2024-12-12T02:06:44Z |
| format | Article |
| id | doaj.art-efec0b8e57b74629b375fafc223dcb31 |
| institution | Directory Open Access Journal |
| issn | 1210-2709 1805-2363 |
| language | English |
| last_indexed | 2024-12-12T02:06:44Z |
| publishDate | 2004-01-01 |
| publisher | CTU Central Library |
| record_format | Article |
| series | Acta Polytechnica |
| spelling | doaj.art-efec0b8e57b74629b375fafc223dcb312022-12-22T00:42:02ZengCTU Central LibraryActa Polytechnica1210-27091805-23632004-01-01443560Analysis of Unsteady Transonic Flow Fields by Means of the Colour Streak Schlieren MethodJ. UlrychThis article deals with a new approach to the investigation of unsteady transonic flow fields around aerodynamic models and in blade cascades using a schlieren method of flow visualisation. The principle and the application of the Colour Streak Schlieren Method (CSSM) are defined. The characteristic flow field features were observed and analysed around an oscillating NACA 0012 airfoil under the conditions of transonic free stream Mach number (<em>M</em><em>∞ = 0.9</em><em></em>), initial angle of attack (α = +4 deg), one amplitude of oscillation (Δα=±3 deg), and three frequencies of model oscillation (f = 1, 15, 30 Hz). There is a description of the terminal shock wave hysteresis across the investigated area, which was revealed in particular cases. Application possibilities of CSSM and its further development are discussed.https://ojs.cvut.cz/ojs/index.php/ap/article/view/560High-speed aerodynamicsexperimentflow field analysistransonic flow fieldsflow visualisationColour Streak Schlieren Method |
| spellingShingle | J. Ulrych Analysis of Unsteady Transonic Flow Fields by Means of the Colour Streak Schlieren Method Acta Polytechnica High-speed aerodynamics experiment flow field analysis transonic flow fields flow visualisation Colour Streak Schlieren Method |
| title | Analysis of Unsteady Transonic Flow Fields by Means of the Colour Streak Schlieren Method |
| title_full | Analysis of Unsteady Transonic Flow Fields by Means of the Colour Streak Schlieren Method |
| title_fullStr | Analysis of Unsteady Transonic Flow Fields by Means of the Colour Streak Schlieren Method |
| title_full_unstemmed | Analysis of Unsteady Transonic Flow Fields by Means of the Colour Streak Schlieren Method |
| title_short | Analysis of Unsteady Transonic Flow Fields by Means of the Colour Streak Schlieren Method |
| title_sort | analysis of unsteady transonic flow fields by means of the colour streak schlieren method |
| topic | High-speed aerodynamics experiment flow field analysis transonic flow fields flow visualisation Colour Streak Schlieren Method |
| url | https://ojs.cvut.cz/ojs/index.php/ap/article/view/560 |
| work_keys_str_mv | AT julrych analysisofunsteadytransonicflowfieldsbymeansofthecolourstreakschlierenmethod |