Quantitative rainbow schlieren deflectometry



Publisher: National Aeronautics and Space Administration, Publisher: National Technical Information Service, distributor in [Washington, D.C, Springfield, Va

Written in English
Published: Downloads: 369
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Subjects:

  • Analog to digital converters.,
  • Charge coupled devices.,
  • Deflection.,
  • Interferometry.,
  • Rainbows.,
  • Refractivity.

Edition Notes

StatementPaul S. Greenberg, Robert B. Klimek, and Donald R. Buchele.
SeriesNASA-TM -- 111231., NASA technical memorandum -- 111231.
ContributionsKlimek, Robert B., Buchele, Donald R., United States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL15424090M

Department of Mechanical Engineering University of Alabama Hardaway Hall Tuscaloosa, AL email: [email protected] Phone:   Book Search tips Selecting this option will search all publications across the Scitation platform Selecting this option will search all publications for the Publisher/Society in context. Greenberg, R. B. Klimek, and D. R. Buchele, “ Quantitative rainbow schlieren deflectometry,” Appl. Opt. 34, (). Traditional schlieren photography has several important disadvantages when designing a system to image refractive index gradients including the relatively high cost of parabolic mirrors and the fact that the technique does not easily yield quantitative data. Both these issues are resolved by using synthetic Schileren photography, but this technique produces images with a lower resolution than.   Kolhe, P.S., and Agrawal, A.K., , “Ultra High-Speed Rainbow Schlieren Deflectometry of Turbulence Measurements in Jets and Flames,” Proceedings of the Central States Meeting of the Combustion Institute, Paper 12S, April ,

Microgravity conditions were simulated in the s drop tower at NASA John H. Glenn Research Center. The jet flow was observed by quantitative rainbow schlieren deflectometry, a non-intrusive line of sight measurement technique suited for the microgravity environment. The flow structure was characterized by distribution of helium mole. The rainbow schlieren deflectometry (RSD) technique is used to determine the liquid boundary and the fuel volume fraction distributions in the vapor region of a high-pressure fuel spray. Experiments were conducted in a constant pressure flow vessel, whereby a customized single-hole common-rail diesel injector is used to introduce n-heptane fuel. Quantitative analysis of 3-D flow fields by rainbow schlieren deflectometry is presented. The method is based on the measurement of the deflection of collimated light rays due to the gradients in the refractive index of the test flow field. In this method, the schlieren apparatus is modified by replacing the knife edge with a computer-generated. Quantitative Rainbow Schlieren Deflectometry as a Temperature Diagnostic for Spherical Flames Numerical analysis and experimental results are presented to define a method for quantitatively measuring the temperature distribution of a spherical diffusion flame using Rainbow Schlieren Deflectometry in microgravity. First, a numerical analysis is completed to show the method can .

In this thesis, the Rainbow Schlieren Deflectometry (RSD) technique is employed to provide local quantitative measurements during the transient fuel-air mixing process by examining a reacting n-heptane fuel spray injected into ambient air at 28 bar and K. An optically accessible constant pressure flow vessel (CPFV) and common rail diesel. NASA Technical Reports Server (NTRS) Gravitational Effects on Near Field Flow Structure of Low Density Gas Jets Item Preview.   For extracting quantitative information from the color images, HSI (hue-saturation-intensity) representation of color can be selected. (also called rainbow schlieren deflectometry) uses a white light source instead of a laser. Color schlieren technique Notes | EduRev notes for is made by best teachers who have written some of the best. A fellow of the American Society of Mechanical Engineers, Agrawal has been the recipient of several research grants and is the world’s most published author on the topic of rainbow schlieren deflectometry, an optical flow diagnostics technique used to .

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Quantitative rainbow schlieren deflectometry (SuDoc NAS ) [Paul S. Greenberg] on *FREE* shipping on qualifying : Paul S. Greenberg. Miniature rainbow schlieren deflectometry system for quantitative measurements in microjets and flames. Rajani P. Satti, Pankaj S.

Kolhe, Semih Olcmen. Get this from a library. Quantitative rainbow schlieren deflectometry. [Paul S Greenberg; Robert B Klimek; Donald R Buchele; United States. National Aeronautics and Space Administration.].

Quantitative Rainbow Schlieren Deflectometry as a Temperature Diagnostic for Spherical Flames. Miniature rainbow schlieren deflectometry system for quantitative measurements in microjets and flames.

Quantitative rainbow schlieren deflectometry. By Paul S. Greenberg, Donald R. Buchele and Robert B. Klimek. Abstract. In the rainbow schlieren apparatus, a continuously graded rainbow filter is placed in the back focal plane of the decollimating lens. Refractive-index gradients in the test section thus appear as gradations in hue rather than.

Color schlieren deflectometry for characterization of crystal growth processes: KDP and lysozyme Journal of Crystal Growth, Vol.

No. 6 Abel inversion of deflectometric data: comparison of accuracy and noise propagation of existing techniques.

Numerical analysis and experimental results are presented to define a method for quantitatively measuring the temperature distribution of a spherical diffusion flame using rainbow schlieren deflectometry in microgravity. The method employed illustrates the necessary steps for the preliminary design of a rainbow schlieren system.

The largest deflection for the normal gravity flame considered. Part of the SpringerBriefs in Applied Sciences and Technology book series Al-Ammar K, Agrawal AK, Gollahalli SR, Griffin D () Application of rainbow schlieren deflectometry for concentration measurements in Quantitative rainbow schlieren deflectometry book axisymmetric helium jet.

Buchele R () Quantitative rainbow schlieren deflectometry. Appl Opt 34(19)– CrossRef. The quantitative rainbow schlieren deflectometry (RSD) technique was applied to measure temperature and oxygen concentration in an axisymmetric hydrogen gas-jet diffusion flame burning in quiescent air at fuel jet exit Reynolds number of Schlieren measurements were compared with conventional measurements using a thermocouple and a gas-sampling probe.

Quantitative Flow Visualization by Rainbow Schlieren Deflectometry and Pitot Pressure Measurements for Leek Peeler Nozzle Jets Masatoshi Ezoe, Shinichiro Nakao, Yoshiaki Miyazato Department of Mechanical Systems Engineering, The University of Kitakyushu, Fukuoka, Japan Abstract.

Quantitative rainbow schlieren deflectometry. Greenberg PS, Klimek RB, Buchele DR. In the rainbow schlieren apparatus, a continuously graded rainbow filter is placed in the back focal plane of the decollimating lens.

Refractive-index gradients in the test section thus appear as gradations in huerather than irradiance. R. Satti, P. Kolhe, S. Olcmen, A. AgrawalMiniature rainbow schlieren deflectometry system for quantitative measurements in microjets and flames Applied Optics, 46 (15) (), pp.

CrossRef View Record in Scopus Google Scholar. The rainbow schlieren deflectometry has been combined with the computed tomography to obtain three-dimensional density fields of shock containing free jets and we call the method the schlieren CT. Experiments on the schlieren CT have been performed at a nozzle pressure ratio of by using an axisymmetric convergent nozzle with an inner diameter of 10 mm at the exit where the nozzle was.

The following sections comprise a short introduction into the measuring principle of Rainbow Schlieren Deflectometry before introducing the experimental setup and the developed planar and cylindrical heated test specimens, which are in turn used for quantitative evaluation of heat transfer due to free convection in water and air as reference.

Quantitative Rainbow Schlieren Deflectometry as a Temperature Diagnostic for Spherical Flames. By Douglas A. Feikema. Abstract. Numerical analysis and experimental results are presented to define a method for quantitatively measuring the temperature distribution of a spherical diffusion flame using Rainbow Schlieren Deflectometry in.

The quantitative rainbow schlieren deflectometry (RSD) technique was applied to measure temperature and oxygen concentration in an axisymmetric hydrogen gas-jet diffusion flame burning in. The quantitative rainbow schlieren technique has been demonstrated in the past for gaseous fuel jets and is being developed here to enable study of the spray near the injector.

In this work an optically accessible constant pressure flow rig and a modern common rail diesel injector are used to obtain high speed images of vaporizing fuel sprays.

Results and Discussion. Rainbow Schlieren Pictures. The rainbow filter shown in Figure 3 was used to visualize the jets from conventional and improved nozzle. The free jets for four nozzle pressure ratios of NPR (=p os /p b) =,and are displayed with the rainbow schlieren visualization where the back pressure p b is the same as the atmospheric pressure and plenum.

A quantitative visual study of a correctly-expanded supersonic jet of a Mach number of by the rainbow schlieren deflectometry has been conducted to reveal the jet flow field quantitatively. Application of Rainbow Schlieren Deflectometry (RSD) in Combustion • Greenberg et al. () developed quantitative Rainbow Schlieren Deflectometry (RSD) technique utilizing computer - FKM UTM Thermal Fluid Measurement and Diagnostic MMJ DR MAZLAN based imaging approach.

9 • Al-Ammar et al. () used rainbow schlieren. quantitative rainbow schlieren deflectometry (RSD) technique utilizing a computer-based imaging approach where the hue, saturation, and intensity of color were used in quantitative analyses of schlieren images.

The color on the rainbow filter is represented by a single independent parameter, hue, according to the HSI color model. Therefore, a. Quantitative analysis of 3-D flow fields by rainbow schlieren deflectometry is presented.

The method is based on the measurement of the deflection of collimated light rays due to the gradients in the refractive index of the test flow field. In this method, the schlieren apparatus is modified by replacing the knife edge with a computer- generated continuously-graded color (rainbow) filter.

Greenberg et al developed a quantitative schlieren technique by replacing the knife-edge filter in the conventional schlieren apparatus with a computer-generated, continuously graded rainbow filter.

So-called quantitative rainbow schlieren deflectometry or RSD has subsequently been utilized for scalar measurements in steady gas jets (Alammar et. We present quantitative rainbow schlieren deflectometry with tomography for measurements of temperature in three-dimensional gas flows.

The schlieren apparatus with a continuously graded spectral filter of known transmissivity was used to create color schlieren images of the test media.

These images at multiple viewing angles were used to infer. Instantaneous three-dimensional (3D) density distributions of a shock-cell structure of perfectly and imperfectly expanded supersonic microjets escaping into an ambient space are measured.

For the 3D observation of supersonic microjets, non-scanning 3D computerized tomography (CT) technique using a directional quantitative schlieren optical system with flashlight source is employed for. We present quantitative rainbow schlieren deflectometry with tomography for measurements of temperature in three-dimensional gas flows.

The schlieren apparatus with a continuously graded spectral filter of known transmissivity was used to create color schlieren images of the test media.

This site uses cookies. By continuing to use this site you agree to our use of cookies. To find out more, see our Privacy and Cookies policy. Two-dimensional quantitative visualization of isolator shock trains by rainbow schlieren deflectometry 4 June | EPJ Web of Conferences, Vol.

High-Speed Rainbow Schlieren Deflectometry of n-Heptane Sprays Using a Common Rail Diesel Injector. Dependence of single vapor bubble dynamics and heat transfer rates on varying concentration of SiO 2 nanoparticles for a range of subcooled conditions (0–9 °C) has been experimentally studied under nucleate pool boiling configuration.

Non-invasive measurements have been carried out using rainbow schlieren deflectometry. The rainbow schlieren deflectometry is combined with the computed tomography to obtain three-dimensional density fields of a shock-containing free jet issued from a .The quantitative rainbow schlieren technique has been demonstrated in the past for gaseous fuel jets and is being developed here to enable study of the spray near the injector.

In this work, an optically accessible constant pressure flow rig (CPFR) and a modern common rail diesel injector are used to obtain high-speed images of vaporizing fuel.In this thesis, the Rainbow Schlieren Deflectometry (RSD) technique is employed to provide local quantitative measurements during the transient fuel-air mixing process by examining a reacting n-heptane fuel spray injected into ambient air at 28 bar and K.