Venkatakrishnan, L (2004) Development of a Quantitative Schlieren Technique: BOS. Project Report. National Aerospace Laboratories, Bangalore.
![]() |
PDF
PD_EA_0404.pdf Restricted to Registered users only Download (5MB) | Request a copy |
![]() |
Indexer Terms (Generate index codes conversion from application/pdf to indexcodes)
indexcodes.txt Restricted to Registered users only Download (10kB) | Request a copy |
Abstract
A new technique making use of the recent advances in CCD technology and fast processors to obtain quantitative Schlieren of density fields in high-speed flows requiring only a digital camera was proposed by Meier (1999) called Background Oriented Schlieren. This report details the implementation of this technique to obtain density and its validation on an axisymmetric supersonic flow over a 150 cone. Comparisons with cone tables show excellent agreement. Measurements were also made on an axisymmetric converging nozzle (Mj=1) operating at moderately and highly expanded values of nozzle pressure ratios. The validation of the Filtered Back Projection Tomography (FBPT) used in this technique was done by extracting the central plane of a 4-jet configuration. Density fields for two nozzle expansion ratios are presented. The study shows that meaningful quantitative data can be extracted using minimal hardware with this technology.
Item Type: | Monograph (Project Report) |
---|---|
Uncontrolled Keywords: | Quantitative Schlieren, Density measurements, BOS, Cone-cylinder, Underexpanded jet, Supersonic flow |
Subjects: | AERONAUTICS > Aerodynamics |
Depositing User: | Smt Bhagya Rekha KA |
Date Deposited: | 24 Aug 2011 08:11 |
Last Modified: | 24 Aug 2011 08:11 |
URI: | http://nal-ir.nal.res.in/id/eprint/9928 |
Actions (login required)
![]() |
View Item |