Measurement of water vapour in axisymmetric jet development using TDLAS

Al-Manea, A. and Buttsworth, D. and Leis, J. and Choudhury, R. and Saleh, K. (2018) Measurement of water vapour in axisymmetric jet development using TDLAS. In: 21st Australasian Fluid Mechanics Conference, 10-13 Dec 2018, Adelaide, Australia.


Turbulent mixing of multi-phase compressible jets formed
within steam ejectors requires further investigation so that reliable models can be developed to aid in the ejector design process. As a step towards the non-intrusive measurement of the flow conditions in such a jet, tunable diode laser absorption spectroscopy (TDLAS) is used to investigate the development of an axisymmetric subsonic jet of air containing a high concentration of water vapour (with a relative humidity around 70 % ), and a co-flowing stream of dry nitrogen. The radius of the jet nozzle was 14 mm and the measurements were made at distances of 5, 10, and 15 mm downstream of the nozzle exit. At each downstream distance, TDLAS measurements of water vapour features at around 1392 nm were made using a discrete mode laser. At each measurement location, the absorbance was recorded and the water vapour concentration was determined by using an Abel inversion and by fitting spectral results from the HITRAN 2012 database to the measured spectra using custom MATLAB scripts. Simulation of the experimental jet conditions was used to assess the accuracy of analysis method, and results indicate an accuracy of better than ± 5 % in the water vapour concentration can be achieved using the method proposed in this paper.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 12 Jun 2019 06:22
Last Modified: 27 Jun 2019 05:58
Uncontrolled Keywords: TDLAS, jets, absorption
Fields of Research : 09 Engineering > 0913 Mechanical Engineering > 091399 Mechanical Engineering not elsewhere classified

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