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Quantitative 2D thermometry in turbulent sooting non-premixed flames using filtered Rayleigh scattering

Journal Article · · Applied Optics
DOI:https://doi.org/10.1364/AO.428563· OSTI ID:1804929

This paper demonstrates the application of a thermometry method in turbulent sooting non-premixed flames using filtered Rayleigh scattering (FRS). Fuel tailoring is used to establish a specific C 2 H 2 -based fuel mixture such that temperature can be determined accurately by a single FRS measurement over the entirety of mixture fraction space, or equivalently, for all relevant thermo-chemical states. Evaluation is performed in a hierarchy of flows to establish measurement precision and accuracy. Initial assessments in a series of heated fuel mixtures; non-sooting, near-adiabatic flat flames; and laminar non-premixed sooting flames show accuracy of the approach over a full range of expected temperatures and high single-shot measurement precision (e.g.,   65 < <#comment/> S N R < <#comment/> 80 ) for temperatures between 1900 and 2200 K. Subsequently, 2D temperature measurements are evaluated in a turbulent non-premixed sooting flame. For the current fuel mixture, the local mixture-averaged Rayleigh scattering cross section is nearly constant over all composition space, and thus traditional laser Rayleigh scattering (LRS) is used as a measurement standard in the absence of soot. The results show excellent agreement between the proposed FRS thermometry approach and LRS in non-sooting regions. In the presence of soot, the proposed FRS-based approach shows no signs of interference. In addition, 2D temperature imaging shows high SNR (60–74) over all temperature conditions. Thus, we believe the proposed methodology successfully provides a high-resolution 2D temperature method under turbulent sooting flame conditions.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0019115
OSTI ID:
1804929
Alternate ID(s):
OSTI ID: 1852837
Journal Information:
Applied Optics, Journal Name: Applied Optics Journal Issue: 19 Vol. 60; ISSN 1559-128X; ISSN APOPAI
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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