Temperature, Pressure, Velocity, and Water Vapor Mole Fraction Profiles in a Ramjet Combustor using Dual Frequency Comb Spectroscopy and a High Temperature Absorption Database
arxiv(2024)
摘要
Accurate diagnostics of the combustor region of ramjet engines can improve
engine design and create benchmarks for computational fluid dynamics models.
Previous works demonstrate that dual frequency comb spectroscopy can provide
low uncertainty diagnostics of multiple flow parameters in the non-combusting
regions of ramjets. However, the high temperatures present in the combustor
present a challenge for broadband spectroscopic absorption models that are used
to interpret measurements in these regions. Here, we utilize a new water vapor
absorption database created for high temperature water-air mixtures to fit
spectra measured in a ground-test ramjet engine with a broadband near-infrared
dual comb absorption spectrometer. We extract 2D profiles of pressure,
temperature, water mole fraction, and velocity using this new database. We
demonstrate that the new database provides the lowest fit residuals compared to
other water vapor absorption databases. We compare computational fluid dynamics
simulations of the combustor with the measured data to demonstrate that the
simulations overpredict heat release and water vapor production.
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