Wall temperature measurements at elevated pressures and high temperatures in sooting flames in a gas turbine model combustor

Abstract

Wall temperatures were measured with thermographic phosphors on the quartz walls of a model combustor in ethylene/air swirl ames at 3 bar. Three operating conditions were investigated with dierent stoichiometries and with or without additional injection of oxidation air downstream of the primary combustion zone. YAG:Eu and YAG:Dy were used to cover a total temperature range of 10001800 K. Measurements were challenging due to the high thermal background from soot and window degradation at high temperatures. The heat ux through the windows was estimated from the temperature gradient between the in-and outside of the windows. Dierences in temperature and heat ux density proles for the investigated cases can be explained very well with the previously measured dierences in ame temperatures and ame shapes. The heat loss relative to thermal load is quite similar for all investigated ames (1516 %). The results complement previous measurements in these ames to investigate soot formation and oxidation. It is expected, that the data set is a valuable input for numerical simulations of these ames. 1 Introduction Because of the increasingly stringent regulations for particle emissions, i.e. mainly soot, continuing eort is needed for the development and improvement of gas turbines for propulsion and power generation. Soot formation and oxidation in high-pressure turbulent ames are complex processes that are still not completely understood. Numerical simulation is an important tool for the development of gas turbine combustors. However, to evaluate and improve the reliability of numerical predictions, comprehensive experimental data sets are needed from technically-relevant sooting ames under elevated pressures with well-dened boundary conditions. An important parameter in this respect is the temperature of the combustor walls. Due to the lack of accurate measure

A three-equation model for the prediction of soot emissions in LES of gas turbines

“…The flow is simulated on the 40 million tetrahedra unstructured mesh presented in [27]. Adiabatic no-slip walls are considered except for the chamber walls, whose temperature is imposed based on experiments [28]. A look-up table based on the RFPV model [29] is built from the KM2 [21] detailed mechanism, to obtain information on gaseous species, as well as on precursors and on gaseous quantities required for the solid phase.…”

Assessment of External Heat Transfer Modeling of a Laboratory-Scale Combustor Inside a Pressure-Housing Environment

“…2. The measurement error was derived to be about 0.5% for low and intermediate temperature and about 3% for the peak temperatures [28].…”

“…Measured temperatures of the inner and outer surface of the combustion chamber windows along the vertical axis for Case 1[28]. Lines correspond to fits of the experimental data.…”

Assessment of External Heat Transfer Modeling of a Laboratory-Scale Combustor: Effects of Pressure-Housing Environment and Semi-Transparent Viewing Windows

“…2. The measurement error was derived to be about 0.5% for low and intermediate temperature and about 3% for the peak temperatures [29]. The pressure housing is composed of stainless steel, whose mean temperature is noted T 3 = 313 K, and four quartz windows, parallel to the ones of the combustion chamber and with a thickness e 2 = 40 mm.…”

“…Measured temperatures of the inner and outer surface of the combustion chamber windows along the vertical axis for Case 1[29]. Lines correspond to fits of the experimental data.…”