Simulations of NOx Emissions from Low Emissions Discrete Jet Injector Combustor Tests

Abstract

An experimental and computational study was conducted to evaluate the performance and emissions characteristics of a candidate Lean Direct Injection (LDI) combustor configuration with a mix of simplex and airblast injectors. The National Combustion Code (NCC) was used to predict the experimentally measured EINOx emissions for test conditions representing low power, medium power, and high-power engine cycle conditions. Of the six cases modeled with the NCC using a reduced-kinetics finite-rate mechanism and lagrangian spray modeling, reasonable predictions of combustor exit temperature and EINOx were obtained at two highpower cycle conditions.

Novel Combustion Concepts for Sustainable Energy Development

“…41, 42, and 43, and Table 6 that both LDI-2 configurations were significant departures from the baseline LDI-1 design and that no use was made of the CFD models in making the LDI-2 design selections. Ajmani et al 2013aAjmani et al , b, c, 2014Ajmani and Breisacher 2014a, b) for details; here we will discuss only one figure from Ajmani et al (2014). The author is a strong believer in using CFD in the design process (Mongia and Smith 1978, Mongia et al 1986, 2004aMongia 1993Mongia , 2001aMongia , b, 2008.…”

“…The author is a strong believer in using CFD in the design process (Mongia and Smith 1978, Mongia et al 1986, 2004aMongia 1993Mongia , 2001aMongia , b, 2008. Details on the configurations, simulations, and data are given by Ajmani et al (2014); here we will provide only the summary of the results and future plans. Subsequently, many publications have been shared by his former team members contributing significantly toward the usefulness of CFD in the design process.…”

“…Summary of EINO x predictions (NCC) and Experimental Data (WFST) at P 3 = 130 psia and various cycle conditions for four different LDI-2 geometries; fromAjmani et al (2014) 162…”

Review of modern low emissions combustion technologies for aero gas turbine engines

“…NCC has been used to analyse both single [146,147] and multiple injector LDI configurations [149,148]. Comprehensive CFD studies [96][97][98] were performed to evaluate combustion characteristics of multi-Lean Direct Injection combustion systems (LDI-1) so as to prepare a tool to provide guidance for defining and refining the next-generation LDI-2 and LDI-3. Non-reacting computations were performed to enable extensive comparison of axialvelocity, radial-velocity, tangential-velocity, and turbulent kinetic-energy with experimental data [92].…”

CFD Evaluation Of A 3rd Generation LDI Combustor

“…The CFD analysis to support the ERA programs LDI-2 injector designs used many of the best-practices developed for the NCC using single-element and nine-element LDI-1 designs [Ajmani 2013] 11 . Details of the CFD efforts using NASA's NCC code for the ERA program's LDI-2 configurations were reported by [Ajmani 2014a] 12 (Woodward FST's LDI-2) and [Ajmani 2014b] 13 (Goodrich's multipoint LDI).…”