A5039236578- Combustion and flame dynamics
- Fluid Dynamics and Turbulent Flows
- Aerodynamics and Acoustics in Jet Flows
- Fiscal Policy and Economic Growth
- Taxation and Compliance Studies
- Corporate Taxation and Avoidance
- Computational Fluid Dynamics and Aerodynamics
- Wind and Air Flow Studies
- Advanced Combustion Engine Technologies
- Particle Dynamics in Fluid Flows
- Catalytic Processes in Materials Science
- Taxation and Legal Issues
- COVID-19 Pandemic Impacts
- Urban Transport and Accessibility
- Energy, Environment, and Transportation Policies
- Catalysis and Oxidation Reactions
- Gas Dynamics and Kinetic Theory
- Model Reduction and Neural Networks
- Transportation Planning and Optimization
- Transportation and Mobility Innovations
- Fire dynamics and safety research
- Fluid Dynamics and Mixing
- Radiative Heat Transfer Studies
- Gender, Labor, and Family Dynamics
- Probabilistic and Robust Engineering Design
Institute for Fiscal Studies
2022-2024
Georgia Institute of Technology
2017-2023
Indian Institute of Technology Madras
2018
The value-added tax (VAT) is a cornerstone of the modern system. It has many desirable properties in theory: it does not distort firms' production decisions, difficult to evade, and generates substantial amount revenue. Yet, countries there are discrepancies between textbook model VAT its practical implementation. Where implementation diverges from model, may lose properties. We draw on firm-level administrative records 11 at different income levels examine functioning real-world systems....
This study experimentally investigates reacting jets in cross-flow (RJICF), considering flame/shear layer offset, momentum flux ratio ( $J$ ) and density $S$ effects. These results demonstrate that non-reacting JICF RJICF can exhibit very similar or completely different dynamics controlling physics, depending upon streamwise radial flame location. Consistent with prior measurements of Getsinger et al. Exp. Fluids , vol. 53 (3), 2012, pp. 783–801), spatial amplification rates shear vortex...
This study analyses the stability characteristics of shear layer vortices (SLV) in a reacting jet crossflow, analysing effects flame position, momentum flux ratio ( $J$ ) and density $S$ ). It utilizes 40 kHz particle image velocimetry to characterize dominant SLV frequencies, streamwise evolution convective/global for three different canonical configurations, one non-reacting two (‘R1’ ‘R2’). In case, both convective global instability is observed, depending upon . Qualitatively similar...
The response of an inviscid shock to external pressure perturbations in a constant area duct is analyzed terms fundamental processes like perturbation propagation and its interaction with shock. results these elementary are formulated analytically Riemann wave tracking method enable the prediction movement for both upstream downstream perturbations. predictions thus obtained compared finite-volume based numerical simulations Euler equations. This study shows that responds nonlinearly...
Current combined cycle plants can achieve efficiencies of up to 62%. Further increases in efficiency are achievable through higher turbine inlet temperatures. Such high temperatures pose a NOx-abatement limitation with current combustor architectures due increased thermal NO formation. Staged combustion shows the potential for not only at firing temperatures, but also enhanced turn-down performance. devices have been explored literature previously, as well implemented commercially. The...
This paper describes nitrogen oxide (NOx) measurements from a reacting jet in crossflow (RJICF). The NOx production of the RJICF is controlled by stoichiometry, temperature and composition, mixing rates between fluid streams. Mixing occurs both pre- post-flame. Pre-flame refers to reactant prior combustion determines stoichiometry burning; it degree flame lifting, LO, shear layer vortices. Post-flame these secondary products with crossflow; counter-rotating vortex pair. literature has...
This study analyzes the influence of combustion on topology and dynamics a reacting jet in cross flow. Past work has noted that stability shear layer vortices (SLV) is strongly influenced by radial flame location relative to layer. effects downstream development counter-rotating vortex pair (CVP). Large eddy simulations (LES) were performed for four cases - one non-reacting (NR) three (R1, R1.5, R2 where moved from outside inside altering composition crossflow), contrasting both effect flow...
This paper investigates the dynamics of reacting and non-reacting transverse jets in a vitiated crossflow using tomographic particle image velocimetry (TPIV), OH planar laser induced fluorescence (PLIF) OH* Chemiluminescence. These measurements were conducted to assess influence gas expansion dilatation on coherent structure flows. The full velocity gradient tensor is calculated used isolate identify topology structures, quantified via vorticity Q-criterion. In addition, shear layer vortex...
Abstract This paper describes measurements of nitrogen oxide (NOx) emissions from reacting jets in crossflow (RJICF). Primary factors that influence RJICF NOx are: jet stoichiometry, mixing between and before combustion, the remainder with combustion products secondary region. The aforementioned is controlled by shear layer vortices counter-rotating vortex pair, as well flame lifting. coupled effects bulk averaged temperature rise a result (ΔT), stoichiometry (ϕJet), momentum flux ratio (J)...
This paper presents the development of an aviation combustion noise research facility for Rich-Quench-Lean combustors. The begins with a description physics that are considered under umbrella noise. Next, discusses design considerations test facility. Initial results presented along discussion challenges and shortcomings initial experiments. concludes by detailing re-design re-manufacture facility, improved results, potential direct generation sources, lessons learned generation. novelty...
Flow data are often decomposed using proper orthogonal decomposition (POD) of the space–time separated form, $\boldsymbol {q}'\left (\boldsymbol {x},t\right )=\sum _j a_j\left (t\right )\boldsymbol {\phi }_j\left {x}\right )$ , which targets spatially correlated flow structures in an optimal manner. This paper analyses permuted POD (PPOD), decomposes as {n}\right (s,t\right where {x}=(s,\boldsymbol {n})$ is a general spatial coordinate system, $s$ along bulk advection direction and...
High-speed tomographic PIV measurements synchronized with OH-PLIF imaging are used to fully resolve the nine-component velocity-gradient tensor upstream of a turbulent flame front, which is not possible traditional stereo-PIV/PLIF technique.
With high levels of inequality and a rising share capital income in total income, as Gabriel Zucman's piece this symposium pithily highlights, there are several reasons why tax authorities developing countries should place special focus on high-net-worth individuals (HNWIs). First, progressive system structures, combined with concentration, mean that even small increase avoidance evasion amongst the ultra-wealthy can lead to substantial drop overall revenue. Second, HNWIs tend have highly...