Harish Alagani

Indian Institute of Petroleum (IIP) | IIP · Tribology and Combustion Division (IIP)

In many practical applications, such as in blast furnaces and boilers, pulverized coal is used as a reducing agent and energy source. This chapter presents the predicted characteristics of naturally entrained coal dust flames in a sudden expansion region. Further, it also investigates the effect of particle size and equivalence ratio on the flame d...

This study presents the flame characteristics of laminar cross-flow non-premixed biogas-air flames established in a boundary layer using ANSYS Fluent. The validated numerical model is comprehensive enough to include variable thermo-physical properties, multi-component diffusion, short chemical kinetics mechanism, and optically thin approximation-ba...

Biogas, a renewable fuel, has low operational stability range in burners due to its inherent carbon-dioxide content. In cross-flow configuration, biogas is injected from a horizontal injector and air is supplied in an orthogonal direction to the fuel flow. To increase the stable operating regime, backward facing steps are used. Systematic numerical...

This paper presents the numerical investigation of the effect of length of flat plate in the upstream of fuel injector on the characteristics of laminar cross-flow non-premixed biogas-air flames. The validated numerical model is comprehensive enough to include variable thermo-physical properties, multi-component diffusion, short chemical kinetics m...

Interaction of combustible particles with flames occurs in fire scenarios. In this study, numerical investigation of interaction of coal dust or micron-sized particles with lean premixed methane-air flames is presented. A two-dimensional axisymmetric domain is employed to simulate conical premixed flames from lab-scale Bunsen burner. A chemical kin...

This experimental work analyzes the characteristics and stability regimes of Liquefied Petroleum Gas (LPG) - air flames in a cross-flow non-premixed configuration. LPG is injected from a horizontal porous plate kept in flush with the bottom wall of a wind tunnel and air flows parallel over its surface. Three fuel flow rates corresponding to power r...

This study numerically investigates the effects of addition of micron-sized coal particles on the characteristics of lean methane-air premixed flames. Mass, momentum, species and energy conservation equations are solved in a two-dimensional axisymmetric domain. A short chemical kinetics mechanism for methane oxidation with 25 species and 121 reacti...

The downward flame spread rate over cylindrical PMMA rods of length 50 mm and diameter 10 mm is experimentally studied. Four angular orientations of 0º, 25º, 57º and 90º, where 0º corresponds to the horizontal flame spread and the 90º corresponds to the vertical flame spread, are considered. Using a digital camera high definition videos are recorde...

Numerical investigation of flame structure and reaction zones of laminar biogas jet diffusion flame has been carried out. The flame structure and reaction zones of biogas are compared with pure methane and methane diluted with nitrogen flame. To capture all the flame features, chemkin mechanism which has 25 species and 121 reactions is used. Fuels...

Oil spill cleanup in Arctic is usually done by in-situ burning. The fuel oil will have a very low initial temperature as well as cold boundaries. This study focuses on the variation of the mass burning rate of the fuel with varying initial temperatures of the fuel, which is kept in a metal bowl surrounded by ice. Kerosene is chosen as the fuel. The...

Oil spill cleanup in Arctic is usually done by in-situ burning. The fuel oil will have a very low initial temperature as well as cold boundaries. This study focuses on the variation of the mass burning rate of the fuel with varying initial temperatures of the fuel, which is kept in a metal bowl surrounded by ice. Kerosene is chosen as the fuel. The...

In this work, numerical investigation is carried out used commercial CFD software ANSYS FLUENT, to study the propagation of flames through premixed CO-H 2-air mixtures, representing premixed syngas-air combustion, inside adiabatic circular tubes. The tube is either open at both ends or closed at one end. Ignition has been carried out near the open...