Numerical Simulation and Scaling of NO<sub>x</sub>Emissions from Turbulent Hydrogen Jet Flames with Various Amounts of Helium Dilution

Chen, Jyh-Yuan; Chang, W.-C.; Koszykowski, M. L.

doi:10.1080/00102209508951938

Cited by 48 publications

(22 citation statements)

References 20 publications

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“…" h u k ρ and " " j k Y u ρ are described by the Boussinesq and gradient diffusion hypotheses; [8], 5-step reduced mechanism model proposed by Chen et al [8] is applied for the source term in the species transport equations. The reason why we choose this model is that it has high predictability, numerical stability and light computational load.…”

Section: Governing Equationsmentioning

confidence: 99%

Numerical simulation of tip leakage vortex effect on hydrogen-combustion flow around 3D turbine blade

2008

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In these years, a lot of environmental problems such as air pollution and exhaustion of fossil fuels have been discussed intensively. In our laboratory, a hydrogen-fueled propulsion system has been researched as an alternative to conventional systems. A hydrogen-fueled propulsion system is expected to have higher power, lighter weight and lower emissions. However, for the practical use, there exist many problems that must be overcome. Considering these backgrounds, jet engines with hydrogen-fueled combustion within a turbine blade passage have been studied. Although some studies have been made on injecting and burning hydrogen fuel from a stator surface, little is known about the interaction between a tip leakage vortex near the suction side of a rotor tip and hydrogen-fueled combustion.The purpose of this study is to clarify the influence of the tip leakage vortex on the characteristics of the 3-dimensional flow field with hydrogen-fueled combustion within a turbine blade passage. Reynolds-averaged compressible Navier-Stokes equations are solved with incorporating a k-ε turbulence and a reduced chemical mechanism models. Using the computational results, the 3-dimensional turbulent flow field with chemical reactions is numerically visualized, and the three-dimensional turbulent flow fields with hydrogen combustion and the structure of the tip leakage vortex are investigated.

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Section: Governing Equationsmentioning

confidence: 99%

Numerical simulation of tip leakage vortex effect on hydrogen-combustion flow around 3D turbine blade

2008

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“…Turbulence correlations (i.e. For the chemical reaction, 5-step reduced mechanism model proposed by Chen et al (3) is applied for the source term in the chemical species transport equations. Through the preliminary studies, it was found that this model has high predictability, stability and light computational load.…”

Section: Governing Equationmentioning

confidence: 99%

3D computation of hydrogen-fueled combustion around turbine blade-effect of arrangement of injector holes-

2006

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Recently, a number of environmental problems caused from fossil fuel combustion have been focused on. In addition, with the eventual depletion of fossil energy resources, hydrogen gas is expected to be an alternative energy resource in the near future. It is characterized by high energy per unit weight, high reaction rate, wide range of flammability and the low emission property. On the other hand, many researches have been underway in several countries to improve a propulsion system for an advanced aircraft. The system is required to have higher power, lighter weight and lower emissions than existing ones. In such a future propulsion system, hydrogen gas would be one of the promising fuels for realizing the requirements. Considering these backgrounds, our group has proposed a new cycle concept for hydrogen-fueled aircraft propulsion system. In the present study, we perform 3 dimensional computations of turbulent flow fields with hydrogen-fueled combustion around a turbine blade. The main objective is to clarify the influence of arrangement of hydrogen injector holes. Changing the chordwise and spanwise spacings of the holes, the 3 dimensional nature of the flow and thermal fields is numerically studied.

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“…The reasons why we choose this model are that it has high predictability for chemical species concentrations and ignition characteristic, good numerical stability and relatively lighter computational load. Table 1 shows the 5-step reduced mechanism by Chen et al [10]. As shown in the table, this model takes into account 8 species (i.e.…”

Section: Governing Equationsmentioning

confidence: 99%

“…It should be noted that, to estimate turbulence effects, the high-Reynolds-number type k-ε turbulence model proposed by Launder and Spalding [6] is employed. After verifying the chemical reaction models proposed by Huang and Chen [7], Balakrishnan and Williams [8], Sanchez et al [9] and Chen et al [10], 5-step reduced mechanism model proposed by Chen et al [10] is adopted for calculating the source terms in the species transport equations (4). The reasons why we choose this model are that it has high predictability for chemical species concentrations and ignition characteristic, good numerical stability and relatively lighter computational load.…”

Section: Governing Equationsmentioning

confidence: 99%

Comparative Investigation of Lean Effect of Stator Vane in Hydrogen-Fueled Combustion Turbine

Nakamura¹

2013

IJEPE

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Abstract:In these years, a lot of environmental problems like air pollution and exhaustion of fossil fuels have been discussed intensively. In our laboratory, a hydrogen-fueled propulsion system has been researched as an alternative to conventional jet engine systems. A hydrogen-fueled propulsion system is expected to have higher power, lighter weight and lower emissions. However, for the practical use, there exist many problems that must be overcome. For example, there is little knowledge how the three-dimensional vane design affects on the flow characteristics and the aerodynamic performance of the hydrogen-fueled combustion turbine vane. The purpose of the present study is to clarify the influence of lean vanes, which is one of typical 3-dimensional design techniques, on the characteristics of the 3-dimensional flow field with hydrogen-fueled combustion within a turbine vane passage. The Reynolds-averaged compressible Navier-Stokes equations are solved with incorporating a k-ε turbulence and a reduced chemical mechanism models. Using the computational results for normal, compound lean and reverse compound lean vanes, the 3-dimensional turbulent flow fields with chemical reactions are visualized and investigated numerically. Through this study, it is confirmed that compound lean can suppress the excessively high temperature region on the endwall and reduce the total pressure loss.

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Numerical Simulation and Scaling of NO_xEmissions from Turbulent Hydrogen Jet Flames with Various Amounts of Helium Dilution

Cited by 48 publications

References 20 publications

Numerical simulation of tip leakage vortex effect on hydrogen-combustion flow around 3D turbine blade

Numerical simulation of tip leakage vortex effect on hydrogen-combustion flow around 3D turbine blade

3D computation of hydrogen-fueled combustion around turbine blade-effect of arrangement of injector holes-

Comparative Investigation of Lean Effect of Stator Vane in Hydrogen-Fueled Combustion Turbine

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Numerical Simulation and Scaling of NOxEmissions from Turbulent Hydrogen Jet Flames with Various Amounts of Helium Dilution

Cited by 48 publications

References 20 publications

Numerical simulation of tip leakage vortex effect on hydrogen-combustion flow around 3D turbine blade

Numerical simulation of tip leakage vortex effect on hydrogen-combustion flow around 3D turbine blade

3D computation of hydrogen-fueled combustion around turbine blade-effect of arrangement of injector holes-

Comparative Investigation of Lean Effect of Stator Vane in Hydrogen-Fueled Combustion Turbine

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Numerical Simulation and Scaling of NO_xEmissions from Turbulent Hydrogen Jet Flames with Various Amounts of Helium Dilution