dr.ir. J.B.W. Kok

 

Turbulent Combustion in Gas Turbines

Email: j.b.w.kok@utwente.nl
Phone: +31 53 489 2582
Fax: +31 53 489 3663
University of Twente
Faculty of Engineering
P.O. Box 217, 7500 AE Enschede
The Netherlands

Education:


1985 MSc Mech. Eng., Univ. of Twente, FluidMech.: Wave propagation in a fluidized bed.
1989 PhD Mech. Eng., Univ. of Twente, Fluid Mech.: Dynamics of gas bubbles moving through liquid.

Employment history:


1985-1989 Research position lab. Fluid Dynamics and Heat Transfer, University of Twente
1989-1996 Associate professor lab. Thermal Engineering , University of Twente
1996-1997 Visiting associate professor Cornell University, NY, USA.
1997- Associate professor lab. Thermal Engineering, University of Twente.

Current research projects

European Union funded projects:

DESIRE: Acoustic oscillations and structural liner vibration in lean premixed natural gas fired gas turbine combustors (2001-2005)
HEGSA: Acoustic oscillations in syngas fired gas turbine combustion chambers (2002-2006).
MAST B Liquid: Combustion in oil fired gas turbine combustors using steam diluted air (2002-2006).

FLUISTCOM: The physics of acoustic oscillations and structural liner vibration in lean premixed natural gas fired gas turbine combustors (2004-2007).

LIMOUSINE: Limit cycles of thermo-acoustic oscillations in gas turbine combustors (2008-2012).

ULRICO: Ultra rich combustion of natural gas and soot formation (2009-2012).

COPA: Coupled parallel simulation of gas turbines (2012-2015)

Planned research projects

OxyCom: Oxyfuel combustion using partial oxidation of natural gas.

Cryo Compr: Design of lubricant free small clearance cryogenic piston compressors


Five Selected Publications


Kok, J.B.W., Dynamics of a pair of gas bubbles moving through liquid: part II: experiments., Eur. J. Mech. B/fluids, vol 12, no 4, 541-561, 1993.
Kok, J.B.W., Benschop, A.J., Propagation velocity and rate of attenuation of surface waves on a homogeneously fluidized bed, Int. J. Multiphase Flow, vol.20, no 3, 651-657, 1994.
Kok, J.B.W., Van der Wal, S, Mixing in T-junctions, Appl Math. Modeling, vol. 20, 232-243, 1996.
Kok, J.B.W., Louis, J.J.J., Modeling Turbulent Combustion in a non-adiabatic CO/H2 flame using reaction progress variables, ASME paper 96-GT-184, proc. Int. Gas Turbine and Aeroengine Congress, Birmingham, UK, june 10-13, ASME, NY, 1996.
Kok, J.B.W., Louis, J.J.J., Modeling of turbulent combustion in a CO/H2 diffusion flame using reaction progress variables, accepted for publication in Combust. Sci. and Techn., 1997.

Publications in Scientific Journals
Scientific Publications in Refereed Conference Proceedings

Current teaching
Engineering Thermodynamics (114101)
Project C (110304). Design of integrated power/heat generating systems
Diffusion and Mass Transport (114137)

Education:


1985 MSc Mechanical Engineering, University of Twente, Fluid Dynamics.
Title MSc thesis: Wave propagation in a fluidized bed.
Advisor: Prof.dr.ir. L. van Wijngaarden.


1989 PhD Mechanical Engineering, University of Twente, Fluid Dynamics.
Title PhD thesis: Dynamics of gas bubbles moving through liquid.
Advisor: Prof.dr.ir. L. van Wijngaarden.

Publications in Scientific Journals.


Kok, J.B.W., Kinetic energy and added mass of hydrodynamically interacting gas bubbles in liquid, Physica 148A (1988), 240-252.

Kok, J.B.W., Dynamics of gas bubbles moving through liquid, PhD thesis University of Twente, The Netherlands, 1989.

Vincent, C.C.J., Kok, J.B.W., Investigation of the overall transient performance of the industrial two-phase closed loop thermosyphon, Int. J. Heat and Mass Transfer, 35-6, 1419-1426, 1992.

Kok, J.B.W., Collision dynamics of bubble pairs moving through a perfect liquid, Applied Scientific Research, 50, 169-188, 1993.

Kok, J.B.W., Dynamics of a pair of gas bubbles moving through liquid: part I: theory, Eur. J. Mech. B/fluids, vol 12, no 4, 515-540, 1993.

Kok, J.B.W., Dynamics of a pair of gas bubbles moving through liquid: part II: experiments., Eur. J. Mech. B/fluids, vol 12, no 4, 541-561, 1993.

Kok, J.B.W., Benschop, A.J., Propagation velocity and rate of attenuation of surface waves on a homogeneously fluidized bed, Int. J. Multiphase Flow, vol.20, no 3, 651-657, 1994.

Kok, J.B.W., Van der Wal, S, Mixing in T-junctions, Appl Math. Modeling, vol. 20, 232-243, 1996.


Eggels, R.L.G.M., Louis, J.J.J., Kok, J.B.W., Goeij, L.P.H. de, Comparison of conventional and low-dimensional manifold methods to reduce CO/H2-air mechanisms for turbulent flame modeling, Combust. Sci. and Techn., vol. 123, 347-362, 1997.


Kok, J.B.W., Louis, J.J.J., Modeling of turbulent combustion in a CO/H2 diffusion flame using reaction progress variables, accepted for publication in Combust. Sci. and Techn., 1997.


Kok, J.B.W., The Fokker-Planck equation for bubbly flows and the motion of gas bubble pairs, paper accepted for publication by Applied Scientific Research, 1997.

Louis, J.J.J., Kok, J.B.W., Klein, S.A., Modeling and measurements of turbulent non-adiabatic CO/H2 combustion, in preparation.


Louis, J.J.J., Kok, J.B.W., Modeling turbulent combustion of coal gas in a gas turbine combustor, taking into account chemical non-equilibrium and heat loss, in preparation.


Kok, J.B.W., Louis, J.J.J., Yu, J.H., Measurements and modeling of turbulent premixed non-adiabatic combustion of methane in a cylindrical furnace, paper in preparation.

Oude Nijeweme D.J., Kok J.B.W., Stone C.R., Wyszynski L., Unsteady in-cylinder heat transfer in a sark ignition engine: experiments and modelling, Proc. Instn. Mech. Engrs., Vol. 215, part D, pp 747-760, 2001.

Louis J.J., Kok J.B.W., Modelling and Measurements of a 16 kW turbulent nonadiabatic syngas diffusion flame in a cooled cylindrical combustion chamber, Combustion and Flame 125, pp 1012-1031, 2001

Scientific Publications in Refereed Conference Proceedings

Kok, J.B.W., Hydrodynamic equations and effective properties of bubbly flows, proc int. congr. "Transient Phenomena in Multiphase Flow", ed. N. Afgan, Hemisphere, Washington, 1988.


Kok, J.B.W., Binary collisions between gas bubbles moving through liquid, book of abstracts of the XVII International Congress of Theoretical and Applied Mechanics, Grenoble, France, August 1988.

Kok, J.B.W., Dynamics of gas bubbles moving through liquid, PhD thesis University of Twente, The Netherlands, 1989.

Kok, J.B.W., Benschop, A.J., Propagation velocity and rate of attenuation of surface waves on a homogeneously fluidized bed, book of abstracts of the IUTAM Symposium on Mechanics of Fluidized Beds, Stanford, California, USA, July 1-4 1991.


Boersma, J.M., Kok, J.B.W., Analysis of the isobaric combustion of premixed methane-air mixtures, VDI Berichte 922: proc. of the 15. Deutscher Flammentag, Verbrennung und Feuerungen, pp 31-44, Bochum, FRG, 1991.

Rosendal, F.J.J., Kok, J.B.W., Visualization and LDA-measurements on swirling flows in expanding tubes, proceedings of the IV Int. Conference on Laser Anemometry: advances and applications, pp 491-497, Cleveland, Ohio, USA, 1991.

Rosendal, F.J.J., Kok, J.B.W., Brouwers, J.H.H., Analytical calculations and LDA-measurements on swirling flows in expanding tubes, proc. of the 1st European Fluid Mechanics Conference, Cambridge, 16-20 september 1991.

Boersma, J.M., Kok, J.B.W., Modeling of NOx emission by gas turbine combustors, book of abstracts of the 24th Int. Symp. on Combustion, august 1992, the Combustion Institute, University of Australia, Australia.

Kok, J.B.W., Louis, J.J.J, Boersma, J.M., Modeling of methane-air combustion at gas turbine combustor conditions, proc. of the Anglo-German combustion symposium, Cambridge, 29-3-1993 until 2-4-1993, 96-99, 1993.

Kok, J.B.W., Rosendal, F.J.J., Brouwers, J.J.H., LDA-measurements on swirling flows in tubes, in Laser Anemometry: Advances and Applications, proc. of the Vth int. conf., J.M. Bessem, R. Booij, H.W.H.E. Godefroy, P.J. de Groot, Eds., proc. SPIE 2052, SPIE, Bellingham, Washington, USA, pp 721-728, 1993.

Kok, J.B.W., Van der Wal, S., Mixing in T-junctions, proc. of the 1st int. user conference of FLOW3D, Oxford, 6-7 may 1993, ed. I.P. Jones, AEA Technology, Harwell UK, pp 341-368, 1993.

Louis, J.J.J., Kok, J.B.W., Modeling of turbulent hydrogen combustion using reaction progress variables, proc. of the 6th joint EPS-APS international conference on physics computing: PC '94, Lugano, eds. R. Gruber & M. Tomassini, European Physical Society, Geneva, 453-456, 1994.

Yu, J.H., Kok, J.B.W., Brouwers, J.J.H., Measurements on turbulent lean premixed combustion in a cylindrical furnace with variable heat transfer, book of abstracts of the 25th Int. Symp. on Combustion, aug 1994, the Combustion Institute, Univ. of Irvine, Cal, USA.

Louis, J.J.J., Kok, J.B.W., Detailed chemistry calculated with reaction progress variables by FLOW3D in turbulent CO/H2 flames, proc. 2nd CFDS Int. User Conf., 5-9 december 1994, Pittsburgh, USA, ed. I.P. Jones, AEA Techn., Harwell, 359-368, 1994.

Kok, J.B.W., Louis, J.J.J., Modeling of turbulent CH4 and CO/H2 combustion with the use of reaction progress variables, proc. 2nd CFDS Int. User Conf., 5-9 december 1994, Pittsburgh, USA, ed. I.P. Jones, AEA Techn., Harwell, 61-74, 1994.

Yu, J.H., Kok, J.B.W., Brouwers, J.J.H., Measurement and simulation of NO emission in turbulent lean premixed combustion at gas turbine conditions, proc. of the International Conference on Energy and Environment, May 8-10 1995, Shanghai, China.

Kok, J.B.W., Louis, J.J.J., Modeling turbulent combustion of a non-adiabatic H2/CO/air flame using reaction progress variables, book of abstracts Euromech colloquium 340, august 30 - september 1 1995, Delft, The Netherlands.

Kok, J.B.W., Yu, J.H., Measurements on turbulent lean premixed combustion of natural gas in a cylindrical furnace with variable heat transfer, proc. of the 1995 International Gas Research Conference, Cannes 6-9 november 1995, France, Vol 5, 296-310, 1995.


Kok, J.B.W., Louis, J.J.J., Modeling Turbulent Combustion in a non-adiabatic CO/H2 flame using reaction progress variables, ASME paper 96-GT-184, proc. Int. Gas Turbine and Aeroengine Congress, Birmingham, UK, june 10-13, ASME, NY, 1996.


Kok, J.B.W., Louis, J.J.J., Modeling Turbulent Combustion in a non-adiabatic CO/H2 flame using reaction progress variables, proc. 3rd CFX Int. Users conf., oct. 30-nov. 1 1996, London, UK, ed. I.P. Jones, AEA techn., Harwell, 1996.


Klein, S.A., Kok, J.B.W., Noise in non-premixed turbulent coal gas flames, proc. 2nd Int. Symp. on Turbulence, Heat and Mass Transfer, june 9-12 1997 Delft, 1997.


Kok, J.B.W., Pope, S.B., PDF methods applied on non-premixed CO/H2 jet flames with radiative heat loss, paper in preparation for the Int. Symp. On Combustion, August 1998, Boulder.


Klein, S.A., Kok, J.B.W., Noise in non-premixed turbulent coal gas flames, paper to be presented at the ASA symposium, June 1998, Seattle.

Kok Jim B.W., Berkel Ary I. van, Louis Jurgen J., Modeling of Ignition and Combustion in a Partially Premixed Coal Gas Flame., Proc. 2nd joint meeting US sections Combustion Institute 24-28 March 2001, ed. J.O. Keller, Lawrence Berkeley National Laboratory, Oakland (USA), session 25, paper 147, 2001.

Albrecht B.A., Kok J.B.W., Veringa H., Generation of synthesis gas and power by partial oxidation of natural gas in a gas turbine, Proc. 2001 International Gas Research Conference, 5-8 November 2001, Amsterdam, paper IUO-06, 2001.

Current teaching.

Engineering Thermodynamics (114101)

Undergraduate course


Thermodynamic behavior of liquids and gases in open and closed systems, 1st and 2nd law, entropy, enthalpy, Helmholtz and Gibbs potential, Legendre transformation, Maxwell eqs, Euler eq, Gibbs-Duhem eq, phase transition, saturated vapor, superheated vapor, thermodynamic charts and tables, Rankine and Brayton cycle, application on steam cycle, gas turbine engine, refrigeration cycles.
Textbook: Fundamentals of Thermal Fluid Sciences, Y.A. Cengel, R.H. turner, 2nd int. ed., McGraw-Hill, New York, 2004.
Engineering Thermodynamics, J.B.W. Kok, in preparation.

Project C (110304). Design of integrated power/heat generating systems.

Undergraduate course


Design of integrated power/heat generating systems
by groups of 6-8 students.
Topics:
- analysis and design of a waste incinerator with steam power plant in Twente (NL).
- design of a steam cycle for an existing 50 MW gas turbine in Hengelo (NL).
- design of a gas turbine powered high speed train.
Supporting courses: Engineering thermodynamics and Chain management.

Diffusion and Mass Transport (114137)

Graduate course


Elementary processes in diffusion and mass transport, molecular diffusion in binary and multicomponent systems, concentration distributions with chemical reactions, turbulent mixing, chemical reactors, chemical reactions in turbulent flow reactors.
Textbook: Transport Phenomena, R.B. Bird, W.E. Stewart, E.N. Lightfoot, Wiley, New York, 1960.