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Featured researches published by N. Hosseini.


International Journal of Spray and Combustion Dynamics | 2018

Intrinsic thermoacoustic modes and their interplay with acoustic modes in a Rijke burner

N. Hosseini; Vn Viktor Kornilov; I. Lopez Arteaga; Wolfgang Polifke; O.J. Teerling; L.P.H. de Goey

The interplays between acoustic and intrinsic modes in a model of a Rijke burner are revealed and their influence on the prediction of thermoacoustic instabilities is demonstrated. To this end, the system is examined for a range of time delays, temperature ratios and reflection coefficients as adjustable parameters. A linear acoustic network model is used and all modes with frequency below the cut-on frequency for non-planar acoustic waves are considered. The results show that when reflection coefficients are reduced, the presence of a pure ITA mode limits the reduction in the growth rate that usually results from a reduction of the reflection coefficients. In certain conditions, the growth rates can even increase by decreasing reflections. As the time delay of the flame and thus the ITA frequency decreases, the acoustic modes couple to and subsequently decouple from the pure ITA modes. These effects cause the maximum growth rate to alternate between the modes. This investigation draws a broad picture of acoustic and intrinsic modes, which is crucial to accurate prediction and interpretation of thermoacoustic instabilities.


International Journal of Spray and Combustion Dynamics | 2017

Passive control of instabilities in combustion systems with heat exchanger

Aswathy Surendran; Maria A. Heckl; N. Hosseini; O.J. Teerling

One of the major concerns in the operability of power generation systems is their susceptibility to combustion instabilities. In this work, we explore whether a heat exchanger, an integral component of a domestic boiler, can be made to act as a passive controller that suppresses combustion instabilities. The combustor is modelled as a quarter-wave resonator (1-D, open at one end, closed at the other) with a compact heat source inside, which is modelled by a time-lag law. The heat exchanger is modelled as an array of tubes with bias flow and is placed near the closed end of the resonator, causing it to behave like a cavity-backed slit plate: an effective acoustic absorber. For simplicity and ease of analysis, we treat the physical processes of heat transfer and acoustic scattering occurring at the heat exchanger as two individual processes separated by an infinitesimal distance. The aeroacoustic response of the tube array is modelled using a quasi-steady approach and the heat transfer across the heat exchanger is modelled by assuming it to be a heat sink. Unsteady numerical simulations were carried out to obtain the heat exchanger transfer function, which is the response of the heat transfer at heat exchanger to upstream velocity perturbations. Combining the aeroacoustic response and the heat exchanger transfer function, in the limit of the distance between these processes tending to zero, gives the net influence of the heat exchanger. Other parameters of interest are the heat source location and the cavity length (the distance between the tube array and the closed end). We then construct stability maps for the first resonant mode of the aforementioned combustor configuration, for various parameter combinations. Our model predicts that stability can be achieved for a wide range of parameters.


21st International Congress on Sound and Vibration 2014, ICSV 2014 | 2014

Development of a numerical model for obtaining flame transfer function in a simplified slit burner with heat exchanger

N. Hosseini; Vn Viktor Kornilov; O.J. Teerling; Ines Lopez Arteaga; P. De Goey


Archive | 2016

Use of heat exchanger for passive control of combustion instabilities

Aswathy Surendran; N. Hosseini; O.J. Teerling; Maria A. Heckl


23rd International Congress on Sound and Vibration, ICSV 2016, 10 July 2016 through 14 July 2016 | 2016

Acoustic scattering behavior of a 2D flame with heat exchanger in cross-flow

L. S. Chen; Wolfgang Polifke; N. Hosseini; O.J. Teerling; Ines Lopez Arteaga; Vn Viktor Kornilov; P. De Goey


22nd International Congress on Sound and Vibration, ICSV 2015, 12 July 2015 through 16 July 2015 | 2015

Transfer function calculations of segregated elements in a simplified slit burner with heat exchanger

N. Hosseini; Vn Viktor Kornilov; O.J. Teerling; Ines Lopez Arteaga; L.P.H. de Goey


Archive | 2014

Numerical investigations of the response of a simplified burner-heat exchanger system to inlet velocity excitations

N. Hosseini; Vn Viktor Kornilov; O.J. Teerling; I Ines Lopez; de Lph Philip Goey


Combustion and Flame | 2018

Evaluating thermoacoustic properties of heating appliances considering the burner and heat exchanger as acoustically active elements

N. Hosseini; Vn Viktor Kornilov; O.J. Teerling; Ines Lopez Arteaga; Philip de Goey


8th European Combustion Meeting (ECM 2017), April 18-21, Dubrovnik, Croatia | 2017

Thermoacoustic instabilities in a Rijke tube with heating and cooling elements

N. Hosseini; O.J. Teerling; Vn Viktor Kornilov; I. Lopez Arteaga; L.P.H. de Goey


Archive | 2016

Investigating the effects of a heat exchanger on the thermoacoustics in a Rijke tube

N. Hosseini; Vn Viktor Kornilov; O.J. Teerling; I. Lopez Arteaga; L.P.H. de Goey

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Vn Viktor Kornilov

Eindhoven University of Technology

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L.P.H. de Goey

Eindhoven University of Technology

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Ines Lopez Arteaga

Royal Institute of Technology

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I Ines Lopez

Eindhoven University of Technology

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de Lph Philip Goey

Eindhoven University of Technology

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I. Lopez Arteaga

Royal Institute of Technology

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Philip de Goey

Eindhoven University of Technology

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