### Abstract

Lean combustion is preferred in combustors for cleaner emission. But, the major problem in running the combustor in lean condition is the flame blow-out, due to lower burning velocity in lean condition. To sustain lean combustion, early prediction of lean blowout (LBO) is needed. This need calls for developing new strategies to predict LBO. This work is on development of strategies based on symbolic analysis of time series data obtained from the combustor. Optical signal (CH* chemiluminescence) based time series data has been captured from a laboratory scale dump combustor. Gaseous fuel has been used at different premixing regimes to run the combustor. The time series data obtained are partitioned to different cells to get symbol strings and subsequently generate a probabilistic finite state automata (PFSA). The constructed PFSA is called D-Markov machines. These machines have a deterministic algebraic structure and the states are represented by symbol blocks of length D or less, where D is a positive integer. The estimated state probability vector is found out on the basis of number of occurrence of each symbol over a time duration. A reference state vector is calculated at a condition that is sufficiently away from the state of LBO. For a given state, the deviation of the state vector from the reference vector can be computed and used as an anomaly measure for early detection of LBO. The problem of LBO prediction is posed in a pattern classification setting and the underlying algorithms have been tested on experimental data at different extents of fuel-air premixing and fuel/air ratio. It is found that, over a wide range of fuel-air premixing, performance of D-Markov machines, as LBO predictors, is better with D > 1 than those with D = 1.

Original language | English (US) |
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Title of host publication | Combustion for Power Generation and Transportation |

Subtitle of host publication | Technology, Challenges and Prospects |

Publisher | Springer Singapore |

Pages | 153-167 |

Number of pages | 15 |

ISBN (Electronic) | 9789811037856 |

ISBN (Print) | 9789811037849 |

DOIs | |

State | Published - Jan 20 2017 |

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### All Science Journal Classification (ASJC) codes

- Engineering(all)

### Cite this

*Combustion for Power Generation and Transportation: Technology, Challenges and Prospects*(pp. 153-167). Springer Singapore. https://doi.org/10.1007/978-981-10-3785-6_8

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*Combustion for Power Generation and Transportation: Technology, Challenges and Prospects.*Springer Singapore, pp. 153-167. https://doi.org/10.1007/978-981-10-3785-6_8

**Lean blowout (LBO) prediction through symbolic time series analysis.** / Sen, Swarnendu; Sarkar, Soumalya; Chaudhari, Rajendra R.; Mukhopadhyay, Achintya; Ray, Asok.

Research output: Chapter in Book/Report/Conference proceeding › Chapter

TY - CHAP

T1 - Lean blowout (LBO) prediction through symbolic time series analysis

AU - Sen, Swarnendu

AU - Sarkar, Soumalya

AU - Chaudhari, Rajendra R.

AU - Mukhopadhyay, Achintya

AU - Ray, Asok

PY - 2017/1/20

Y1 - 2017/1/20

N2 - Lean combustion is preferred in combustors for cleaner emission. But, the major problem in running the combustor in lean condition is the flame blow-out, due to lower burning velocity in lean condition. To sustain lean combustion, early prediction of lean blowout (LBO) is needed. This need calls for developing new strategies to predict LBO. This work is on development of strategies based on symbolic analysis of time series data obtained from the combustor. Optical signal (CH* chemiluminescence) based time series data has been captured from a laboratory scale dump combustor. Gaseous fuel has been used at different premixing regimes to run the combustor. The time series data obtained are partitioned to different cells to get symbol strings and subsequently generate a probabilistic finite state automata (PFSA). The constructed PFSA is called D-Markov machines. These machines have a deterministic algebraic structure and the states are represented by symbol blocks of length D or less, where D is a positive integer. The estimated state probability vector is found out on the basis of number of occurrence of each symbol over a time duration. A reference state vector is calculated at a condition that is sufficiently away from the state of LBO. For a given state, the deviation of the state vector from the reference vector can be computed and used as an anomaly measure for early detection of LBO. The problem of LBO prediction is posed in a pattern classification setting and the underlying algorithms have been tested on experimental data at different extents of fuel-air premixing and fuel/air ratio. It is found that, over a wide range of fuel-air premixing, performance of D-Markov machines, as LBO predictors, is better with D > 1 than those with D = 1.

AB - Lean combustion is preferred in combustors for cleaner emission. But, the major problem in running the combustor in lean condition is the flame blow-out, due to lower burning velocity in lean condition. To sustain lean combustion, early prediction of lean blowout (LBO) is needed. This need calls for developing new strategies to predict LBO. This work is on development of strategies based on symbolic analysis of time series data obtained from the combustor. Optical signal (CH* chemiluminescence) based time series data has been captured from a laboratory scale dump combustor. Gaseous fuel has been used at different premixing regimes to run the combustor. The time series data obtained are partitioned to different cells to get symbol strings and subsequently generate a probabilistic finite state automata (PFSA). The constructed PFSA is called D-Markov machines. These machines have a deterministic algebraic structure and the states are represented by symbol blocks of length D or less, where D is a positive integer. The estimated state probability vector is found out on the basis of number of occurrence of each symbol over a time duration. A reference state vector is calculated at a condition that is sufficiently away from the state of LBO. For a given state, the deviation of the state vector from the reference vector can be computed and used as an anomaly measure for early detection of LBO. The problem of LBO prediction is posed in a pattern classification setting and the underlying algorithms have been tested on experimental data at different extents of fuel-air premixing and fuel/air ratio. It is found that, over a wide range of fuel-air premixing, performance of D-Markov machines, as LBO predictors, is better with D > 1 than those with D = 1.

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U2 - 10.1007/978-981-10-3785-6_8

DO - 10.1007/978-981-10-3785-6_8

M3 - Chapter

SN - 9789811037849

SP - 153

EP - 167

BT - Combustion for Power Generation and Transportation

PB - Springer Singapore

ER -