Numerical simulation of gel fuel gas-phase ignition by a local source of limited heat content

Research output: Contribution to journalArticle

Abstract

A mathematical model has been developed to predict the characteristics of interdependent physical and chemical processes taking place in a gel fuel ignition by a hot cylinder-shaped particle located on its surface. The density values have been established for the heat flux (60–950 kW/m2) from the local heating source to the fuel, that are required for its ignition in a wide range of various initial temperatures (840–1500 K), dimensions (radius 2.5–10 mm, height 5–20 mm), and particle materials (steel, copper, aluminum, ceramics, and carbon). Changes in these parameters were found to significantly affect the main characteristic of the process – ignition delay times – under the near-threshold ignition conditions. During local conductive heating, the delay times of the gas-phase ignition of the fuel vary between 0.02 and 0.8 s. At the initial fuel temperature of 80 K, the duration of the induction period rises by 40% as compared to the fuel ignition delay time at the initial temperature of 275 K in the conditions of ignition by a particle with a temperature of 1000 K. It has been established that regardless of the local heating source parameters and conditions of the process, the ignition of the fuel occurs near the base of the hot particle in the immediate vicinity of the gel fuel surface.

Original languageEnglish
JournalActa Astronautica
DOIs
Publication statusAccepted/In press - 1 Jan 2019

Fingerprint

Gas fuels
Ignition
Enthalpy
Gels
Computer simulation
Time delay
Heating
Particles (particulate matter)
Temperature
Heat flux
Mathematical models
Copper
Aluminum
Carbon
Steel
Gases

Keywords

  • Gel fuel
  • Hot particle
  • Ignition
  • Low temperature
  • Mathematical model
  • Phase transitions

ASJC Scopus subject areas

  • Aerospace Engineering

Cite this

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title = "Numerical simulation of gel fuel gas-phase ignition by a local source of limited heat content",
abstract = "A mathematical model has been developed to predict the characteristics of interdependent physical and chemical processes taking place in a gel fuel ignition by a hot cylinder-shaped particle located on its surface. The density values have been established for the heat flux (60–950 kW/m2) from the local heating source to the fuel, that are required for its ignition in a wide range of various initial temperatures (840–1500 K), dimensions (radius 2.5–10 mm, height 5–20 mm), and particle materials (steel, copper, aluminum, ceramics, and carbon). Changes in these parameters were found to significantly affect the main characteristic of the process – ignition delay times – under the near-threshold ignition conditions. During local conductive heating, the delay times of the gas-phase ignition of the fuel vary between 0.02 and 0.8 s. At the initial fuel temperature of 80 K, the duration of the induction period rises by 40{\%} as compared to the fuel ignition delay time at the initial temperature of 275 K in the conditions of ignition by a particle with a temperature of 1000 K. It has been established that regardless of the local heating source parameters and conditions of the process, the ignition of the fuel occurs near the base of the hot particle in the immediate vicinity of the gel fuel surface.",
keywords = "Gel fuel, Hot particle, Ignition, Low temperature, Mathematical model, Phase transitions",
author = "Glushkov, {D. O.} and Kuznetsov, {G. V.} and Strizhak, {P. A.} and Taburchinov, {R. I.}",
year = "2019",
month = "1",
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language = "English",
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AU - Glushkov, D. O.

AU - Kuznetsov, G. V.

AU - Strizhak, P. A.

AU - Taburchinov, R. I.

PY - 2019/1/1

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N2 - A mathematical model has been developed to predict the characteristics of interdependent physical and chemical processes taking place in a gel fuel ignition by a hot cylinder-shaped particle located on its surface. The density values have been established for the heat flux (60–950 kW/m2) from the local heating source to the fuel, that are required for its ignition in a wide range of various initial temperatures (840–1500 K), dimensions (radius 2.5–10 mm, height 5–20 mm), and particle materials (steel, copper, aluminum, ceramics, and carbon). Changes in these parameters were found to significantly affect the main characteristic of the process – ignition delay times – under the near-threshold ignition conditions. During local conductive heating, the delay times of the gas-phase ignition of the fuel vary between 0.02 and 0.8 s. At the initial fuel temperature of 80 K, the duration of the induction period rises by 40% as compared to the fuel ignition delay time at the initial temperature of 275 K in the conditions of ignition by a particle with a temperature of 1000 K. It has been established that regardless of the local heating source parameters and conditions of the process, the ignition of the fuel occurs near the base of the hot particle in the immediate vicinity of the gel fuel surface.

AB - A mathematical model has been developed to predict the characteristics of interdependent physical and chemical processes taking place in a gel fuel ignition by a hot cylinder-shaped particle located on its surface. The density values have been established for the heat flux (60–950 kW/m2) from the local heating source to the fuel, that are required for its ignition in a wide range of various initial temperatures (840–1500 K), dimensions (radius 2.5–10 mm, height 5–20 mm), and particle materials (steel, copper, aluminum, ceramics, and carbon). Changes in these parameters were found to significantly affect the main characteristic of the process – ignition delay times – under the near-threshold ignition conditions. During local conductive heating, the delay times of the gas-phase ignition of the fuel vary between 0.02 and 0.8 s. At the initial fuel temperature of 80 K, the duration of the induction period rises by 40% as compared to the fuel ignition delay time at the initial temperature of 275 K in the conditions of ignition by a particle with a temperature of 1000 K. It has been established that regardless of the local heating source parameters and conditions of the process, the ignition of the fuel occurs near the base of the hot particle in the immediate vicinity of the gel fuel surface.

KW - Gel fuel

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KW - Phase transitions

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