• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

An Investigation into the Ignition Phenomena of Sprays Using a Shock Tube

Research Project

Project/Area Number 61550161
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Thermal engineering
Research InstitutionOsaka University

Principal Investigator

MIZUTANI Yukio  Osaka University, 工学部, 教授 (80028993)

Co-Investigator(Kenkyū-buntansha) NAKABE Kazuyoshi  Osaka University, 工学部, 助手 (80164268)
KATSUKI Masashi  Osaka University, 工学部, 助教授 (20029292)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1987: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1986: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsSpary combustion / Ignition phenomena / Shock tube / Reflected shock / Ultrasonic atomizer / High-speed photography / Ion current / 分光観測 / 着火 / 遅れ時間 / 衝撃波管 / 発光
Research Abstract

Aiming at elucidating the effects of turbulent mixing on the ignition process of a spray, a technique was developed in which a freely falling droplets column produced by an ultrasonic atomizer was ignited behind a reflected shock. The ignition delays of cetane were determined, and the ignition processes were observed by monitoring ion current, detecting spectroscopically the light emission in UV-, visible- and near IR-bands and by the high-speed photography. The principal results were summarized as follws.
(1) The apparent actrivation energy changes radically at 1180K for 0.85MPa; i.e., 170kJ/mol and 31.6kJ/mol, respectively, on the high- and low-temperature sides.
(2) On the high-temperature side, the ignition delay is independent of the heating-up and evaporation of mother droplets, and governed by the gas-phase chemical reaction of the micromist generated by the shattering or peeling of droplets behind the incident shock.
(3) The gas-phase chemical reaction starts as a preflame reactio … More n accompanied by OH radical emission and ion current, growing into a blue flame accomanied by visible-band emission. Hte light emission therafter synchronizes with the convections due to rarefaction fans.
(4) The apparent activation energy of 170kJ/mol on the high-temperature side is close to the data obtained by injecting sprays into a hot stream concurrently or perpendicularly. whereas the one of 31.6kJ/mol on the low-temperature side is close to the data obtained by injecting sprays into a hot stagnant atmosphere or the shock tube data in case the droplets column is disturbed by the secondary flows.
(5) If the temperature is lowered, the amount of micromist generated decreased due to the weakened incident shock so that the intensity of light emission decreases considerably. No luminous flame lump, imageable by the high-speed photography, appears below 1280K, and the rate of misfiring increases rapidly below 1060K.
(6) It is supposed that turbulent mixing has a considerable effects on the ignition process of droplets column, since a completely different ignition process was observed in a situation that the droplets column is disturbed by the secondary flows from the drain tube or the atomizer installing tube. Less

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] 水谷幸夫: 日本機械学会論文集(B編). 52. 1945-1952 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 水谷幸夫: 日本機械学会論文集(B編). 53. 2199-2207 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 水谷幸夫: "Proceedings of the 1lth International Colloquium on Dynamics of Explosions and Reactive Systems" The American Isntitute of Astronautics and Aeronautics, (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yukio MIZUTANI: "A Study on Ignition Phenomena of Sprays Using a Shock Tube" Transactions of the Japan Society of Mechanical Engineers, B. 52. 1945-1952 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yukio MIZUTANI: "A Further Study of Ignition Phenomena of Sprays Using a Shock Tube" Transactions of the Japan Society of Mechanical Engineers, B. 53. 2199-2207 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yukio MIZUTANI: Proceedings of the 11th International Colloquium on Dynamics of Explosions and Reactive Systems. The American Institute of Astronautics and Aeronautics,

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 水谷幸夫: 日本機械学会論文集. 52-476. 1945-1952 (1986)

    • Related Report
      1986 Annual Research Report

URL: 

Published: 1987-03-31   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi