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2020 Vol.25, Issue 1

Research Article

Combustion Characteristics by Plate Shape of Turbulence Generator in Low Swirl Combustor : Part I Non-reactive Isothermal Flow

저선회 연소기에서 난류생성기 판 형상에 의한 연소특성 : Part I 비반응장 유동

Minseok Han1
,
Keeman Lee1*
한 민석1
,
이 기만1*
1Department of Aerospace Engineering, Sunchon National University
1순천대학교 우주항공공학과
* Corresponding Author
31 March 2020. pp. 1-11
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Abstract

This paper investigates the concept of fractal grid as turbulence generator which has constant reduce rate of grid thickness in low swirl combustor. Turbulence performance comparison of with and without swirler in a non-reactive isothermal flow of model nozzle was investigated using a fractal grid with various RRBT ratios and a general grid with conventional perforated hole configuration. As comparison barometers of turbulence performance, turbulence mean velocity(U¯), turbulence fluctuation(u') and turbulence intensity(u'/U¯) were investigated. For all the case, the turbulence intensity of fractal grid was higher than the general grid based on perforated holes. A maximum u' showed to locate at a minimum position of U¯, which is consistent with wake interaction theory. Also, the turbulence intensity increased with smaller value of RRBT in fractal grid. With a constant bulk velocity of 6 m/s, the inner recirculation zone was not detected by using a PIV system and a hot-wire anemometry analysis with radial direction, which is a very important phenomenon to meet the low swirl combustion.

Keywords
Low Swirl Combustion
Turbulence Generator
Fractal Grid
Non-reactive Isothermal Flow
Turbulence Intensity
Wake Interaction

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Information
  • Publisher :The Korean Society Combustion
  • Publisher(Ko) :한국연소학회
  • Journal Title :Journal of The Korean Society Combustion
  • Journal Title(Ko) :한국연소학회지
  • Volume : 25
  • No :1
  • Pages :1-11
  • Received Date : 2019-09-17
  • Revised Date : 2019-10-14
  • Accepted Date : 2019-10-29
  • DOI :https://doi.org/10.15231/jksc.2020.25.1.001
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