Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Effect of Vortex Generator in Intake Pipe on the Moisture Concentration Distributions and Combustion Performance in a CI Engine

흡기관내 와류생성기가 압축착화엔진의 수분 농도 분포 및 연소성능 향상에 미치는 영향

  • 정석훈 (국립공주대학교 기계공학과 대학원) ;
  • 서현규 (국립공주대학교 기계자동차공학부)
  • Received : 2018.09.11
  • Accepted : 2018.12.11
  • Published : 2018.12.30
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Abstract

In this work, optimization of blade shape for the improvement of mixture formation and vortex of intake port was performed by numerically, and the combustion performance of CI engine with optimized blade shape was investigated. To achieve this, 3 types of blade shape were studied under the different air flow mass conditions and the numerical results were investigated in terms of humidification water, moisture concentration, and velocity distributions. Evaporated liquid mass was also compared under various test conditions to reveal the turbulent intensity in an intake port. It was observed that the optimized blade shape can improve the humidification water, moisture concentration, and velocity distributions of intake port inside. The evaporated liquid mass was also increased under the conditions with blade. Especially, low NOx emissions was observed with optimized blade condition.

Keywords

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Fig. 2 Schematics of blade shape

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Fig. 1 Schematics of intake pipe geometry

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Fig. 3 Schematics of test engine

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Fig. 4 Effect of blade shape on the humidification water distributions (inlet flow rate = 7.5 g/s)

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Fig. 6 Effect of blade shape on the velocity distributions (inlet flow rate = 7.5 g/s)

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Fig. 7 Effect of inlet flow rate on the evaporated liquid mass

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Fig. 8 Effect of blade on the cylinder pressure and ROHR

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Fig. 5 Effect of blade shape on the moisture concentration distributions (inlet flow rate = 7.5 g/s)

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Fig. 9 Effect of blade on the ISNO and ISSoot generation

Table 1. Numerical analysis conditions

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Table 2. Specifications of diesel engine

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