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Spray characterisation of diesel using a hybrid atomizer

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Abstract

The diesel fuel stream is squeezed between the inner air and outer annular air sheet in the hybrid atomizer, which contains the properties of both air-blast and pressure-swirl atomizers. The fuel sheet is fed tangentially to produce a swirling effect. The swirling direction of the fuel flow is fixed, and the swirling motions are given to the air sheets in the same and opposite of the fuel swirling direction. The inner air sheet can also be fed axially. Diesel has been used as the fuel, and different configurations have been employed for a comparative study with different airflow rates. In the flow field, a specific region is selected to find the distribution of droplet diameters. For calculating droplet diameters, the Particle/Droplet Image Analysis (PDIA) technique has been used. Macroscopic characteristics of the spray has been analyzed directly from the images. It is noted that at high air flow rates, breakup takes place quickly because of the turbulent nature of the diesel sheet.

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Abbreviations

Co_Co:

Outer Co and Inner Co Swirl

Co_Cu:

Outer Co and Inner Counter Swirl

Co_Ax:

Outer Co swirl and Inner Axial

Cu_Co:

Outer Counter and Inner Co Swirl

Cu_Cu:

Outer Counter and Inner Counter Swirl

Cu_Ax:

Outer Counter swirl and Inner Axial

LPM:

Litres per Minute

fps:

Frames per second

SMD:

Sauter Mean Diameter

AD:

Average Diameter

PDIA:

Particle/Droplet Image Analysis

θ:

Cone Angle (Deg.)

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Acknowledgements

The financial assistance of Gas Turbine Research Establishment (GTRE) under the GATET scheme and DRDO, Govt. of India are thankfully acknowledged. Help from Dr. Souvick Chatterjee for developing the image processing methods is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Automobile Engineering, Memari Govt. Polytechnic, Govt. of West Bengal, Memari, 713401, India

    Amlan Garai

  2. Department of Mechanical Engineering, Iowa State University, Ames, IA, 50011, USA

    Tryambak Gangopadhyay

  3. Department of Mechanical Engineering, Jadavpur University, Kolkata, 700 032, India

    Achintya Mukhopadhyay & Swarnendu Sen

Authors
  1. Amlan Garai
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  2. Tryambak Gangopadhyay
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  3. Achintya Mukhopadhyay
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  4. Swarnendu Sen
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Correspondence to Amlan Garai.

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Garai, A., Gangopadhyay, T., Mukhopadhyay, A. et al. Spray characterisation of diesel using a hybrid atomizer. Sādhanā 48, 150 (2023). https://doi.org/10.1007/s12046-023-02200-5

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  • DOI: https://doi.org/10.1007/s12046-023-02200-5

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