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Experimental Investigation of Flame Aerodynamics for Confined and Unconfined Flow for a Novel Radial-Radial Novel Injector using 2D Laser Doppler Velocimetry

Soni, Abhishek
http://orcid.org/0000-0003-0351-5141
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1552656922178471

Abstract Details

2019, MS, University of Cincinnati, Engineering and Applied Science: Mechanical Engineering.
Flame stabilization is of fundamental importance in design, efficient performance and the reliable operation of gas turbine combustors. Flame stabilization is generally caused by causing combustion products to recirculate and continually ignite the fuel mixture. The research focus is here to understand the physics behind flame stability using flow analysis in gas turbine combustors. The goal of this research is to investigate the flame aerodynamics and combustion for a confined and unconfined swirling flow using a novel radial-radial injector at standard atmospheric temperature and pressure using 2D Laser Doppler Velocimetry (LDV). LDV allows for non-contact measurement with high frequency response for both the confined and unconfined case. A novel air blast injector was used for the study since it improves fuel injection unlike standard swirlers. Experimental investigation has been to replicate a LDI combustor scenario but without fuels in order to understand the aerodynamics arising from the interactions of flow fields by swirl motion caused in confined and unconfined case. The experiments are performed by placing the chamber with the counter rotating-radial-radial injector on a horizontally mounted setup which was moved in the vertical direction as well to record data for the three axes (X, Y, Z). The inlet air was preheated to 400 F and the pressure drop across the swirler set to 4% of atmospheric pressure. The goal of this research work is to improve the aerodynamics of flow in a confinement and how the aerodynamics of flame could be enhanced and used to advantage to perform improved combustion as well as to discern the effects of the novel properties of the radial-radial injector. The main advantage of this novel injector was that the surface area of contact between the fuel and air can be increased which leads to better fuel distribution. The swirl vane angle was set at 72° with a flow number of 1.6 and spray angle of 60°. Due to weak laser intensity of the blue light even after setup orientation, S-N frequency was found to be less than 50%, hence 2000 particles were considered as the baseline for data gathering during LDV. The test setup consisted of a swirler mounted in the centre of the aluminium chamber (0,0) in terms of coordinate system. A 2-inch x 2-inch square cross-section plexiglass chamber has been used for flow field confinement. The measurements were conducted in the horizontal plane spanning the width of 52 mm and in the vertical plane up to 28 mm covering the entire spectrum of enclosure to completely describe the flow fields. This study helped to evaluate performance for confined and dome recession effects on the flow fields of novel injector design as well as the unconfined flow fields in which liquid dominance is near center of the region. Flow was confined using plexiglass chamber coupled with flow visualization. The velocity flow fields developed from the swirler in the confined and unconfined varied greatly in terms of the recirculation zone development downstream of swirler and closer to the chamber walls. The unconfined case had a donut shaped CTRZ zone with particle density and velocity contours maximum at the centre and the velocity decreases as moving away from the injector. For the confined case, the CTRZ continues to develop a little away as the plexiglass helps in recirculation flow. The aerodynamic experimental investigation data has been used to discern effects on combustion performance and process recommendations for the LDI combustor design improvements. A key observation from this study is that a confinement can be provide a better balance to improve performance and deal with combustion instabilities. This idea could also help in reducing emission by ensuring the fuel-air mixture particles have a larger CTRZ and more contact surface area for mixing.
San-Mou Jeng, Ph.D. (Committee Chair)
Shaaban Abdallah, Ph.D. (Committee Member)
Milind Jog, Ph.D. (Committee Member)
73 p.
Mechanical Engineering
Swirling Flow; Confined and Unconfined; Flame Stabilization; 2D Laser Doppler Velocimetry

Recommended Citations

Citations

  • Soni, A. (2019). Experimental Investigation of Flame Aerodynamics for Confined and Unconfined Flow for a Novel Radial-Radial Novel Injector using 2D Laser Doppler Velocimetry [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1552656922178471

    APA Style (7th edition)

  • Soni, Abhishek. Experimental Investigation of Flame Aerodynamics for Confined and Unconfined Flow for a Novel Radial-Radial Novel Injector using 2D Laser Doppler Velocimetry. 2019. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1552656922178471.

    MLA Style (8th edition)

  • Soni, Abhishek. "Experimental Investigation of Flame Aerodynamics for Confined and Unconfined Flow for a Novel Radial-Radial Novel Injector using 2D Laser Doppler Velocimetry." Master's thesis, University of Cincinnati, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1552656922178471

    Chicago Manual of Style (17th edition)

ucin1552656922178471
448
© 2019, some rights reserved.Creative Commons License Experimental Investigation of Flame Aerodynamics for Confined and Unconfined Flow for a Novel Radial-Radial Novel Injector using 2D Laser Doppler Velocimetry by Abhishek Soni is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.