Breakup Mechanism of a Jet in the L-Shape Crossflow of a Gas Turbine Combustor
Experimental investigations are conducted to determine the mechanism and characteristics of a jet in an L-shape crossflow simulating the radial swirl injector of a lean premixed-prevaporized (LPP) combustor. To simplify the radial flow of the actual injector while ignoring the centrifugal effect, th...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-05-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/15/9/3360 |
| _version_ | 1797504888520835072 |
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| author | Myeung Hwan Choi Jeongwoo An Jaye Koo |
| author_facet | Myeung Hwan Choi Jeongwoo An Jaye Koo |
| author_sort | Myeung Hwan Choi |
| collection | DOAJ |
| description | Experimental investigations are conducted to determine the mechanism and characteristics of a jet in an L-shape crossflow simulating the radial swirl injector of a lean premixed-prevaporized (LPP) combustor. To simplify the radial flow of the actual injector while ignoring the centrifugal effect, the L-shaped 2D-channel is used for the crossflow, and water is used as a fuel simulant. The jet breakup is captured using a high-speed camera, and the density gradient magnitude is post-processed to clarify the spray. The Sauter mean diameter (SMD) of the spray is measured via a laser diffraction method with a helium–neon laser optical system (HELOS). The characteristics of the jet in the L-shape crossflow are compared with the characteristics of the jet in a typical crossflow through the flat channel. The results for different outlet heights of the L-shape channel (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>H</mi><mo>/</mo><msub><mi>d</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula>) and different injector positions (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>L</mi><mo>/</mo><msub><mi>d</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula>) are presented. A dimensionless number (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>τ</mi></semantics></math></inline-formula>) consisting of a time ratio is introduced to describe the jet characteristics. In a previous work, the spraying tendency was demonstrated for different injector positions. In addition, the effect of the recirculation area on <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>H</mi><mo>/</mo><msub><mi>d</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula> was empirically shown. <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>H</mi><mo>/</mo><msub><mi>d</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula> determines the size of the recirculation area, and the range of τ determines the jet breakup mechanism inside the L-shape channel. The results of this study present the breakup mechanism of the jet in the L-shape channel flow, which simulates a jet in a radial swirler injector for gas turbine engines. It is expected that these results can be used to assist in designing gas turbine engines with more combustion efficiency. |
| first_indexed | 2024-03-10T04:10:48Z |
| format | Article |
| id | doaj.art-16642f1546ff43269609d9371ddba6e5 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T04:10:48Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-16642f1546ff43269609d9371ddba6e52023-11-23T08:10:17ZengMDPI AGEnergies1996-10732022-05-01159336010.3390/en15093360Breakup Mechanism of a Jet in the L-Shape Crossflow of a Gas Turbine CombustorMyeung Hwan Choi0Jeongwoo An1Jaye Koo2Graduate School, Korea Aerospace University, Goyang 10540, KoreaDepartment of Smart Air Mobility, Korea Aerospace University, Goyang 10540, KoreaSchool of Aerospace Mechanical Engineering, Korea Aerospace University, Goyang 10540, KoreaExperimental investigations are conducted to determine the mechanism and characteristics of a jet in an L-shape crossflow simulating the radial swirl injector of a lean premixed-prevaporized (LPP) combustor. To simplify the radial flow of the actual injector while ignoring the centrifugal effect, the L-shaped 2D-channel is used for the crossflow, and water is used as a fuel simulant. The jet breakup is captured using a high-speed camera, and the density gradient magnitude is post-processed to clarify the spray. The Sauter mean diameter (SMD) of the spray is measured via a laser diffraction method with a helium–neon laser optical system (HELOS). The characteristics of the jet in the L-shape crossflow are compared with the characteristics of the jet in a typical crossflow through the flat channel. The results for different outlet heights of the L-shape channel (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>H</mi><mo>/</mo><msub><mi>d</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula>) and different injector positions (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>L</mi><mo>/</mo><msub><mi>d</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula>) are presented. A dimensionless number (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>τ</mi></semantics></math></inline-formula>) consisting of a time ratio is introduced to describe the jet characteristics. In a previous work, the spraying tendency was demonstrated for different injector positions. In addition, the effect of the recirculation area on <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>H</mi><mo>/</mo><msub><mi>d</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula> was empirically shown. <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>H</mi><mo>/</mo><msub><mi>d</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula> determines the size of the recirculation area, and the range of τ determines the jet breakup mechanism inside the L-shape channel. The results of this study present the breakup mechanism of the jet in the L-shape channel flow, which simulates a jet in a radial swirler injector for gas turbine engines. It is expected that these results can be used to assist in designing gas turbine engines with more combustion efficiency.https://www.mdpi.com/1996-1073/15/9/3360jet in crossflowatomizationbreakupradial swirlerSauter mean diameterspray |
| spellingShingle | Myeung Hwan Choi Jeongwoo An Jaye Koo Breakup Mechanism of a Jet in the L-Shape Crossflow of a Gas Turbine Combustor Energies jet in crossflow atomization breakup radial swirler Sauter mean diameter spray |
| title | Breakup Mechanism of a Jet in the L-Shape Crossflow of a Gas Turbine Combustor |
| title_full | Breakup Mechanism of a Jet in the L-Shape Crossflow of a Gas Turbine Combustor |
| title_fullStr | Breakup Mechanism of a Jet in the L-Shape Crossflow of a Gas Turbine Combustor |
| title_full_unstemmed | Breakup Mechanism of a Jet in the L-Shape Crossflow of a Gas Turbine Combustor |
| title_short | Breakup Mechanism of a Jet in the L-Shape Crossflow of a Gas Turbine Combustor |
| title_sort | breakup mechanism of a jet in the l shape crossflow of a gas turbine combustor |
| topic | jet in crossflow atomization breakup radial swirler Sauter mean diameter spray |
| url | https://www.mdpi.com/1996-1073/15/9/3360 |
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