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:: Volume 69, Issue 69 (Winter 2023 2022) ::
Vol.69 No. 69 pp. 39-48 Back to browse issues page
Study of GDI injector in constant volume chamber by optical measurements and CFD-Simulation
A. Asef, Arash Mohammadi, Vahid Khorramirad, Nima Ajami, Amir Hossein Parivar, Karim Maghsoudi Mehraban
Abstract:   (486 Views)
Better performance and the regulatory requirements concerning combustion emissions have caused downsized GDI engines and consideration of strategies for improving in-cylinder mixture preparation. The sprays characteristics of the fuel injectors of GDI engines have been widely investigated by researchers. The interest in studying the characteristics of the spray is due to a strong relationship with the subsequent combustion reaction and thus with the engine's thermal efficiency. This paper analyzes the mixture formation of the spray employing an experimental laser apparatus that was used to measure the spray penetration in a constant volume chamber (CVC) and simulations performed by the fast response CFD CONVERGE software. The fuel injector used in the tests was a six-hole direct injection injector with iso-octane fuel. The measurements were taken 100 mm downstream from the injector tip along the axis with 20 MPa injection pressure. During experiments, it was observed that spray development is not symmetrical with the vertical axis, and with decreasing chamber pressure, it develops faster. Moreover, the average spray development velocities in simulations are in good agreement with experimental results.
Article number: 5
Keywords: GDI, Injector, optical, CFD
Full-Text [PDF 1286 kb]   (150 Downloads)    
Type of Study: Research Study | Subject: Engine and Environment
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Asef A, Mohammadi A, Khorramirad V, Ajami N, Parivar A H, Maghsoudi Mehraban K. Study of GDI injector in constant volume chamber by optical measurements and CFD-Simulation. JER 2022; 69 (69) :39-48
URL: http://engineresearch.ir/article-1-850-en.html


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Volume 69, Issue 69 (Winter 2023 2022) Back to browse issues page
فصلنامه تحقیقات موتور The Journal of Engine Research
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