The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON FLUID MECHANICS
Transactions ID Number: 32-798
Full Name: Taib Iskandar Mohamad
Position: Senior Lecturer
Age: ON
Sex: Male
Address: Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor
Country: MALAYSIA
Tel: +60 3 89216967
Tel prefix:
Fax: +60 3 89259659
E-mail address: taib@eng.ukm.my
Other E-mails: taib7767@gmail.com
Title of the Paper: Gas Jet Characteristics from Spark Plug Fuel Injector for CNG Direct Injection Spark Ignition Engine
Authors as they appear in the Paper: Taib I. Mohamad
Email addresses of all the authors:
Number of paper pages: 10
Abstract: This paper discusses some of the characteristics of gas jets emerging from a newly developed device known as Spark Plug Fuel Injection (SPFI). SPFI is a combination of a fuel injector and a spark plug that was developed with the aim to convert any port injection spark ignition engine to compressed natural gas (CNG) direct injection [9]. A direct fuel injector is combined with a spark plug using specially fabricated bracket connected to a fuel pipe and a fuel path is drawn along periphery of a spark plug body to deliver the injected fuel to the combustion chamber. Gaseous fuel is injected in the fuel path, partially expanded and travelled in a tight path before exiting the SPFI nozzle. The injection nozzle of SPFI is significantly larger than the orifice of the injector. Therefore, investigating the effects of such configuration on the gas jet characteristics is important. Planar laser-induced fluorescent (PLIF) technique was used to visualize the injection process !
with acetone as flow tracer. Nitrogen was used as methane substitute for safety and close proximity of properties. Nitrogen at 50, 60 and 80 bar pressure were seeded with acetone and injected into a bomb containing pressurised nitrogen at 1 and 3 bar. This was done to simulate the pressure inside engine's combustion chamber during the compression stroke where actual injections in engine experiments took place. The shape of gas plume and the depth of jet penetration were measured. Results show that the gas jet follows the behaviour suggested by vortex ball model [1, 12]. The cone angles of the fully developed gas jets are 23o in all cases. The maximum jet width was determined by the jet penetration lengths and was found to vary between 23 and 25 mm. The penetration lengths of the fully developed jets are between 90 and 100 mm at 8 to 14 milliseconds after the start of injections depending on the bomb and injection pressures. Jet penetration length is directly proportional t!
o the injection pressure but inversely proportional to the cylinder or
bomb pressure. The penetration lengths indicate that sufficient distance would be travelled by the gas jet for air-fuel mixing in the engine during experiment.
Keywords: air-fuel mixing, direct fuel injection, flow visualization, gaseous fuel
EXTENSION of the file: .pdf
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How Did you learn about congress: Perpustakaan Tun Seri Lanang, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia. Email: kpustaka@ukm.my
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