دانلود ترجمه مقاله تاخیر در خود اشتعالی نفت سفید آیروسل و مخلوط آن با مطالعه شوک لوله – مجله الزویر

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 چکیده
۱ مقدمه
۲ کار تجربی
۳ نتایج و بحث
۴ ملاحظات پایانی

• بخشی از ترجمه:

۱-لوله شوك آيروسل با اتصال به پيستون براي پركردن آيروسل توسعه يافته است. آيروسل قبلا مخلوط شده و اندازه دانه اي در حدود ۳μm دارد.
۲-تاخير اشتعال نفت سفيد، مخلوط تجزيه شده در لوله هاي شوك بدست امده است. اين مخلوط هوا است و همچنين مخلوطي از سوخت و اكسيژن و آرگون مي باشدذ.
۳-تاخير در احتراق وابسته به فشار و نسبت هم ارزي بدست امده به طوري كه مقايسه مي تواند براي داده هاي مختلف از قبيل فشار ، نسبت تعادل، اندازه شوك، در شرايط آزمون هاي مختلف بدست آيد.

• بخشی از مقاله انگلیسی:

. Introduction For combustion studies of scramjet and detonation, ignition delay of kerosene and its cracked mixture are important for combustor design. Also, in calibration of fuel chemistry elementary reaction models, ignition delay is used to judge chain reaction steps. Usually, shock tube is almost a unique facility to obtain delay of auto-ignition. In fact, industrial fuels are almost liquid, so, how to get liquid fuel ignition delay in shock tubes is still a challenge topic at present. Davison and Hanson[1] used ultrasonic nebulizer to produce kerosene aerosol in mixture of Argon and oxygen and got ignition delay for liquid fuels. Hydraulic assembly connected to shock tube end is used to inlet aerosol. In this paper, premixed kerosene aerosol in air mixture is formed outside shock tube and an aerosol shock tube is developed with piston assembly at reflection end for aerosol inlet. A tube with large inner and bend diameters are used to avoid droplets adsorption collision to tube walls during filling. In this shock tube, kerosene and its cracked mixture[2]are studied for obtaining ignition delay. 2.Experiments Fig 1 presents a schematic of set-up for aerosol forming. Tank is vaccumed and kerosene is sucked by a fuel nozzle at diameter 0.3mm in throat of Laval nozzle with constant throat. Air is inlet from a gas bottle at specified pressure by a regular meter. Equivalent ratio is predetermined by air mass in tank and metered volume of kerosene. Fig 2 shows schematic of gas distributor for shock tube. Sections of high pressure(1), low pressure(3) and diaphragm(2) are conventional. But piston setup is attached to reflection end. Fig 3 presents picture and schematic of piston setup. When aerosol is filled into low pressure section, piston is opened and entered aerosol is vaccumed initially so that inner tube walls can be wetted. Then, piston is closed and aerosol filling is finished at specified pressure. By Mie scattering, SMD of droplet is ranged from 3μm to 4.5μm at tank pressure from 0.14MPa to 1.8MPa(Fig 4). No kerosene is condensed on quartz windows in shock tube test section due to low pressure. Fig 5 shows how to determine ignition delay by signal time histories of pressure gas and photomultiplier(PMT). Dispersed burning zones occur randomly in test section at low temperature. Therefore, it is difficult to determine auto-ignition delay because of several peaks of light signal(Fig 6). In our experiments, we neglect such paradox conditions and minimum temperature is found when unique peak appears in PMT signal(fig 5). ۳ Results and Discussions Fig 7 and Fig 8 present ignition delay at different temperature and pressure. In Fig 7, ignition delays are in agreement with precious data but different at low temperature. Ignition delay is obtained in shock tube with heat tape in low pressure section. Complex decomposition and fractionation possibly occur while heating. In Fig 8, ignition delay is decreased when pressure is increased for the same temperature.