research centers


Search results: Found 3

Listing 1 - 3 of 3
Sort by

Article
The Influence of Injection Timing on Combustion and Emission Characteristics of HSDI Diesel Engine
تأثير توقيت الحقن على خصائص الاحتراق والانبعاثات لمحرك ديزل مباشر الحقن عالي السرعة

Authors: Hayder A. Dhahad --- Mohammed A. Abdulhadi --- Ekhlas M. Alfayydh --- T. Megaritis
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2014 Volume: 32 Issue: 9 Part (A) Engineering Pages: 2216-2234
Publisher: University of Technology الجامعة التكنولوجية

Loading...
Loading...
Abstract

An attempt has been made to study the combustion and emission characteristics of ultra-low diesel fuel for high speed direct injection ( HSDI) diesel engine at different fuel injection timings( -12,-9,-6,-3,0 )ATDC . The fuel injection pressure was 800 bar and at high load ( 80Nm= 5BMAP) , low load ( 40Nm=2.5BMAP ) , With constant engine speed ( 1500rpm) . In-cylinder pressure was measured and then analyzes this pressure using LABVIWE program and calculation program in MATLAB software to extract the apparent heat release rate, the ignition delay, combustion duration and the amount of heat released during the premixed and diffusion combustion phases . The influence of injection timing on the exhaust emissions such as carbon monoxide (CO), total hydrocarbons (THCs), nitric oxides (NOx), smoke number (SN) and fuel consumption were also investigated. A result referring to that the retardation of the injection timing lead to increase the ignition delay and therefore the premixed burn fraction which plays a key role in the combustion and emission characteristics .this leads to change combustion mode to low temperature combustion at late injection timing.

هذاالبحث دراسة لخصائص الاحتراق والانبعاثات لوقود الديزل منخفض الكبريت باستخدام محرك ديزل عالي السرعة وذوحقن مباشر ومع تغييرتوقيت الحقن عند 0,-3,-6,-9,-12 ATDC )) ,ضغط الحقن للوقود كان 800barواجريت التجارب عند الحمل العالي (80Nm=5BMEP) والحمل المنخفض( 40Nm=2.5BMEP), تم تثبيت سرعة المحرك عند 1500 rpm .تم قياس الضغط داخل غرفة الاحتراق ومن ثم تحليل هذا الضغط باستخدام برنامج LABVIWE وبرنامج حسابي باستخدام برنامج MATLAB لحساب معدل الحرارة المنطلقة وتاخر الاشتعال ومدة الاحتراق وكمية الحرارة المنطلقة فيطور الاحتراق المسبق الخلط وكذلك فيطور الاحتراق الانتشاري. تاثير توقيت الحقن على انباعاث الغازات العادم مثل اول اوكسيد الكاربون (CO) الهادر وكابون غير المحترق الكلي (THC) واكاسيد الناتروجين ( NOx) ورقم الدخان (SN) ومعدل استهلاك. النتائج اشارة الى ان تاخير توقيت الحقن يؤدي الى زيادة تاخير الاشتعال وبالتالي زيادة كمية الاحتراق المسبق الخلط والذي يلعب الدور الرئيسي في تحديد خصائص الاحتراق والانبعاثات . وذلك يمكن ان يؤدي الىتغيير طبيعة الاحتراق الى احتراق منخفض درجة الحرارة عندما يكون توقيت الحقن متاخر .


Article
The Influence of Injection pressure on Combustion and Emission Characteristics of a common-rail HSDI Diesel Engine

Authors: Hayder A.Dhahad --- Mohammed A. Abdulhadi --- Ekhlas M.Alfayydh --- T. Megaritis
Journal: Thi-Qar University Journal for Engineering Sciences مجلة جامعة ذي قار للعلوم الهندسية ISSN: 20759746 Year: 2014 Volume: 5 Issue: 1 Pages: 55-72
Publisher: Thi-Qar University جامعة ذي قار

Loading...
Loading...
Abstract

The present work investigates the influence of fuel injection pressure on the combustion and emission characteristics of ultra-low diesel fuel for high speed direct injection ( HSDI) diesel engine at different fuel injection timings( -12,-9,-6,-3,0 )ATDC has been made . The fuel injection pressure were (800,1000,1200) bar and at high load ( 80Nm= 5BMAP) , low load ( 40Nm=2.5BMAP ) , With constant engine speed ( 1500rpm) . In-cylinder pressure was measured and analyzed using LABVIWE program .A calculation program specially written in MATLAB software was used to extract the apparent heat release rate, the ignition delay, combustion duration and specifies the amount of heat released during the premixed and diffusion combustion phases ( premixed burn fraction PMBF) and ( diffusion burn fraction DBF). The influence of injection pressure on the exhaust emissions such as carbon monoxide (CO), total hydrocarbons (THCs), nitric oxides (NOx), smoke number (SN) and fuel consumption were also investigated.A result referring to that when the injection pressure was increased, the ignition delay reduced. A shorter ignition delay at high injection pressure also advanced the combustion, and increased the in-cylinder pressure, heat release rate and their peaks respectively .The premixed burn fraction increased with fuel injection pressure increasing, and this caused a decrease in each of the exhaust SN, THC and CO emissions but the NOx emissions increased.


Article
Effect of Aluminum Oxide Nanoparticles Fuel Additives on the Performance and Emissions of Diesel Engine

Authors: H.A. Dhahad --- A.S. Hamadi --- S.A. Ali
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2017 Volume: 35 Issue: 9 Part (A) Engineering Pages: 956-960
Publisher: University of Technology الجامعة التكنولوجية

Loading...
Loading...
Abstract

The effect of Aluminum Oxide (AL2O3) nanoparticles fuel additives on the performance and emission characteristics of diesel engine was investigates. Diesel fuel was mixed with the (AL2O3) nanoparticles in the mass fractions of 100 and 150 ppm by using ultrasonicator. Direct injection (DI), by using fiat diesel engine that run at fixed speed (1500 rpm) and constant fuel injection pressure (400 bar) with varying the operation load. The gain result was likening with those obtain when the operation the diesel engine with normal fuel. Measurements indicated that there is enhancement in the thermal efficiency and the brake specific fuel consumption with increasing the dosing level of (AL2O3) nanoparticles in the blended fuel. The emission results at all loads showed that NOx and smoke produced by (AL2O3) blended fuels were less than those produced by diesel fuel. Diesel fuel produced CO and HC more than (AL2O3) blended fuels at high load and less at low load.

Listing 1 - 3 of 3
Sort by
Narrow your search

Resource type

article (3)


Language

English (3)


Year
From To Submit

2017 (1)

2014 (2)