نتایج جستجو برای: lean burn

تعداد نتایج: 41655  

2014
K. Kumaravel C. G. Saravanan B. Prem Anand K. Anusha

In order to analyze the effect of hydrogen rich gas addition (HRG) on lean burn engine’s thermal efficiency and emission, an experimental research was conducted on a gasoline direct injection (GDI) engine using definite fraction of HRG. The results showed that HRG addition could significantly extend the lean operation limit, improve the engine’s lean burn ability, and decrease burn duration. HR...

A. Shafiei Sabet, O. Samimi Abianeh, S.M. Mirsalim,

Gas motion within the cylinder is one of the major factors that control the combustion process in spark ignition engine. It also has significant impact on heat transfer. Both the bulk gas motion and the turbulence characteristics of the flow are important and governing the overall behavior of the flow. An arrangement for obtaining a stratified charge, using port injection, is proposed for a ...

Journal: :تحقیقات موتور 0
امید صمیمی ابیانه o. samimi abianeh سید مصطفی میرسلیم s.m. mirsalim احمد شفیعی ثابت a. shafiei sabet

gas motion within the cylinder is one of the major factors that control the combustion process in spark ignition engine. it also has significant impact on heat transfer. both the bulk gas motion and the turbulence characteristics of the flow are important and governing the overall behavior of the flow. an arrangement for obtaining a stratified charge, using port injection, is proposed for a cur...

E. Abdi Aghdam F. Sadegh Moghanlou S. K. Yekani

Considering the disadvantages of gasoline and natural gas as mono-fuel in SI engines has made the researchers to improve the performance and reduce the pollutant as the advantages of the application of dual fuel engines. On the other hand, lean-burn in engine may lead to the reduced pollutant. In the present study various mixtures of gasoline and natural gas with the gasoline as the dominant fu...

2011
R. Sharma P. Dennis C. Manzie M. J. Brear

Idle speed control of ultra-lean burn engines continues to be a major focus of automotive engineers owing to the benefits offered in terms of fuel economy and emissions reduction. This paper applies a recently proposed linear time varying model predictive approach for the idle speed control of ultra-lean burn internal combustion engines. Unlike conventional gasoline engines, the approach uses f...

Journal: :Exercise and sport sciences reviews 2015
Craig Porter Justin P Hardee David N Herndon Oscar E Suman

Severe burn trauma results in persistent skeletal muscle catabolism and prolonged immobilization. We hypothesize that structured rehabilitative exercise is a safe and efficacious strategy to restore lean body mass and physical function in burn victims. Here, we review the evidence for the utility of rehabilitative exercise training in restoring physiological function in burn survivors.

2008
Chundi Cao Ja Hun Kwak Charles H. F. Peden János Szanyi

Introduction Current and upcoming environmental policy in the developed countries is imposing significant decreases in NOX emissions from combustion processes such as vehicle engines. Traditional three-way catalysts are ineffective under O2 rich atmosphere lean-burn engines operate under. Lean NOx trap (LNT) technology developed for treating lean automotive exhaust emission is considered one of...

Journal: :Flow, turbulence and combustion 2021

Ultra-lean burn conditions (? > 1.8) is seen as a way for improving efficiency and reducing emissions of spark-ignition engines. It raises fundamental issues in terms combustion physics its modeling, among which the significant reduction laminar flame speeds increase thickness, well an increased sensitivity to local fuel/air equivalence ratio variations are essential be accounted compared conve...

2007
Feng Zhang Karolos M. Grigoriadis Matthew A. Franchek Imad H. Makki

Maximization of the fuel economy of the lean burn spark ignition (SI) engine strongly depends on precise air-fuel ratio control. A great challenge associated with the air-fuel ratio feedback control is the large variable time delay in the exhaust system. In this paper, a systematic development of an air-fuel ratio controller based on post lean NOx trap (LNT) oxygen sensor feedback using linear ...

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