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Двигатели Стирлинга

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Архивы рубрики: Fuel Systems for IC Engines

Effect of viscosity, temperature and nozzle length-to-diameter ratio on internal flow and cavitation in a multi-hole injector

J M Nouri, S Mackenzie, C Gaskell, A Dhunput Transport and Energy Research Centre School of Engineering and Mathematical Sciences City University London, UK ABSTRACT Two 3-D six-hole transparent enlarged model injector have been manufactured with full optical access; both were 15 times larger than the real size, but one had a length-to-diameter ratio twice

CONCLUSION

The study shows the dominant influence of the liquid fuel viscosity on the jet disintegration and spray formation. A reduced viscosity (or increased Reynolds number) enhances turbulence in the nozzle and leads to a slim microscopic spray with reduced spray width but increased bending of the jet towards the injector axis. The same trend was

Investigations at low ambient pressure for a 3-hole injector

In general, the investigated 3-hole injector is characterized by a rapid atomization which is preferable for a fast mixture formation [3]. However, an unsteady spray behaviour and spray fluctuations were observed leading to strong jet-to-jet interactions, see Figure 3. There, exemplary single shot images are given for atmospheric chamber pressure. For low back-pressure the jet

Reynolds Number effects on atomization and cyclic spray fluctuations under gasoline direct injection conditions

L Zigan, I Schmitz, M Wensing, A Leipertz Lehrstuhl fьr Technische Thermodynamik, Universitдt Erlangen-Nьrnberg and Erlangen Graduate School in Advanced Optical Technologies (SAOT), Universitдt Erlangen-Nьrnberg, Germany ABSTRACT This paper provides a brief overview of recent experimental studies regarding fuel property effects on the liquid jet disintegration and droplet breakup for gasoline direct injection. Microscopic and

ASSESSMENT OF DOWNSIZING AND LEAN-BURN COMBUSTION IN THE MODERN TECHNOLOGY TOOLSET

As outlined above, lean-burn stratified combustion combined with turbocharging offers large gains in efficiency, while at the same time ensuring minimal particulate emissions. However, the enormous technical advantages are associated with a substantial cost penalty when compared with other conventional technologies. Piezo injectors are somewhat more costly than solenoid injectors, and with lean-burn combustion, a

COMBINATION OF LEAN-BURN COMBUSTION PROCESS WITH TURBOCHARGING

A recurring topic of discussion is the combination of lean-burn combustion and downsizing [5, 6]. Obviously, the use of lean-burn combustion in large displacement engines significantly reduces gas exchange losses at low load operation. Downsizing also minimizes throttling losses as a result of load point shifts. Subsequently, both efficiency improvements from lean burn combustion and

FUEL INJECTION SYSTEM REQUIREMENTS FOR THE SPRAY-GUIDED COMBUSTION

The spray-guided combustion requires two key features from the injector. Mixture formation is based primarily on the interaction of spray and air flow; there is no spray-wall interaction. An extremely precise and stable formation of the spray throughout the service life is therefore crucial. Also, multiple injections are used frequently. This is necessary in order

KEY ELEMENTS FOR CO2 REDUCTION AT DAIMLER

Mercedes-Benz is pursuing a strategy of systematic CO2 reduction based on three pillars. The first is the continued improvement of the existing combustion engines. The second involves the hybridization of the conventional powertrain. The third and final step is the complete electrification of the powertrain using fuel cells or batteries. The first two pillars are

HISTORICAL REVIEW AND INTRODUCTION

Top priority for the development of modern gasoline engines is fuel economy. Several technologies are feasible: downsizing combined with turbocharging, direct injection with stratification, de-throttling by means of variable valve control, minimizing frictional loss, energy management or start/stop technologies. Downsizing and direct injection have a long tradition in the Mercedes-Benz engine development. A well known

Fuel economy and emission potential of spray-guided combustion in gasoline engines

H Breitbach, P Lьckert, A Waltner, J Bieler Daimler AG, Germany ABSTRACT In 2006, Mercedes-Benz introduced a spray-guided lean-burn stratified combustion system for gasoline engines in the M272 DE six-cylinder engine due to its exceptional fuel economy. To enable this combustion system, a new type of injector with outwardly opening needle was used, producing a