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Двигатели Стирлинга

Сайт о двигателях Роберта Стирлинга. История, описание, конфигурация, принцип работы... А также о других двигателях, тепловых машинах, двигателях внешнего и внутреннего сгорания, новинках в машиностроении. More »

Двигатели Стирлинга

Сайт о двигателях Роберта Стирлинга. История, описание, конфигурация, принцип работы... А также о других двигателях, тепловых машинах, двигателях внешнего и внутреннего сгорания, новинках в машиностроении. More »

Двигатели Стирлинга

Сайт о двигателях Роберта Стирлинга. История, описание, конфигурация, принцип работы... А также о других двигателях, тепловых машинах, двигателях внешнего и внутреннего сгорания, новинках в машиностроении. More »

 

Архивы рубрики: Fuel Systems for IC Engines

Virtual erosion prediction, design optimization and combustion system integration of high pressure fuel injector systems

M Gouda, D Greif, M Suffa, E Winklhofer, D Gill AVL List GmbH, Austria V Srinivasan AVL Powertrain Engineering Inc., USA INTRODUCTION The desire for environmental friendly diesel powertrain systems, driven by consumers’ expectations and emission legislations, is the motor of the current revolution in green diesel mobility. While diesel aftertreatment systems could contribute significantly

Real-Size Transparent Nozzle Tip

Following the investigations of internal flow and its effects on emerging spray shape stability in enlarged transparent nozzle replicas, the need to confirm the existence of the observed structures in real-size nozzles has become a necessity. A selected, generic VCO nozzle has been converted to accommodate a transparent nozzle tip that allows for direct optical

Large-Scale Prototype Nozzle Design

The authors’ research group has conceived and tested a new nozzle design that eliminates the aforementioned vortex flow at the hole entry by isolating each hole’s flow path. Elimination of vortex flow has been proved to affect considerably, and ultimately eliminate, vortex cavitation structures. As presented in the following Figure 5, geometric cavitation structures formed

Large-Scale VCO Nozzle Study

The study of the VCO nozzle geometry includes various operating conditions: low and full needle lift cases, low and high cavitation numbers, as well as a variety of flow rates through the nozzle are included. Since the nozzle features sharp hole inlet, a fair amount of geometric-induced cavitation is present inside the injection hole; consequently,

RESULTS AND DISCUSSION

In this section the various results are presented and discussed, starting with those obtained from the combined investigation of internal nozzle flow and sprays generated by the VCO nozzle. Those include images of in-hole cavitation structures, focused particularly on string cavitation, as well as the emerging spray shape for several operating conditions including various needle

Real-Size Transparent Tip Test-Rig

Investigations of the internal nozzle flow and cavitation formation inside real-size nozzles operating under realistic transient injection conditions can be achieved by replacing the nozzle tip with an exact real-size transparent tip cap replica. This technique has been developed and presented thoroughly in [21, 22]. The experimental set-up used to capture the effect of cavitation

EXPERIMENTAL SET-UP

The results presented in following sections have been obtained in both, enlarged and real-size transparent nozzle models. Figure 1 illustrates the two basic nozzles where the studies reported here are based on. Figure 1: Investigated nozzle geometries. (a) VCO and (b) new concept nozzle design with a 6-hole configuration. (a) (b) All transparent nozzles (large-scale

Spray Stability from VCO and a new Diesel nozzle design concept

N Mitroglou, M Gavaises, D Arcoumanis School of Engineering and Mathematical Sciences City University London, UK ABSTRACT Cavitation structures developing within the injection holes of high-pressure Diesel injectors are known to affect the emerging spray shape and its stability. The present study attempts to link the development of these cavitation structures to the near-nozzle spray

RESULTS AND DISCUSSION

First a comparison is made between different types of cavitation observed in the first model M1 and those observed by [9] in a similar geometrical model but with a scale twice as big as M1. Then the cavitation formation and development in models M1 and M2 are discussed at different needle lifts and flow rates.

EXPERIMENTAL SET UP AND INSTRUMENTATIONS

Large-Scale Injector with Needle Lift Mechanism Figure 1: The closed loop steady-state flow rig of the transparent large-scale injector: (a) schematic diagram of flow circuit; (b) photograph of the experimental set up. The experimental rig shown in figure 1 is the same as that used in [3] and here a brief description of the setup