By Schneider B.M.

The current paintings is an experimental research of excessive strain Diesel gas sprays injected into inert environments less than evaporating and non evaporating stipulations at excessive gasoline pressures.The effects extra considerably raise present wisdom and knowing of the elemental methods governing the breakup and atomization of those tran┐sient, excessive strain gasoline sprays and symbolize an in depth and strong database for the improvement and trying out of spray types in computational fluid dynamics codes. A extreme temperature and excessive strain consistent quantity mobilephone was once used as experi┐mental equipment. This combustion phone presents a versatile facility to review sprays over quite a lot of environments, together with stipulations present in Diesel engine combustion chambers. it really is outfitted with a simple configurable universal Rail Diesel injection system.Two complementary size innovations the place used: The shadow imaging approach together with applicable snapshot processing permits the measure┐ment of the axial and radial penetration as a functionality of time. It additionally allows the visualization of constructions within the liquid section of the instant spray. The section Doppler Anemometry process (PDA) measures at the same time the ve┐locity and measurement of person droplets at unmarried destinations within the gas spray. Scanning the size element over a grid of destinations within the spray permits the character┐ization of the droplet stream box constitution within the gasoline spray. the subsequent parameter the place diverse within the experiments of this learn: fuel pres┐sure and gasoline temperature, gas injection strain, diameter and size to diameter ratio of the injection nozzle holes (the injector nozzles had constantly one crucial hole). This allowed for experiments with as much as ninety six parameter diversifications. The measurements of the axial gas spray penetration over the big variety of fuel stipulations during this learn exhibit the restrictions of the corresponding versions present in the literature. most significantly, the effect of the gasoline density at the preliminary linear enlargement and the impact of the fuel temperature at the later propagation of the gasoline spray have to be taken into account.Experimental correlations for the gas spray propagation which have been built less than non evaporating stipulations have just a restricted usefulness for the estimation of the gas spray penetration lower than genuine diesel engine stipulations. The section Doppler Anemometry measurements supply for non evaporating stipulations an ordinary droplet diameter of 8μm (), while below evaporat┐ing stipulations the droplet diameters are diminished through part to sizes of 4μm and not more ().The experimental information during this examine couldn't be interpreted properly with out tak┐ing into consideration the constraints of the utilized size suggestions. using complementary size ideas within the similar test enables a neater interpretation of the phenomena present in the size information. it really is proven besides that the producing caliber, i.e. the small adjustments within the micro geometry of the nozzles, can have a much bigger impression at the gasoline spray features than the adaptation of the nozzle gap dimensions itself.

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Die Öffnungszeit des Ventils wird durch Experiment 45 die gewählte Nockendrehzahl festgelegt, die Ventilhebungskurve kann durch den Einbau unterschiedlicher Nocken variiert werden. Für die Erzeugung einer Drallströmung in der Zelle ist auch der Einbau eines Schirmventils möglich. Das Auslassventil (6) nimmt gleichzeitig die Funktion eines Überdruckventils für die Zelle wahr: Der maximal zulässige Zellendruck wird über den Luftdruck im Betätigungszylinder eingestellt. Der Betätigungszylinder ist über kurze Luftleitungen mit schnell schaltenden Ventilen verbunden, was kurze Reaktionszeiten im Fall von Schnellabschaltungen durch die Zellensteuerung ermöglicht.

Der Gasdruck in der Zelle wird mit einem gekühlten piezoelektrischen Druckaufnehmer gemessen. Die Kopplung an den absoluten Druck erfolgt entweder über den piezoresistiven Messaufnehmer im Verbindungsrohr vor dem Einlassventil oder, noch einfacher, über den Umgebungsdruck solange das Auslassventil geöffnet ist. 1 festgelegten Standard-Betriebspunkte. Im Diagramm links ist jeweils der Verlauf eines einzelnen typischen Zyklus aufgezeichnet, das Diagramm rechts davon zeigt die Bandbreite der Druck- und Temperaturverläufe über 50 aufeinander folgende Zyklen.

Zellkörper Einlassventilantrieb Auslassventil Nockenwelle Einspritzdüse KupplungsBremseinheit Kühlwasserverteilung Schwungrad Antriebsmotor Verbindungsrohr Autoklav-Zelle Berstscheibe Autoklav Hauptventil Autoklav Abb. 3: Ansicht der Versuchsanlage. Die Messtechnik für das Experiment und der eigentliche Zellkörper befinden sich hinter dem sichtbaren Anlagenteil. 2 Die Fenster der Zelle Die Fenster und die dazugehörigen Dichtungen müssen die folgenden Anforderungen erfüllen: • Sichere Abdichtung der Kammer bei Gasdrücken von bis zu 100bar (ohne Verbrennung).

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