Using momentum flux measurements to determine the injection rate of a commercial Urea Water Solution injector

This research introduces a novel wall-stress model called the Spray-Induced Wall Stress (SIWS) model, which considers the effects of spray-wall impingement and the resulting formation of wall stress within the Lagrangian spray modeling framework. The primary objective of this paper is to provide a mathematical description of the fundamental physics underlying the model. Subsequently, the proposed model is validated using existing experimental data. The remainder of the study focuses on the practical application of the model to an ignition assistance device. Specifically, this device is installed in a compression ignition engine and designed to enhance ignition in aviation-fueled high-altitude aircraft propulsion systems. The research sheds light on the mechanical impulse caused by the high-speed impact of the spray jet, leading to the accumulation of mechanical stress on the rigid body of the ignition assistance device. Previous studies on fluid–structure interaction have only considered the interaction between the gas phase and the solid wall. However, the SIWS model incorporates the additional impact of the impinging liquid spray jet. Consequently, the simulated stress distribution on the ignition assistance device can be estimated by considering both the gas-phase-induced term and the spray-induced term simultaneously.

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Effects of Injection Sequences on Spray Characteristics of an Air-Assisted Atomizer for Two-Stroke Aviation Engines

Zheng

Liu

et al. 2023

Journal of Energy Resources Technology

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The air-assisted atomizer used in a two-stroke aviation engine has two separate operation sequences, namely the fuel injection and air injection, in contrast to the synchronous fuel/air injection of conventional effervescent atomizers for continuous combustion engines. This work presents a numerical flow modeling to explore the effects of these two injection sequences on the effervescent spray formation, using the combined methodology of Eulerian-Eulerian multiphase technique and SST k-ω turbulence model. The transient fuel delivery in the internal fuel passage of the atomizer and the effects of the injection sequences on the developments of the droplet sprays were studied. Three characteristic times T1, T2 and T3, were introduced to specify the fuel injection duration, air injection duration, and the time interval between these two injection sequences respectively. The results showed that the most important role of T1 is to meter fuel mass loading, and T2 plays the dominant role on anchor-shaped spray structure. For the air injection sequence, there is a critical time, T3c, which is defined as the minimum opening time of the air injector, for the complete ejection of the fuel in the atomizer, shows a linear correlation to T2, but is weakly related to T1.

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Using momentum flux measurements to determine the injection rate of a commercial Urea Water Solution injector

Cited by 4 publications

References 31 publications

A conceptual model of polyoxymethylene dimethyl ether 3 (PODE3) spray combustion under compression ignition engine-like conditions

A conceptual model of polyoxymethylene dimethyl ether 3 (PODE3) spray combustion under compression ignition engine-like conditions

Modeling of the spray-induced wall stress acting on the ignition assistance device

Effects of Injection Sequences on Spray Characteristics of an Air-Assisted Atomizer for Two-Stroke Aviation Engines

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