Computation of Liquid Fuel Atomization and Mixing by Means of the SPH Method: Application to a Jet Engine Fuel Nozzle

Abstract

At the “Institut für Thermische Strömungsmaschinen” (ITS) a numerical method based on the the meshfree “Smoothed Particle Hydrodynamics” (SPH) approach has been developed with the objective of computing primary breakup in the vicinity of fuel spray nozzles [1, 2]. In recent publications the successful application of the code to different flow problems is demonstrated [3, 4]. In this paper we present the first application of the method to investigate a simplified, but applied fuel spray nozzle geometry of the swirl cup design in 2D. The atomization process of Jet-A1 at ambient and at high pressure conditions is compared in terms of film flow development, mixing and spray characteristics. The influence of pressure is pointed out and quantified. The study demonstrates that the SPH method is a suitable toolbox for the analysis and the design of fuel spray nozzles. Unique analysis tools that are not available in grid-based CFD methods are presented and applied. Droplet distributions are extracted, which can be considered as possible input in subsequent Euler-Lagrange computations.

Smoothed Particle Hydrodynamics Simulation of an Air-Assisted Atomizer Operating at High Pressure: Influence of Non-Newtonian Effects

“…Braun and coworkers applied the SPH method to a droplet in a sheared flow [9] and to a generic planar prefilming airblast atomizer [10] where it was shown that the method retrieves the proper behavior of the liquid fragmentation. Dauch et al [11] investigated a realistic annular prefilming airblast atomizer and demonstrated the suitability of the SPH method in complex industrial configuration. Finally, Chaussonnet et al [12] investigated the air-assisted atomization of a viscous liquid at atmospheric pressure in a geometry similar to the one of the present study.…”

Computational Prediction of Primary Breakup in Fuel Spray Nozzles for Aero-Engine Combustors

“…Conventional grid based methods exhibit a variety of inherent shortcomings, which can be overcome by a fully Lagrangian approach. In recent publications the potential of the code in terms of two-phase flow predictions has been demonstrated successfully by Braun et al, Dauch et al and Keller et al [1,3,6]. Current state-of-the art methods for combustor design do not take into account the details of primary breakup.…”

“…As grid based methods exhibit a variety of disadvantages when it comes to the prediction of multiphase flows, the "Smoothed Particle Hydrodynamics" (SPH)-method is employed. The eligibility of the method to analyze breakup of fuel has been demonstrated in recent publications by Braun et al, Dauch et al and Koch et al [1,2,3,4]. In the current paper a methodology for the investigation of the two-phase flow in the vicinity of fuel spray nozzles at typical operating conditions is proposed.…”

“…Then the corresponding centrifugal forces can be assigned. The model is presented previously by the author in [3].…”

Numerical Simulation of Cavitation in a Nozzle and Liquid Jet Using Moving Particle Semi-implicit Method

“…など） 、 粒子法を用いた研究例は少ないという印象を受 ける。SPH（Smoothed Particle Hydrodynamics）法 [8,9]では Dauch et al [10]の研究が、MPS（Moving Particle Semi-implicit）法 [11]では Duan et al [12]、 Ishii et al [13]、Sun et al [14]、Yasukawa et al [15] の研究が、例として挙げられる。 ノズル内キャビテーション解析や噴霧解析に 混相流 …”