Part 2: Design Optimisation Strategies for a Fuel Spray Nozzle

Abstract Reducing emissions and improving fuel economy has become a key target for advanced aircraft engine platforms. The competitive aviation market requires a drastic reduction in current aircraft emission levels, which leads to the requirement of optimising the entire combustion process. Lean burn pre-mixed systems are an efficient way of reducing NOx emissions. Starting from a datum blade generated in a companion paper, shape optimisation strategies applied to a fuel spray nozzle have been explored. Making use of three different design space parametrisation methods and several optimisation algorithms, an optimised passage has been generated. The optimised design achieves a considerable pressure loss reduction in comparison to the baseline design.

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Modeling of Electrohydrodynamic Processes within a Charge Injected Fuel Spray Nozzle

International Journal of Fluid Mechanics Research ◽

10.1615/interjfluidmechres.v24.i4-6.340 ◽

1997 ◽

Vol 24 (4-6) ◽

pp. 791-797

Author(s):

Z. Djuric ◽

Wamadeva Balachandran ◽

C. W. Wilson

Keyword(s):

Fuel Spray ◽

Spray Nozzle ◽

A Charge

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Numerical Study on Abrasive Flow of the Fuel Spray Nozzle Based on RNG k-ε Model

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/382/4/042004 ◽

2018 ◽

Vol 382 ◽

pp. 042004

Author(s):

JunYe Li ◽

NingNing Su ◽

GuiLing Wu ◽

WenQing Meng

Keyword(s):

Numerical Study ◽

Fuel Spray ◽

Spray Nozzle

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Analyzing the Interaction of Vortex and Gas–Liquid Interface Dynamics in Fuel Spray Nozzles by Means of Lagrangian-Coherent Structures (2D)

Energies ◽

10.3390/en12132552 ◽

2019 ◽

Vol 12 (13) ◽

pp. 2552

Author(s):

Dauch ◽

Ates ◽

Rapp ◽

Keller ◽

Chaussonnet ◽

...

Keyword(s):

Coherent Structures ◽

Fuel Spray ◽

Nozzle Geometry ◽

Spray Nozzle ◽

Sph Method ◽

Time Resolved ◽

Fuel Flow ◽

Finite Time Lyapunov Exponent ◽

Primary Breakup ◽

Unique Approach

Predictions of the primary breakup of fuel in realistic fuel spray nozzles for aero-enginecombustors by means of the SPH method are presented. Based on simulations in 2D, novel insightsinto the fundamental effects of primary breakup are established by analyzing the dynamics ofLagrangian-coherent structures (LCSs). An in-house visualization and data exploration platformis used in order to retrieve fields of the finite-time Lyapunov exponent (FTLE) derived from theSPH predictions aiming at the identification of time resolved LCSs. The main focus of this paperis demonstrating the suitability of FTLE fields to capture and visualize the interaction between thegas and the fuel flow leading to liquid disintegration. Aiming for a convenient illustration at a highspatial resolution, the analysis is presented based on 2D datasets. However, the method and theconclusions can analoguosly be transferred to 3D. The FTLE fields of modified nozzle geometriesare compared in order to highlight the influence of the nozzle geometry on primary breakup, whichis a novel and unique approach for this industrial application. Modifications of the geometry areproposed which are capable of suppressing the formation of certain LCSs, leading to less fluctuationof the fuel flow emerging from the spray nozzle.

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Principle and Experiment of Electrostatic Circular Sensor on Turbojet Engine

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.401-403.231 ◽

2013 ◽

Vol 401-403 ◽

pp. 231-234

Author(s):

Yu Fu ◽

Hong Fu Zuo ◽

Jing Cai ◽

Jun Qiang Liu

Keyword(s):

Real Time ◽

Early Warning ◽

Carbon Deposition ◽

Condition Based Maintenance ◽

Fuel Spray ◽

Spray Nozzle ◽

Real Time Monitoring ◽

Turbojet Engine

The principle of gas path electrostatic circular sensor was discussed in this paper, in addition, a monitoring experiment with self-made circular sensor was carried out on turbojet engine, and electrostatic signals were collected successfully to verify the validity and feasibility of the sensor. According to the signals monitored over 131h, typical signals of 233-240 phases were analyzed. It was proved that the unusual particles were caused by carbon deposition from fuel spray nozzle. Therefore, under real-time monitoring of gas path changes with electrostatic circular sensor, early warning could be provided for initial fault condition as well as real-time reference for condition-based maintenance.

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